From 0f07b111a2c72d46271fb315c2ced719df6c9116 Mon Sep 17 00:00:00 2001 From: realmyang Date: Fri, 2 Oct 2026 20:10:15 +0200 Subject: [PATCH 01/16] Viewer M3 step 12: host side of the review walk; Escape stops at the page openLocation takes seq, requestId, walk and highlight. The host drops an open whose seq is not above the last one the page sent, or that a later open overtook, and answers a request id with an actionResult: done, blocked (reason and a short message), cancelled or failed. A changed, missing or otherwise stale file is never opened; a blocked walk open raises no notification, while Enter, double-click and Open links keep theirs. A new walk end message clears the cited-range highlight and its overview-ruler mark, as disposing the panel does. The check behind a jump is cached per revision and freshness, keyed by the cited file's stat, so a walk through one notebook hashes it once instead of on every jump. Escape: VS Code's webview host forwards every keydown to the workbench, even one the page handled, so a viewer Escape also ran workbench Escape commands (it hid a visible notification, measured live). The bootstrap now stops a handled Escape at the document after the mount, the search box marks its Escape handled, and an Escape with nothing left to dismiss is left unconsumed so VS Code can use it. Co-Authored-By: Claude Opus 5.5 --- vscode-extension/media/mlview.js | 4 +- vscode-extension/src/authoredPanel.ts | 290 ++++++++++++++++----- vscode-extension/src/authoredSupport.ts | 27 ++ vscode-extension/src/testEntry.ts | 2 +- vscode-extension/test/bootstrap.test.js | 32 ++- vscode-extension/test/walk-host.test.js | 285 ++++++++++++++++++++ webview/dist/mlview.js | 4 +- webview/src/types.ts | 33 ++- webview/src/ui/appkeys.ts | 14 +- webview/src/ui/commands.ts | 4 +- webview/src/ui/keymap.ts | 9 +- webview/src/ui/searchcontroller.ts | 2 + webview/test/authored-handshake.mjs | 70 ++++- webview/test/authored-integration.test.mjs | 6 +- 14 files changed, 689 insertions(+), 93 deletions(-) create mode 100644 vscode-extension/test/walk-host.test.js diff --git a/vscode-extension/media/mlview.js b/vscode-extension/media/mlview.js index f79d6be9..5f119be4 100644 --- a/vscode-extension/media/mlview.js +++ b/vscode-extension/media/mlview.js @@ -3,7 +3,7 @@ `);return{text:r,title:d}}function Ui(t,e){if(!t)return null;let n=ld(t,e);if(n)return{state:"stale",text:n.text,title:n.title};if(!t.verification)return{state:"unverified",text:"Freshness not checked",title:"This revision was published without source hashes, so MLView cannot tell whether the cited files changed since."};let o=new Set((t.evidence||[]).map(i=>i.file)).size;return{state:"unchanged",text:o+(o===1?" cited file unchanged":" cited files unchanged"),title:"The "+(o===1?"file":o+" files")+" the quotes cite still match the hashes published with revision "+t.revision.id+". 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s.edgeIds)for(let[a,d]of n.edgeEls())(d.getAttribute("data-edge-ids")||a).split(" ").indexOf(l)>=0&&d.classList.add("is-selected");Ml(n.connectors,o,i,n.collapsed(),s)}hoverIntent(e){if(this.hoverTimer!==null){if(this.pendingHover===e)return;clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null}if(this.hoverId===e)return;let n=e?400:120;if(n<=0){this.setHover(e);return}this.pendingHover=e,this.hoverTimer=setTimeout(()=>{this.hoverTimer=null,this.pendingHover=null,this.setHover(e)},n)}setHover(e){if(this.hoverId===e||(this.hoverId=e,this.focusLocked))return;let n=this.ctx;if(!e){this.trace(null,"is-tracing","direct"),n.tooltip.hide(),n.flow.stop(),n.syncBundles();return}this.trace(e,"is-tracing","direct"),n.flow.stream(e,"direct"),n.syncBundles();let o=n.index(),i=n.frame();if(!o||!i)return;let s=i.boxes.get(e);s&&n.tooltip.showNode(o,e,s,r=>n.keep(r))}trace(e,n,o){let i=this.ctx;tl({nodes:i.nodeEls(),edges:i.edgeEls(),canvas:i.canvas},i.routes(),e,n,o),i.syncBundles()}toggleFocusMode(e){let n=this.ctx;if(this.focusLocked){this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,n.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),n.flow.clear(),n.syncBundles(),n.announce("Focus mode off.");let o=this.hoverId;o&&(this.hoverId=null,this.setHover(o));return}if(!e||e.kind!=="node"){n.toast("Select a node first, then press F to focus.");return}this.focusLocked=!0,this.focusNodeId=e.id,this.retraceFocus(),this.focusLocked&&(n.flow.stream(this.focusShown??e.id,"lineage"),n.announce("Focus mode on."))}destroy(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null)}};function kl(t,e,n,o){let i=n?t.querySelector(".mlv-group__header"):t;if(!i)return;let s=t.querySelector(".mlv-group__chevron-btn");s&&(_(s,"click",d=>{d.preventDefault(),d.stopPropagation(),o.isGroup(e)&&o.toggleCollapse(e)}),_(s,"dblclick",d=>{d.preventDefault(),d.stopPropagation()}));let r=n||o.isGroup(e),l=null,a=()=>{l!==null&&(clearTimeout(l),l=null)};o.addDisposer(a),_(i,"click",d=>{if(d.stopPropagation(),!r){o.activateNode(e,d);return}a(),l=setTimeout(()=>{l=null,o.activateNode(e)},220)}),_(i,"dblclick",d=>{d.preventDefault(),d.stopPropagation(),a(),o.isGroup(e)?o.toggleCollapse(e):r||o.openNode(e,!1)}),_(i,"pointerenter",()=>o.hoverIntent(e)),_(i,"pointerleave",()=>o.hoverIntent(null)),_(i,"keydown",d=>{d.key==="Enter"&&!d.ctrlKey&&!d.metaKey&&!d.shiftKey?(d.preventDefault(),d.stopPropagation(),o.openNode(e,d.altKey)):d.key===" "&&o.isGroup(e)&&(d.preventDefault(),d.stopPropagation(),o.toggleCollapse(e))})}function Ll(t,e,n){let o=t.querySelector(".mlv-edge__hit");if(!o)return;let i=o;_(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),_(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),_(i,"pointerenter",()=>n.enterEdge(e)),_(i,"pointerleave",()=>n.leaveEdge(e)),_(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),_(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),_(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Cn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new hn;this.mountSerial=ps();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new kn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new xn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new Ln,this.canvasEl.appendChild(this.toasts.root),this.viewport=new yn(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Sl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new _n({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new In({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Sn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new Set(e)}get minimapCollapsed(){return this.minimap.collapsed}setMinimapCollapsed(e){this.minimap.setCollapsed(e)}setPanelWidth(e){e>0&&this.minimap.root.classList.toggle("is-narrow",e<=900)}minimapUnavailable(){let e=this.minimap.root;return e.hidden?"Shown when "+30+" or more cards are drawn":e.classList.contains("is-narrow")?"No room in a panel "+900+" px wide or narrower":e.classList.contains("is-short")?"No room in a canvas under "+350+" px tall":null}setStale(e){this.staleFiles=new Map(e.map(n=>[n.path,n.reason]))}nodeElement(e){return this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=kr(this.index,this.collapsedSet),this.routes=Or(this.index,this.frameData,this.collapsedSet),this.labelPlan=hs(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?vn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=Xr({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,l)=>kl(s,r,l,n),wireEdge:(s,r)=>Ll(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,go(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=Yr(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(ml(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(gl(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,l=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+l+(l===1?" step":" steps")+" hidden.":" expanded."))}overview(){if(!this.index)return 0;let e=[];for(let n of this.index.graph.nodes||[])this.index.isGroup(n.id)&&e.push(n.id);return this.collapsedSet=new Set(e),this.relayout(),this.viewport.fitWhole(),this.host.afterCollapse(),this.host.announce("Overview: "+e.length+(e.length===1?" group":" groups")+" collapsed, whole diagram fitted."),e.length}expandAncestors(e){if(!this.index)return!1;let n=!1;for(let o of this.index.ancestors(e))this.collapsedSet.delete(o)&&(n=!0);return n&&this.relayout(),n}centerOnNode(e,n){if(!this.index||!this.frameData)return;let o=this.index.visibleRepresentative(e,this.collapsedSet),i=this.frameData.boxes.get(o);if(!i||(this.viewport.centerOn(i),!n))return;let s=this.nodeEls.get(o);s&&(s.classList.add("is-pulse"),setTimeout(()=>s.classList.remove("is-pulse"),700))}revealNode(e,n){if(!this.index||!this.frameData)return;let o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Fe){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else r&&(l=this.edgeEls.get(r)?.querySelector(".mlv-edge__hit"));if(l)try{l.focus()}catch{}}frameIssue(e){if(!this.index||!this.frameData)return;let n=this.index.issueById.get(e);if(!n)return;let o=[],i=[];for(let d of n.nodeIds){let c=this.targetRect({kind:"node",id:d});c&&o.push(c)}for(let d of n.edgeIds){let c=this.targetRect({kind:"edge",id:d});c&&i.push(c)}let s=o.concat(i);if(!s.length)return;let r=d=>{let c=Math.min(...d.map(h=>h.x)),u=Math.min(...d.map(h=>h.y));return{x:c,y:u,w:Math.max(...d.map(h=>h.x+h.w))-c,h:Math.max(...d.map(h=>h.y+h.h))-u}},l=r(s),a=!o.length||!i.length||this.viewport.fitsAt(l,bn)?l:r(o);this.viewport.frameRect(a,s[0],_t),n.nodeIds[0]&&this.pulseNode(this.index.visibleRepresentative(n.nodeIds[0],this.collapsedSet))}revealEdge(e){let n=this.targetRect({kind:"edge",id:e});n&&(this.viewport.vp.zoomn.classList.remove("is-pulse"),700))}zoomStep(e){let n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Hr(this.index,this.frameData,o,n):Uo(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Tl='button, [role="button"], a[href], select';function Rl(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var Tn=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(_(e,"keydown",o=>this.onKey(o))),this.disposers.push(_(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Tl),n=Rl(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function De(t,e=si()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Ol=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Hl=["svg","png","copy-svg"],Jf=0,Rn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Jf;this.button=ne("mlv-btn mlv-btn--icon mlv-btn--more","More actions"),this.button.title="More: 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r=f("button","mlv-moremenu__item");r.type="button",r.tabIndex=-1,r.setAttribute("role",s.check?"menuitemcheckbox":"menuitem"),r.setAttribute("data-more-item",s.id),Hl.indexOf(s.id)>=0&&r.setAttribute("data-export-action",s.id),s.folded&&r.setAttribute("data-folded","1"),r.appendChild(D(s.icon,14)),g(r,f("span","mlv-moremenu__label",s.label)),s.id==="minimap"&&(g(r,f("span","mlv-moremenu__note")).hidden=!0),s.keys&&g(r,f("kbd","mlv-moremenu__keys",De(s.keys))).setAttribute("aria-hidden","true"),_(r,"click",l=>{if(l.preventDefault(),r.disabled)return;let a=l.detail===0;this.setOpen(!1),this.onPick(s.id,a)}),this.panel.appendChild(r),this.items.set(s.id,r)}_(this.panel,"keydown",s=>this.onKey(s));let i=typeof document>"u"?null:document;i&&(this.disposers.push(_(i,"pointerdown",s=>{if(!this.openState)return;let 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a/vscode-extension/src/authoredPanel.ts b/vscode-extension/src/authoredPanel.ts index 0356a5f2..e8d25de2 100644 --- a/vscode-extension/src/authoredPanel.ts +++ b/vscode-extension/src/authoredPanel.ts @@ -2,14 +2,14 @@ import { createHash } from 'node:crypto'; import * as fs from 'node:fs/promises'; import * as path from 'node:path'; import * as vscode from 'vscode'; -import { createNonce, findRootHint, rootHintJumpText, rootHintText, staleBannerText, staleJumpText, staleToastText, themeKindOf, toEditorLine, type RootHint } from './authoredSupport'; +import { blockedOpenText, createNonce, findRootHint, hintFolderName, rootHintJumpText, rootHintText, staleBannerText, staleJumpText, staleToastText, themeKindOf, toEditorLine, type OpenBlockReason, type RootHint } from './authoredSupport'; import { MAX_EXPORT_BYTES, parseExportFileMessage, saveExportedFile } from './exportDiagram'; import { DependencySet, identity } from './fileIdentity'; import type { Logger } from './log'; import { buildRefinementPrompt, REFINE_INTENTS, toPosixRelative, type RefineIntent, type RefineSelection } from './refinePrompt'; import { displayIssue, displayText } from './displayText'; import { canonicalJson, jsonDepth, lenientRevision, MAX_JSON_DEPTH, RevisionLineage, semanticJson, type Candidate, type Verdict } from './revisionLineage'; -import { ID_PATTERN, MAX_DOCUMENT_BYTES, MAX_SOURCE_BYTES, quoteMatches, readSourceBytes, trackedFiles, validateWorkflow, validateWorkflowStructure, type ValidatedWorkflow, type ValidationIssue, type WorkflowEvidence } from './workflowDocument'; +import { ID_PATTERN, MAX_DOCUMENT_BYTES, MAX_SOURCE_BYTES, quoteMatches, readSourceBytes, trackedFiles, validateWorkflow, validateWorkflowStructure, type StaleFile, type ValidatedWorkflow, type ValidationIssue, type WorkflowEvidence } from './workflowDocument'; export const AUTHORED_VIEW_TYPE = 'mlview.authoredDiagram'; export const OPEN_AUTHORED_COMMAND = 'mlview.openGeneratedDiagram'; const RELOAD_DEBOUNCE_MS = 120; @@ -143,6 +143,29 @@ interface Jump { revision: string; freshness: number; seq: number; + /** The webview's own sequence number for this open, when it sent one (the review walk does). */ + openSeq?: number; +} +/** + * What became of one source jump (viewer M3): opened; dropped because a newer jump, a new revision + * or a freshness change overtook it; or blocked, with the reason, the short sentence the webview + * shows and the warning an ordinary (non-walk) open still raises as a notification. + */ +type JumpOutcome = + | { outcome: 'done' } + | { outcome: 'cancelled' } + | { outcome: 'blocked'; reason: OpenBlockReason; message: string; warning: string }; +const CANCELLED: JumpOutcome = { outcome: 'cancelled' }; +/** + * The jump checks of one revision and freshness version (viewer M3, KI-09): per cited file, the + * file's identity on disk when it was checked (device, inode, size and change times) and whether it + * was stale then. A walk that steps through 27 citations of one notebook reads and hashes it once, + * and runs at most one full validation, instead of once per step. + */ +interface JumpChecks { + revision: string; + freshness: number; + files: Map; } /** Outcome of reading the artifact bytes from disk (never from an editor buffer). */ export type ArtifactRead = { kind: 'bytes'; bytes: Uint8Array } | { kind: 'missing' } | { kind: 'unreadable'; detail: string; transient?: boolean }; @@ -653,6 +676,13 @@ class AuthoredPanel implements vscode.Disposable { private highlight: vscode.TextEditorDecorationType | undefined; /** The number of the latest source jump (see `Jump`). */ private jumpSeq = 0; + /** + * The highest `seq` the webview page sent with an open (viewer M3); an open with a lower or equal + * one is superseded. A new page starts again from 0 (`ready`). + */ + private lastOpenSeq = 0; + /** The cached checks behind source jumps, for the current revision and freshness (`JumpChecks`). */ + private jumpChecks: JumpChecks | undefined; /** The editor group the last jump showed its source in (`navigationColumn`). */ private jumpColumn: vscode.ViewColumn | undefined; /** Editor groups the reader used outside the panel, most recent first (`navigationColumn`). */ @@ -1091,7 +1121,7 @@ class AuthoredPanel implements vscode.Disposable { if (version === this.dirtyVersion) this.dirty = result; } - private actionResult(requestId: string | undefined, action: 'exportFile' | 'copy' | 'refineWorkflow', outcome: 'done' | 'cancelled' | 'failed', extra: { message?: string; name?: string } = {}): void { + private actionResult(requestId: string | undefined, action: 'exportFile' | 'copy' | 'refineWorkflow' | 'openLocation', outcome: 'done' | 'cancelled' | 'failed' | 'blocked', extra: { message?: string; name?: string; reason?: OpenBlockReason; seq?: number } = {}): void { if (requestId) this.post({ v: 1, type: 'actionResult', requestId, action, outcome, ...extra }); } @@ -1104,6 +1134,8 @@ class AuthoredPanel implements vscode.Disposable { const requestId = typeof m.requestId === 'string' && REQUEST_ID.test(m.requestId) ? m.requestId : undefined; if (m.type === 'ready') { this.ready = true; + // A new page numbers its opens from the start again. + this.lastOpenSeq = 0; this.post({ v: 1, type: 'init', @@ -1134,7 +1166,14 @@ class AuthoredPanel implements vscode.Disposable { return; } if (m.type === 'openLocation') { - await this.openEvidence(m); + await this.openEvidence(m, requestId); + return; + } + // Viewer M3: the review walk ended. Its highlight goes, and a walk open still on its way + // (a notebook waiting for its cell editor) no longer lands. + if (m.type === 'walk') { + if (m.state === 'end') + this.endWalk(); return; } if (m.type === 'workspaceHint') { @@ -1246,19 +1285,50 @@ class AuthoredPanel implements vscode.Disposable { void vscode.window.showInformationMessage(`MLView refinement prompt copied. Paste it into the assistant that authored this diagram.${note}`); this.actionResult(requestId, 'refineWorkflow', 'done'); } - private async openEvidence(m: Record): Promise { + /** + * One `openLocation` request. `focus: true` is the explicit "open and go to the editor" gesture; + * every other open keeps the keyboard on the diagram. Viewer M3, for the review walk: `seq` + * (a positive integer, increasing per page) drops an open that a later one already replaced; + * `requestId` asks for one `actionResult` (`done`, `blocked` with the reason, `cancelled` when it + * was superseded, `failed` when VS Code could not show the file); `walk: true` raises no + * notification for a blocked open, whose reason goes back to the webview instead; `highlight: + * false` selects and reveals the range without the whole-range decoration. + */ + private async openEvidence(m: Record, requestId: string | undefined): Promise { const id = typeof m.evidenceId === 'string' ? m.evidenceId : undefined; - // `focus: true` is the explicit "open and go to the editor" gesture; every other open keeps - // the keyboard on the diagram. const focus = m.focus === true; + const walk = m.walk === true; + const highlight = m.highlight !== false; + const seq = typeof m.seq === 'number' && Number.isSafeInteger(m.seq) && m.seq > 0 ? m.seq : undefined; + const answer = (outcome: JumpOutcome | { outcome: 'failed'; message: string }): void => { + const extra = outcome.outcome === 'blocked' ? { message: outcome.message, reason: outcome.reason } : outcome.outcome === 'failed' ? { message: outcome.message } : {}; + this.actionResult(requestId, 'openLocation', outcome.outcome, seq === undefined ? extra : { ...extra, seq }); + }; + if (seq !== undefined) { + // Superseded: the page already sent a later open (messages can overtake one another + // across a page reload, never within one page, but the order is the page's to decide). + if (seq <= this.lastOpenSeq) { + answer(CANCELLED); + return; + } + this.lastOpenSeq = seq; + } const shown = this.lastValid; const evidence = shown?.document.evidence.find(x => x.id === id); - if (!shown || !evidence) + if (!shown || !evidence) { + answer({ outcome: 'blocked', reason: 'unknown', message: blockedOpenText('unknown', ''), warning: '' }); return; - const jump: Jump = { revision: shown.document.revision.id, freshness: this.freshnessVersion, seq: ++this.jumpSeq }; + } + const jump: Jump = { revision: shown.document.revision.id, freshness: this.freshnessVersion, seq: ++this.jumpSeq, ...(seq !== undefined ? { openSeq: seq } : {}) }; let behind = false; + let outcome: JumpOutcome; try { - await this.jumpTo(evidence, shown, jump, focus, () => { behind = true; }); + outcome = await this.jumpTo(evidence, shown, jump, { focus, highlight }, () => { behind = true; }); + } + catch (error) { + this.log.warn(`source navigation failed: ${error instanceof Error ? error.message : String(error)}`); + answer({ outcome: 'failed', message: `VS Code could not show ${displayText(evidence.file, 200)}.` }); + return; } finally { // The jump's own check found files the panel has not caught up with (no watcher event @@ -1266,52 +1336,113 @@ class AuthoredPanel implements vscode.Disposable { if (behind) this.sourceChanged(); } + // Viewer M3: an open from the review walk raises no notification (no toast storm while + // stepping through changed files); the webview shows the reason in its walk bar instead. + if (outcome.outcome === 'blocked' && !walk && outcome.warning) + void vscode.window.showWarningMessage(outcome.warning); + answer(outcome); + } + private async jumpTo(evidence: WorkflowEvidence, shown: ValidatedWorkflow, jump: Jump, options: { focus: boolean; highlight: boolean }, markBehind: () => void): Promise { + const checked = await this.checkCitedFile(evidence, shown, jump, markBehind); + if ('outcome' in checked) + return checked; + const file = displayText(evidence.file, 200); + const staleFile = checked.stale; + if (staleFile) { + const hint = this.rootHint; + if (hint && hint.files.includes(evidence.file)) + return { outcome: 'blocked', reason: 'elsewhere', message: blockedOpenText('elsewhere', file, { folder: listFiles([hintFolderName(hint)]) }), warning: rootHintJumpText(evidence.id, file, hint, listFiles) }; + return { outcome: 'blocked', reason: staleFile.reason, message: blockedOpenText(staleFile.reason, file, { revisionId: jump.revision }), warning: staleJumpText(evidence.id, file, staleFile.reason, jump.revision) }; + } + const open = await this.findOpenDocument(evidence); + if (!this.navigationCurrent(jump)) + return CANCELLED; + if (!this.unsavedTextStillCites(evidence, open)) + return { outcome: 'blocked', reason: 'unsaved', message: blockedOpenText('unsaved', file), warning: `MLView: unsaved changes in ${file} no longer contain the lines cited by evidence ${evidence.id}; save or revert the file, then try again.` }; + return this.navigate(evidence, jump, open, options); } - private async jumpTo(evidence: WorkflowEvidence, shown: ValidatedWorkflow, jump: Jump, focus: boolean, markBehind: () => void): Promise { - let fresh: ValidatedWorkflow; + /** + * Whether the cited file is stale, decided once per revision, freshness version and file + * identity (`JumpChecks`): from the cache while the file's identity on disk is unchanged; else + * by hashing that one file when the displayed revision's validation read it fresh; else by a + * full validation, whose verdicts are cached for every cited file. The identities are taken + * before the file is read, so a cached verdict is never newer than the bytes it was decided on. + */ + private async checkCitedFile(evidence: WorkflowEvidence, shown: ValidatedWorkflow, jump: Jump, markBehind: () => void): Promise { + const signature = await this.fileSignature(evidence.file); + const cached = this.cachedCheck(jump, evidence.file, signature); + if (cached) { + if (!this.navigationCurrent(jump)) + return CANCELLED; + return { stale: cached.stale }; + } + if (!this.navigationCurrent(jump)) + return CANCELLED; if (await this.unchangedSinceValidation(shown, evidence)) { // The cited file's bytes are the ones the displayed revision was validated against, so // the quote still matches: no full revalidation for this jump. if (!this.navigationCurrent(jump)) - return; - fresh = shown; + return CANCELLED; + this.storeChecks(jump, new Map([[evidence.file, signature]]), shown.stale); + return { stale: undefined }; } - else { - const displayed = this.lineage.displayed; - let result: ValidationResult | undefined; - try { - result = await this.validate(shown.document, displayed && !displayed.verified ? displayed.baseline : undefined); - } - catch { - result = { issues: [{ path: '$', message: 'validation failed' }] }; - } - if (!result || !this.navigationCurrent(jump)) - return; - if (!result.value) { - const first = result.issues[0]; - void vscode.window.showWarningMessage(`MLView: evidence ${evidence.id} could not be checked (${first ? displayIssue(first) : 'unknown problem'}); source navigation was stopped.`); - return; - } - fresh = result.value; - if (JSON.stringify(fresh.stale) !== JSON.stringify(shown.stale)) - markBehind(); + const cited = [...new Set(shown.document.evidence.map(e => e.file))]; + const signatures = new Map(await Promise.all(cited.map(async rel => [rel, rel === evidence.file ? signature : await this.fileSignature(rel)] as const))); + const displayed = this.lineage.displayed; + let result: ValidationResult | undefined; + try { + result = await this.validate(shown.document, displayed && !displayed.verified ? displayed.baseline : undefined); } - const staleFile = fresh.stale.find(s => s.rel === evidence.file); - if (staleFile) { - const hint = this.rootHint; - void vscode.window.showWarningMessage(hint && hint.files.includes(evidence.file) - ? rootHintJumpText(evidence.id, displayText(evidence.file, 200), hint, listFiles) - : staleJumpText(evidence.id, displayText(evidence.file, 200), staleFile.reason, jump.revision)); - return; + catch { + result = { issues: [{ path: '$', message: 'validation failed' }] }; + } + if (!result || !this.navigationCurrent(jump)) + return CANCELLED; + if (!result.value) { + const first = result.issues[0]; + const issue = first ? displayIssue(first) : 'unknown problem'; + return { outcome: 'blocked', reason: 'unchecked', message: blockedOpenText('unchecked', displayText(evidence.file, 200), { issue }), warning: `MLView: evidence ${evidence.id} could not be checked (${issue}); source navigation was stopped.` }; + } + const fresh = result.value; + // The panel is behind (no watcher event yet): it validates again and moves to a new + // freshness version, so these verdicts are not kept. + if (JSON.stringify(fresh.stale) !== JSON.stringify(shown.stale)) + markBehind(); + else + this.storeChecks(jump, signatures, fresh.stale); + return { stale: fresh.stale.find(s => s.rel === evidence.file) }; + } + /** A cited file's identity on disk, or why it has none; any change to the file changes it. */ + private async fileSignature(rel: string): Promise { + try { + const stat = await fs.stat(path.resolve(this.folder.uri.fsPath, rel), { bigint: true }); + return `${stat.dev}:${stat.ino}:${stat.size}:${stat.mtimeNs}:${stat.ctimeNs}`; } - const open = await this.findOpenDocument(evidence); - if (!this.navigationCurrent(jump)) - return; - if (!this.unsavedTextStillCites(evidence, open)) { - void vscode.window.showWarningMessage(`MLView: unsaved changes in ${displayText(evidence.file, 200)} no longer contain the lines cited by evidence ${evidence.id}; save or revert the file, then try again.`); - return; + catch (error) { + const code = (error as NodeJS.ErrnoException | undefined)?.code; + return `error:${typeof code === 'string' ? code : 'unknown'}`; } - await this.navigate(evidence, jump, open, focus); + } + private cachedCheck(jump: Jump, rel: string, signature: string): { stale: StaleFile | undefined } | undefined { + const checks = this.jumpChecks; + if (!checks || checks.revision !== jump.revision || checks.freshness !== jump.freshness) + return undefined; + const entry = checks.files.get(rel); + return entry && entry.signature === signature ? { stale: entry.stale } : undefined; + } + /** Keep the verdicts for `signatures` while the jump's revision and freshness are still current. */ + private storeChecks(jump: Jump, signatures: ReadonlyMap, stale: readonly StaleFile[]): void { + if (this.disposed || this.lastValid?.document.revision.id !== jump.revision || this.freshnessVersion !== jump.freshness) + return; + if (!this.jumpChecks || this.jumpChecks.revision !== jump.revision || this.jumpChecks.freshness !== jump.freshness) + this.jumpChecks = { revision: jump.revision, freshness: jump.freshness, files: new Map() }; + for (const [rel, signature] of signatures) + this.jumpChecks.files.set(rel, { signature, stale: stale.find(s => s.rel === rel) }); + } + /** Viewer M3: the walk ended. Its highlight is cleared and an open still on its way is dropped. */ + private endWalk(): void { + this.jumpSeq++; + this.clearHighlight(); } /** * True when the cited file is fresh in the displayed revision's last validation and its bytes @@ -1361,9 +1492,13 @@ class AuthoredPanel implements vscode.Disposable { } return true; } - /** The jump may still act: same revision and freshness, and no newer jump has started. */ + /** + * The jump may still act: same revision and freshness, no newer jump has started, and (for an + * open the webview numbered) the page has sent no later open (viewer M3). + */ private navigationCurrent(jump: Jump): boolean { - return !this.disposed && this.lastValid?.document.revision.id === jump.revision && this.freshnessVersion === jump.freshness && this.jumpSeq === jump.seq; + return !this.disposed && this.lastValid?.document.revision.id === jump.revision && this.freshnessVersion === jump.freshness && this.jumpSeq === jump.seq + && (jump.openSeq === undefined || jump.openSeq === this.lastOpenSeq); } /** * The panel's own editor group. VS Code revives a restored panel with column 0 and reports its @@ -1426,23 +1561,23 @@ class AuthoredPanel implements vscode.Disposable { } /** * Open the cited source beside the panel, select the whole cited range and highlight it. - * `focus` false (the default gesture) keeps the keyboard on the diagram. + * `focus` false (the default gesture) keeps the keyboard on the diagram; `highlight` false + * leaves the whole-range decoration off. */ - private async navigate(e: WorkflowEvidence, jump: Jump, open: { text?: vscode.TextDocument; notebook?: vscode.NotebookDocument }, focus: boolean): Promise { + private async navigate(e: WorkflowEvidence, jump: Jump, open: { text?: vscode.TextDocument; notebook?: vscode.NotebookDocument }, options: { focus: boolean; highlight: boolean }): Promise { const uri = open.notebook?.uri ?? open.text?.uri ?? vscode.Uri.file(path.join(this.folder.uri.fsPath, e.file)); const start = toEditorLine(e.line), end = toEditorLine(e.endLine); - if (e.cell !== undefined) { - await this.navigateCell(e.cell, uri, start, end, jump, focus); - return; - } + if (e.cell !== undefined) + return this.navigateCell(e.cell, displayText(e.file, 200), uri, start, end, jump, options); const doc = await vscode.workspace.openTextDocument(uri); if (!this.navigationCurrent(jump)) - return; - const editor = await vscode.window.showTextDocument(doc, { preview: true, preserveFocus: !focus, viewColumn: this.navigationColumn(doc) }); + return CANCELLED; + const editor = await vscode.window.showTextDocument(doc, { preview: true, preserveFocus: !options.focus, viewColumn: this.navigationColumn(doc) }); this.noteJumpColumn(editor.viewColumn); if (!this.navigationCurrent(jump)) - return; - this.showRange(editor, citedRange(doc, start, end)); + return CANCELLED; + this.showRange(editor, citedRange(doc, start, end), options.highlight); + return { outcome: 'done' }; } /** * A notebook citation: show the notebook with the cited cell selected and revealed, then @@ -1450,36 +1585,37 @@ class AuthoredPanel implements vscode.Disposable { * only once the cell is drawn; when it does not appear in time, the cell stays selected and * revealed without the line highlight. */ - private async navigateCell(index: number, uri: vscode.Uri, start: number, end: number, jump: Jump, focus: boolean): Promise { + private async navigateCell(index: number, file: string, uri: vscode.Uri, start: number, end: number, jump: Jump, options: { focus: boolean; highlight: boolean }): Promise { const notebook = await vscode.workspace.openNotebookDocument(uri); if (!this.navigationCurrent(jump)) - return; + return CANCELLED; // VS Code clamps cellAt's index, so a removed cell must be detected by count. - if (index >= notebook.cellCount) { - void vscode.window.showWarningMessage(`MLView: notebook cell ${index} no longer exists.`); - return; - } + if (index >= notebook.cellCount) + return { outcome: 'blocked', reason: 'cell-missing', message: blockedOpenText('cell-missing', file, { cell: index }), warning: `MLView: notebook cell ${index} no longer exists.` }; const cell = notebook.cellAt(index); const cells = new vscode.NotebookRange(index, index + 1); - const notebookEditor = await vscode.window.showNotebookDocument(notebook, { preview: true, preserveFocus: !focus, viewColumn: this.navigationColumn(cell.document, notebook), selections: [cells] }); + const notebookEditor = await vscode.window.showNotebookDocument(notebook, { preview: true, preserveFocus: !options.focus, viewColumn: this.navigationColumn(cell.document, notebook), selections: [cells] }); this.noteJumpColumn(notebookEditor.viewColumn); if (!this.navigationCurrent(jump)) - return; + return CANCELLED; notebookEditor.revealRange(cells, vscode.NotebookEditorRevealType.InCenterIfOutsideViewport); const cellEditor = await visibleEditorFor(cell.document, CELL_EDITOR_WAIT_MS); // A newer jump may have started during the wait: it owns the selection and the highlight. if (!this.navigationCurrent(jump)) - return; + return CANCELLED; if (cellEditor) - this.showRange(cellEditor, citedRange(cell.document, start, end)); + this.showRange(cellEditor, citedRange(cell.document, start, end), options.highlight); else this.clearHighlight(); + return { outcome: 'done' }; } - /** Select the whole range, reveal it, and move the highlight to it. */ - private showRange(editor: vscode.TextEditor, range: vscode.Range): void { + /** Select the whole range, reveal it, and move the highlight to it (`highlight` false: only clear the old one). */ + private showRange(editor: vscode.TextEditor, range: vscode.Range, highlight = true): void { editor.selection = new vscode.Selection(range.start, range.end); editor.revealRange(range, vscode.TextEditorRevealType.InCenter); this.clearHighlight(); + if (!highlight) + return; this.highlight = vscode.window.createTextEditorDecorationType(HIGHLIGHT_STYLE()); editor.setDecorations(this.highlight, [range]); } @@ -1496,8 +1632,18 @@ class AuthoredPanel implements vscode.Disposable { * theme and capabilities on the bridge before the viewer mounts, mounts on the first * `workflow`, and shows `workflowError` banners until then, in a `
`. After the mount the
      * viewer's own listener applies every later frame, and draws the banner itself.
+     *
+     * Viewer M3: VS Code's webview host forwards every keydown to the workbench from a listener on
+     * the page's window, even a key the page already handled, and the workbench runs any keybinding
+     * that matches. MEASURED live (VS Code 1.139): one Escape on a card collapsed the bottom sheet
+     * and also dismissed a VS Code notification. An Escape the viewer acted on (it collapsed the
+     * sheet, closed the legend, cleared the selection) marks the event handled, and a listener on
+     * the document stops it there, before it reaches the window: one Escape, one action. It is added
+     * once the viewer has mounted, so it runs after the viewer's own document listeners. (A listener
+     * on the window would come too late: VS Code's forwarder is attached to that window before this
+     * page's scripts run, and it stays attached; checked live.)
      */
-    private render(): void { const nonce = createNonce(); const script = this.panel.webview.asWebviewUri(vscode.Uri.joinPath(this.ctx.extensionUri, 'media', 'mlview.js')); const style = this.panel.webview.asWebviewUri(vscode.Uri.joinPath(this.ctx.extensionUri, 'media', 'mlview.css')); this.panel.webview.html = `
`; }
+    private render(): void { const nonce = createNonce(); const script = this.panel.webview.asWebviewUri(vscode.Uri.joinPath(this.ctx.extensionUri, 'media', 'mlview.js')); const style = this.panel.webview.asWebviewUri(vscode.Uri.joinPath(this.ctx.extensionUri, 'media', 'mlview.css')); this.panel.webview.html = `
`; }
     dispose(): void {
         if (this.disposed)
             return;
diff --git a/vscode-extension/src/authoredSupport.ts b/vscode-extension/src/authoredSupport.ts
index efaa0e1f..590d01c8 100644
--- a/vscode-extension/src/authoredSupport.ts
+++ b/vscode-extension/src/authoredSupport.ts
@@ -84,6 +84,33 @@ export function staleJumpText(evidenceId: string, file: string, reason: StaleRea
     return `MLView: evidence ${evidenceId} cites ${file}, ${why}; navigation to it is blocked.`;
 }
 
+/**
+ * Why the host did not open a cited range (viewer M3): a stale reason, the root hint's `elsewhere`,
+ * unsaved text that lost the cited lines, a notebook cell that no longer exists, a file that could
+ * not be checked, or evidence the displayed revision does not have.
+ */
+export type OpenBlockReason = StaleReasonWord | 'elsewhere' | 'unsaved' | 'cell-missing' | 'unchecked' | 'unknown';
+
+/**
+ * The short sentence a blocked open answers with (`actionResult.message`), for the review walk's
+ * bar: what is wrong with the file and that nothing was opened. `file` is already bounded and
+ * escaped (displayText); the cell index is the contract's zero-based one, as the viewer shows it.
+ */
+export function blockedOpenText(reason: OpenBlockReason, file: string, detail: { revisionId?: string; folder?: string; cell?: number; issue?: string } = {}): string {
+    const revision = detail.revisionId ? `revision ${detail.revisionId}` : 'the revision';
+    switch (reason) {
+        case 'changed': return `${file} changed after ${revision} was published; not opened.`;
+        case 'missing': return `${file} is missing since ${revision} was published; not opened.`;
+        case 'unreadable': return `${file} can no longer be read; not opened.`;
+        case 'too-large': return `${file} has grown past the size MLView can check; not opened.`;
+        case 'elsewhere': return `${file} is not in the workspace root; it is unchanged in ${detail.folder ?? 'another folder'}. Not opened.`;
+        case 'unsaved': return `Unsaved changes in ${file} no longer contain the cited lines; not opened. Save or revert the file.`;
+        case 'cell-missing': return `Cell ${detail.cell ?? '?'} of ${file} no longer exists; not opened.`;
+        case 'unchecked': return `${file} could not be checked (${detail.issue ?? 'unknown problem'}); not opened.`;
+        default: return 'This evidence is not in the displayed revision; not opened.';
+    }
+}
+
 /** A folder under the workspace root where the missing cited files exist with their published hashes. */
 export interface RootHint {
     /** Absolute path of the folder the citations resolve against. */
diff --git a/vscode-extension/src/testEntry.ts b/vscode-extension/src/testEntry.ts
index d9898443..4a7be0a3 100644
--- a/vscode-extension/src/testEntry.ts
+++ b/vscode-extension/src/testEntry.ts
@@ -1,4 +1,4 @@
-export { createNonce, themeKindOf, toEditorLine, staleBreakdown, staleBannerText, staleToastText, staleJumpText, rootHintCandidates, mostlyMissing, findRootHint, rootHintText, rootHintJumpText, hintFolderName } from './authoredSupport';
+export { createNonce, themeKindOf, toEditorLine, staleBreakdown, staleBannerText, staleToastText, staleJumpText, blockedOpenText, rootHintCandidates, mostlyMissing, findRootHint, rootHintText, rootHintJumpText, hintFolderName } from './authoredSupport';
 export {
   decodeExportPayload,
   defaultExportName,
diff --git a/vscode-extension/test/bootstrap.test.js b/vscode-extension/test/bootstrap.test.js
index 7830b58d..85bee5fd 100644
--- a/vscode-extension/test/bootstrap.test.js
+++ b/vscode-extension/test/bootstrap.test.js
@@ -34,7 +34,9 @@ function stubEnvironment() {
     }
   };
   elements.set('mlview-root', root);
+  const documentListeners = [];
   const document = {
+    addEventListener(type, listener, options) { documentListeners.push({ type, listener, options }); },
     getElementById: (id) => elements.get(id) || null,
     createElement: (tag) => {
       const element = {
@@ -61,7 +63,9 @@ function stubEnvironment() {
     loadState() { return state; }
   };
   const mounts = [];
+  const windowListeners = [];
   const window = {
+    addEventListener(type, listener, options) { windowListeners.push({ type, listener, options }); },
     MLView: {
       bridges: { vscode: () => bridge },
       mountWorkflow(target, doc, withBridge) {
@@ -70,7 +74,7 @@ function stubEnvironment() {
       }
     }
   };
-  return { window, document, root, bridge, mounts, deliver: (message) => listener(message) };
+  return { window, document, root, bridge, mounts, windowListeners, documentListeners, deliver: (message) => listener(message) };
 }
 
 test('bootstrap posts one ready, stashes init before mount, and mounts on the first workflow only', async () => {
@@ -141,3 +145,29 @@ test('after the mount the bootstrap draws no banner and removes a leftover one',
   assert.equal(env.root.children.length, 0, 'the bootstrap ignores the stale frame');
   assert.equal(env.bridge.posted.length, 1, 'only the bootstrap ready is ever posted');
 });
+
+// Viewer M3: VS Code's webview host forwards every keydown to the workbench from a listener on the
+// page's window, even a key the page already handled. Once the viewer has mounted, the bootstrap
+// stops an Escape the viewer acted on at the document, before it reaches that window; any other
+// key, and an Escape nobody handled, still goes to VS Code.
+test('after the mount the bootstrap stops an Escape the viewer handled before VS Code forwards it', async () => {
+  const source = await bootstrapSource();
+  const env = stubEnvironment();
+  vm.runInNewContext(source, { window: env.window, document: env.document, Object });
+  const keydown = () => env.documentListeners.filter((entry) => entry.type === 'keydown');
+  assert.equal(keydown().length, 0, 'nothing is intercepted before the viewer mounts');
+  env.deliver({ v: 1, type: 'workflow', document: { revision: { id: 'r1' } } });
+  env.deliver({ v: 1, type: 'workflow', document: { revision: { id: 'r2' } } });
+  assert.equal(keydown().length, 1, 'one document keydown listener, added once at the mount');
+  assert.notEqual(keydown()[0].options, true, 'a bubble-phase listener, so it runs after the viewer handled the key');
+  assert.equal(env.windowListeners.length, 0, 'nothing on the window, where VS Code forwards from');
+  const press = (key, defaultPrevented) => {
+    const event = { key, defaultPrevented, stopped: false, stopPropagation() { event.stopped = true; } };
+    keydown()[0].listener(event);
+    return event.stopped;
+  };
+  assert.equal(press('Escape', true), true, 'a handled Escape stops at the document');
+  assert.equal(press('Escape', false), false, 'an Escape the viewer did not use still reaches VS Code');
+  assert.equal(press('Enter', true), false, 'other keys are left alone');
+  assert.equal(press('p', true), false);
+});
diff --git a/vscode-extension/test/walk-host.test.js b/vscode-extension/test/walk-host.test.js
new file mode 100644
index 00000000..8a48cc8e
--- /dev/null
+++ b/vscode-extension/test/walk-host.test.js
@@ -0,0 +1,285 @@
+'use strict';
+/**
+ * Viewer M3, the host side of the review walk (roadmap step 12): numbered opens (`seq`) whose
+ * superseded requests are dropped, one `actionResult` per open with a `requestId`, blocked opens of
+ * stale or missing files that never open them and raise no notification for the walk, the
+ * whole-range highlight with its overview-ruler mark cleared at the walk's end and on dispose, and
+ * the jump checks cached per revision and freshness version. Mock `vscode` only: none of this is a
+ * live check.
+ */
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const fsp = require('node:fs/promises');
+const path = require('node:path');
+const h = require('./panel-helpers');
+const { api, vscode } = h;
+
+const fixtures = [];
+test.afterEach(() => h.cleanup(fixtures));
+async function open(options) {
+  const fixture = await h.openPanel(options);
+  fixtures.push(fixture);
+  return fixture;
+}
+const shown = () => vscode.__recorded.shownDocuments;
+const warnings = () => vscode.__recorded.messages.filter((m) => m[0] === 'warn').map((m) => m[1]);
+const openResults = (panel) => h.results(panel).filter((m) => m.action === 'openLocation');
+const range = (r) => [r.start.line, r.start.character, r.end.line, r.end.character];
+const walkOpen = (panel, evidenceId, seq, extra = {}) => panel.fire({ v: 1, type: 'openLocation', evidenceId, walk: true, seq, requestId: `w${seq}`, ...extra });
+
+/** Two evidence records in two files, lines 2-3 of source.py and line 1 of other.py, published with hashes. */
+function twoFiles() {
+  const document = h.workflow();
+  document.evidence = [
+    { id: 'e', file: 'source.py', line: 2, endLine: 3, quote: 'train()\nsave()' },
+    { id: 'e2', file: 'other.py', line: 1, endLine: 1, quote: 'other()' }
+  ];
+  document.nodes[0].evidence = ['e', 'e2'];
+  document.coverage.inspectedFiles = ['source.py', 'other.py'];
+  const files = { 'source.py': 'import x\ntrain()\nsave()\n', 'other.py': 'other()\n' };
+  return { document: h.verify(document, files), files };
+}
+
+function notebookDocument() {
+  const document = h.workflow('notes.ipynb');
+  document.evidence = [
+    { id: 'e', file: 'notes.ipynb', cell: 1, line: 2, endLine: 3, quote: 'fit()\nsave()' },
+    { id: 'e2', file: 'source.py', line: 1, endLine: 1, quote: 'fit()' }
+  ];
+  document.nodes[0].evidence = ['e', 'e2'];
+  document.coverage.inspectedFiles = ['notes.ipynb', 'source.py'];
+  const notebook = JSON.stringify({ cells: [{ source: ['a()'] }, { source: ['x = 1\n', 'fit()\n', 'save()'] }], metadata: {}, nbformat: 4, nbformat_minor: 5 });
+  return { document, files: { 'notes.ipynb': notebook, 'source.py': 'fit()\n' } };
+}
+async function openNotebookPanel({ cellEditors = true } = {}) {
+  const { document, files } = notebookDocument();
+  const fixture = await open({ raw: document, files, ready: false });
+  vscode.__setNotebooks([{ path: path.join(fixture.root, 'notes.ipynb'), cells: [{ text: 'a()' }, { text: 'x = 1\nfit()\nsave()' }] }]);
+  vscode.__setNotebookCellEditors(cellEditors);
+  fixture.panel.fire({ v: 1, type: 'ready' });
+  await h.tick();
+  return fixture;
+}
+
+test('a walk open is answered done, keeps focus on the diagram and highlights the range with an overview-ruler mark', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered');
+  assert.deepEqual(openResults(panel)[0], { v: 1, type: 'actionResult', requestId: 'w1', action: 'openLocation', outcome: 'done', seq: 1 });
+  assert.equal(shown().length, 1);
+  assert.equal(shown()[0].options.preserveFocus, true, 'preserveFocus stays the default');
+  const [style] = vscode.__recorded.decorationTypes;
+  assert.equal(style.options.overviewRulerColor.id, 'editorOverviewRuler.rangeHighlightForeground');
+  assert.equal(style.options.overviewRulerLane, vscode.OverviewRulerLane.Full);
+  assert.deepEqual(shown()[0].editor.decorations[0].ranges.map(range), [[1, 0, 2, 'save()'.length]]);
+});
+
+test('an open whose seq is not above the last one is dropped and answered cancelled', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  walkOpen(panel, 'e', 5);
+  await h.waitFor(() => openResults(panel).length === 1, 'the first open was not answered');
+  walkOpen(panel, 'e2', 3);
+  walkOpen(panel, 'e2', 5);
+  await h.waitFor(() => openResults(panel).length === 3, 'the late opens were not answered');
+  assert.deepEqual(openResults(panel).map((r) => [r.seq, r.outcome]), [[5, 'done'], [3, 'cancelled'], [5, 'cancelled']]);
+  assert.equal(shown().length, 1, 'neither late open touched an editor');
+  assert.equal(path.basename(shown()[0].document.uri.fsPath), 'source.py');
+  // A malformed seq is ignored, not trusted: the open is treated as unnumbered.
+  panel.fire({ v: 1, type: 'openLocation', evidenceId: 'e2', seq: 'x', requestId: 'm1' });
+  await h.waitFor(() => openResults(panel).length === 4, 'the unnumbered open was not answered');
+  assert.equal(openResults(panel)[3].outcome, 'done');
+  assert.equal('seq' in openResults(panel)[3], false);
+});
+
+test('a burst of numbered opens navigates once, for the last, and answers every one', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  for (let seq = 1; seq <= 12; seq++) walkOpen(panel, seq % 2 ? 'e' : 'e2', seq);
+  await h.waitFor(() => openResults(panel).length === 12, 'not every open was answered');
+  const outcomes = openResults(panel).map((r) => [r.seq, r.outcome]).sort((a, b) => a[0] - b[0]);
+  assert.deepEqual(outcomes, [...Array.from({ length: 11 }, (_, i) => [i + 1, 'cancelled']), [12, 'done']]);
+  assert.equal(shown().length, 1, 'only the last open showed its source');
+  assert.equal(path.basename(shown()[0].document.uri.fsPath), 'other.py');
+  assert.equal(vscode.__recorded.decorationTypes.length, 1);
+});
+
+test('a later open supersedes a notebook open still waiting for its cell editor', async () => {
+  const { panel } = await openNotebookPanel({ cellEditors: false });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.shownNotebooks.length === 1, 'the notebook open did not start');
+  walkOpen(panel, 'e2', 2);
+  await h.waitFor(() => openResults(panel).length === 2, 'both opens were not answered', 3000);
+  assert.deepEqual(openResults(panel).map((r) => [r.seq, r.outcome]).sort((a, b) => a[0] - b[0]), [[1, 'cancelled'], [2, 'done']]);
+  const [highlight] = vscode.__recorded.decorationTypes;
+  assert.equal(highlight.disposed, false, 'the superseded notebook open left the later highlight alone');
+});
+
+test('a changed or missing file is blocked with its reason, never opened, and a walk open raises no notification', async () => {
+  const { document, files } = twoFiles();
+  const { panel, root } = await open({ raw: document, files: { 'source.py': files['source.py'] + '# edited\n' } });
+  const before = warnings().length;
+  walkOpen(panel, 'e', 1);
+  walkOpen(panel, 'e2', 2, { requestId: 'w2' });
+  await h.waitFor(() => openResults(panel).length === 2, 'the blocked opens were not answered');
+  const [changed, missing] = openResults(panel).sort((a, b) => a.seq - b.seq);
+  // The first is superseded by the second before its check ends; ask again on its own.
+  assert.equal(changed.outcome, 'cancelled');
+  assert.deepEqual(missing, { v: 1, type: 'actionResult', requestId: 'w2', action: 'openLocation', outcome: 'blocked', seq: 2, reason: 'missing', message: 'other.py is missing since revision r1 was published; not opened.' });
+  walkOpen(panel, 'e', 3);
+  await h.waitFor(() => openResults(panel).length === 3, 'the changed open was not answered');
+  assert.deepEqual(openResults(panel)[2], { v: 1, type: 'actionResult', requestId: 'w3', action: 'openLocation', outcome: 'blocked', seq: 3, reason: 'changed', message: 'source.py changed after revision r1 was published; not opened.' });
+  assert.equal(shown().length, 0, 'a stale file is never opened');
+  assert.equal(vscode.__recorded.decorationTypes.length, 0);
+  assert.equal(warnings().length, before, 'no notification for an open from the walk');
+  assert.equal(fs.existsSync(path.join(root, 'other.py')), false);
+});
+
+test('an ordinary open of a stale file keeps its notification and, with a requestId, is answered blocked too', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files: { ...files, 'source.py': 'changed()\n' } });
+  panel.fire({ v: 1, type: 'openLocation', evidenceId: 'e', requestId: 'plain1' });
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered');
+  assert.equal(openResults(panel)[0].outcome, 'blocked');
+  assert.equal(openResults(panel)[0].reason, 'changed');
+  assert.ok(warnings().includes('MLView: evidence e cites source.py, which changed after revision r1 was published; navigation to it is blocked.'));
+  // Without a requestId nothing is answered (the M1 and M2 opens send none).
+  panel.fire({ v: 1, type: 'openLocation', evidenceId: 'e2' });
+  await h.waitFor(() => shown().length === 1, 'the fresh file did not open');
+  assert.equal(openResults(panel).length, 1);
+});
+
+test('a removed notebook cell and unknown evidence are answered blocked without a notification from the walk', async () => {
+  const { panel, root } = await openNotebookPanel();
+  vscode.__setNotebooks([{ path: path.join(root, 'notes.ipynb'), cells: [{ text: 'a()' }] }]);
+  const before = warnings().length;
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered');
+  assert.equal(openResults(panel)[0].outcome, 'blocked');
+  assert.equal(openResults(panel)[0].reason, 'cell-missing');
+  assert.equal(openResults(panel)[0].message, 'Cell 1 of notes.ipynb no longer exists; not opened.');
+  walkOpen(panel, 'nope', 2);
+  await h.waitFor(() => openResults(panel).length === 2, 'the unknown evidence was not answered');
+  assert.equal(openResults(panel)[1].reason, 'unknown');
+  assert.equal(warnings().length, before);
+});
+
+test('the walk end clears the highlight and drops a walk open still on its way; dispose clears it too', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 1, 'the open did not highlight');
+  panel.fire({ v: 1, type: 'walk', state: 'end' });
+  assert.equal(vscode.__recorded.decorationTypes[0].disposed, true, 'the walk end cleared the highlight');
+  // Any other state is ignored.
+  walkOpen(panel, 'e2', 2);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 2, 'the next open did not highlight');
+  panel.fire({ v: 1, type: 'walk', state: 'paused' });
+  assert.equal(vscode.__recorded.decorationTypes[1].disposed, false);
+  panel.dispose();
+  assert.equal(vscode.__recorded.decorationTypes[1].disposed, true, 'closing the panel cleared the highlight');
+});
+
+test('the walk end drops a notebook open waiting for its cell editor', async () => {
+  const { panel } = await openNotebookPanel({ cellEditors: false });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.shownNotebooks.length === 1, 'the notebook open did not start');
+  panel.fire({ v: 1, type: 'walk', state: 'end' });
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered', 3000);
+  assert.equal(openResults(panel)[0].outcome, 'cancelled');
+});
+
+test('highlight: false selects and reveals the range without the decoration, and clears the previous one', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 1, 'the open did not highlight');
+  walkOpen(panel, 'e2', 2, { highlight: false });
+  await h.waitFor(() => shown().length === 2, 'the second open did not show');
+  assert.equal(vscode.__recorded.decorationTypes.length, 1, 'no new decoration');
+  assert.equal(vscode.__recorded.decorationTypes[0].disposed, true, 'the previous highlight is gone');
+  assert.deepEqual(range(shown()[1].editor.selection), [0, 0, 0, 'other()'.length]);
+});
+
+test('a new page numbers its opens from the start again', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  walkOpen(panel, 'e', 9);
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered');
+  panel.fire({ v: 1, type: 'ready' });
+  await h.tick();
+  walkOpen(panel, 'e2', 1);
+  await h.waitFor(() => openResults(panel).length === 2, 'the open from the new page was not answered');
+  assert.equal(openResults(panel)[1].outcome, 'done');
+});
+
+test('a new page drops a numbered open the old page started', async () => {
+  const { panel } = await openNotebookPanel({ cellEditors: false });
+  walkOpen(panel, 'e', 4);
+  await h.waitFor(() => vscode.__recorded.shownNotebooks.length === 1, 'the notebook open did not start');
+  // The webview was recreated (hidden and shown again, or reloaded) while the open waited.
+  panel.fire({ v: 1, type: 'ready' });
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered', 3000);
+  assert.equal(openResults(panel)[0].outcome, 'cancelled');
+});
+
+/** Count fs.promises.readFile calls for `file` while `run` runs (the bundle reads through live getters). */
+async function countReads(file, run) {
+  const original = fsp.readFile;
+  let reads = 0;
+  fsp.readFile = function (target, ...rest) {
+    if (String(target) === file) reads++;
+    return original.call(this, target, ...rest);
+  };
+  try {
+    await run();
+  } finally {
+    fsp.readFile = original;
+  }
+  return reads;
+}
+
+test('jump checks are cached per freshness version: one read for a fresh file, one validation for a stale one', async () => {
+  let validations = 0;
+  const validator = async (...args) => { validations++; return api.validateWorkflow(...args); };
+  const { document, files } = twoFiles();
+  const { panel, root } = await open({ raw: document, files: { ...files, 'source.py': 'changed()\n' }, validator });
+  assert.equal(validations, 1, 'one validation to display the revision');
+  const other = path.join(root, 'other.py');
+  let seq = 0;
+  const reads = await countReads(other, async () => {
+    for (let i = 1; i <= 4; i++) {
+      walkOpen(panel, 'e2', ++seq);
+      await h.waitFor(() => openResults(panel).length === seq, 'the fresh open was not answered');
+    }
+  });
+  assert.equal(reads, 1, 'four opens of an unchanged file read it once');
+  for (let i = 1; i <= 3; i++) {
+    walkOpen(panel, 'e', ++seq);
+    await h.waitFor(() => openResults(panel).length === seq, 'the stale open was not answered');
+    assert.equal(openResults(panel).at(-1).reason, 'changed');
+  }
+  assert.equal(validations, 2, 'three opens of a stale file ran one full validation');
+  // A watcher event starts a new freshness version: the next open checks again.
+  await h.diskEvent(panel, 'change', path.join(root, 'source.py'));
+  const afterEvent = validations;
+  walkOpen(panel, 'e', ++seq);
+  await h.waitFor(() => openResults(panel).length === seq, 'the open after the event was not answered');
+  assert.equal(validations, afterEvent + 1, 'the cache did not outlive the freshness version');
+  // A file rewritten with no watcher event has a new identity on disk: checked again, and blocked.
+  fs.writeFileSync(other, 'other()\n# edited\n');
+  walkOpen(panel, 'e2', ++seq);
+  await h.waitFor(() => openResults(panel).length === seq, 'the open of the rewritten file was not answered');
+  assert.equal(openResults(panel).at(-1).outcome, 'blocked');
+  assert.equal(openResults(panel).at(-1).reason, 'changed');
+});
+
+test('blocked-open wording names the file, the reason and that nothing was opened', () => {
+  assert.equal(api.blockedOpenText('changed', 'a.py', { revisionId: 'r2' }), 'a.py changed after revision r2 was published; not opened.');
+  assert.equal(api.blockedOpenText('too-large', 'a.py'), 'a.py has grown past the size MLView can check; not opened.');
+  assert.equal(api.blockedOpenText('elsewhere', 'a.py', { folder: './copy/' }), 'a.py is not in the workspace root; it is unchanged in ./copy/. Not opened.');
+  assert.equal(api.blockedOpenText('unsaved', 'a.py'), 'Unsaved changes in a.py no longer contain the cited lines; not opened. Save or revert the file.');
+  assert.equal(api.blockedOpenText('unchecked', 'a.py', { issue: 'bad' }), 'a.py could not be checked (bad); not opened.');
+});
diff --git a/webview/dist/mlview.js b/webview/dist/mlview.js
index f79d6be9..5f119be4 100644
--- a/webview/dist/mlview.js
+++ b/webview/dist/mlview.js
@@ -3,7 +3,7 @@
 `);return{text:r,title:d}}function Ui(t,e){if(!t)return null;let n=ld(t,e);if(n)return{state:"stale",text:n.text,title:n.title};if(!t.verification)return{state:"unverified",text:"Freshness not checked",title:"This revision was published without source hashes, so MLView cannot tell whether the cited files changed since."};let o=new Set((t.evidence||[]).map(i=>i.file)).size;return{state:"unchanged",text:o+(o===1?" cited file unchanged":" cited files unchanged"),title:"The "+(o===1?"file":o+" files")+" the quotes cite still match the hashes published with revision "+t.revision.id+". Unchanged means the quoted lines still exist as published; it does not mean they support the claims."}}function Xi(t,e){if(!(!t||typeof t!="object"||t.v!==1))switch(t.type){case"init":e.init(t.theme,t.capabilities);return;case"workflow":e.workflow(t.document);return;case"workflowError":{let n=Array.isArray(t.codes)?t.codes.filter(o=>typeof o=="string"):void 0;e.workflowStatus(n),e.hostNotice(typeof t.message=="string"?t.message:"",n);return}case"stale":e.stale(Ki(t.files));return;case"actionResult":e.actionResult(t);return;case"theme":e.theme(t.kind);return;case"revealNode":e.revealNode(t.nodeId,t.center!==!1);return;case"revealIssue":e.revealIssue(t.issueId);return;case"restoreState":e.restoreState(t.state);return;default:e.onUnknown(String(t.type))}}function Yi(t,e){return!t||typeof t!="object"?{...e,severities:e.severities.slice()}:{severities:Array.isArray(t.severities)?t.severities.slice():e.severities.slice(),query:typeof t.query=="string"?t.query:""}}var 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i=o;_(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),_(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),_(i,"pointerenter",()=>n.enterEdge(e)),_(i,"pointerleave",()=>n.leaveEdge(e)),_(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),_(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),_(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Cn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new hn;this.mountSerial=ps();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new kn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new xn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new Ln,this.canvasEl.appendChild(this.toasts.root),this.viewport=new yn(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Sl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new _n({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new In({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Sn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new 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this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=kr(this.index,this.collapsedSet),this.routes=Or(this.index,this.frameData,this.collapsedSet),this.labelPlan=hs(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?vn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=Xr({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,l)=>kl(s,r,l,n),wireEdge:(s,r)=>Ll(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,go(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=Yr(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(ml(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(gl(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return 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e=[];for(let n of this.index.graph.nodes||[])this.index.isGroup(n.id)&&e.push(n.id);return this.collapsedSet=new Set(e),this.relayout(),this.viewport.fitWhole(),this.host.afterCollapse(),this.host.announce("Overview: "+e.length+(e.length===1?" group":" groups")+" collapsed, whole diagram fitted."),e.length}expandAncestors(e){if(!this.index)return!1;let n=!1;for(let o of this.index.ancestors(e))this.collapsedSet.delete(o)&&(n=!0);return n&&this.relayout(),n}centerOnNode(e,n){if(!this.index||!this.frameData)return;let o=this.index.visibleRepresentative(e,this.collapsedSet),i=this.frameData.boxes.get(o);if(!i||(this.viewport.centerOn(i),!n))return;let s=this.nodeEls.get(o);s&&(s.classList.add("is-pulse"),setTimeout(()=>s.classList.remove("is-pulse"),700))}revealNode(e,n){if(!this.index||!this.frameData)return;let o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Fe){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else 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n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Hr(this.index,this.frameData,o,n):Uo(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Tl='button, [role="button"], a[href], select';function Rl(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var Tn=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(_(e,"keydown",o=>this.onKey(o))),this.disposers.push(_(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Tl),n=Rl(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function De(t,e=si()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Ol=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Hl=["svg","png","copy-svg"],Jf=0,Rn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Jf;this.button=ne("mlv-btn mlv-btn--icon mlv-btn--more","More actions"),this.button.title="More: legend, flow, fit, export, shortcuts",this.button.appendChild(D("more",16)),this.button.setAttribute("aria-haspopup","menu"),this.button.setAttribute("aria-expanded","false"),this.button.setAttribute("aria-controls",o),_(this.button,"click",s=>{s.preventDefault(),s.stopPropagation(),this.setOpen(!this.openState)}),_(this.button,"keydown",s=>{if(s.key==="Escape"){if(!this.openState)return;s.preventDefault(),s.stopPropagation(),this.setOpen(!1);return}s.key!=="ArrowDown"&&s.key!=="ArrowUp"||(s.preventDefault(),s.stopPropagation(),this.setOpen(!0),this.focusItem(s.key==="ArrowDown"?0:this.shown().length-1))}),this.panel=f("div","mlv-moremenu"),this.panel.id=o,this.panel.setAttribute("role","menu"),this.panel.setAttribute("aria-label","More actions"),this.panel.hidden=!0;for(let s of Ol){if(s.group){let l=g(this.panel,f("div","mlv-moremenu__sep"));l.setAttribute("role","separator"),l.setAttribute("data-sep-before",s.id)}let r=f("button","mlv-moremenu__item");r.type="button",r.tabIndex=-1,r.setAttribute("role",s.check?"menuitemcheckbox":"menuitem"),r.setAttribute("data-more-item",s.id),Hl.indexOf(s.id)>=0&&r.setAttribute("data-export-action",s.id),s.folded&&r.setAttribute("data-folded","1"),r.appendChild(D(s.icon,14)),g(r,f("span","mlv-moremenu__label",s.label)),s.id==="minimap"&&(g(r,f("span","mlv-moremenu__note")).hidden=!0),s.keys&&g(r,f("kbd","mlv-moremenu__keys",De(s.keys))).setAttribute("aria-hidden","true"),_(r,"click",l=>{if(l.preventDefault(),r.disabled)return;let a=l.detail===0;this.setOpen(!1),this.onPick(s.id,a)}),this.panel.appendChild(r),this.items.set(s.id,r)}_(this.panel,"keydown",s=>this.onKey(s));let i=typeof document>"u"?null:document;i&&(this.disposers.push(_(i,"pointerdown",s=>{if(!this.openState)return;let r=s.target;r&&(this.panel.contains(r)||this.button.contains(r))||this.setOpen(!1)})),this.disposers.push(_(i,"keydown",s=>{if(!this.openState||s.key!=="Escape")return;s.preventDefault(),s.stopPropagation();let r=i.activeElement,l=!!r&&(this.panel.contains(r)||this.button.contains(r));this.setOpen(!1),l&&this.focusButton()},!0)))}get open(){return this.openState}update(e){for(let[o,i]of this.items){let s=Ol.find(l=>l.id===o),r=!s.folded||(o==="search"?e.folded.search:o==="about"?e.folded.about:e.folded.exceptions);if(i.hidden=!r,o==="about"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.aboutLabel),i.title="Show About: the request, coverage, limitations and provenance"}if(o==="exceptions"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.exceptionsLabel),i.title=e.exceptionsOn?"The observed claims are faded; choose to show them again":"Fade the observed claims so these stand out"}if(o==="rail"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.railMode==="sheet"?"Bottom panel":"Side panel"),i.title=e.railMode==="sheet"?"Open or collapse the bottom panel":"Show or hide the side panel"}if(s.check){let l=o==="legend"?e.legendOpen:o==="flow"?e.flowOn:o==="minimap"?e.minimapShown&&!e.minimapUnavailable:o==="exceptions"?e.exceptionsOn:e.railOpen;i.setAttribute("aria-checked",l?"true":"false")}if(o==="minimap"){let l=i.querySelector(".mlv-moremenu__note");l&&(l.textContent=e.minimapUnavailable||"",l.hidden=!e.minimapUnavailable),i.disabled=!!e.minimapUnavailable,i.title=e.minimapUnavailable?"Overview map: "+e.minimapUnavailable.charAt(0).toLowerCase()+e.minimapUnavailable.slice(1):"Show or hide the overview map"}o==="zoomsel"&&(i.disabled=!e.hasSelection),Hl.indexOf(o)>=0&&(i.disabled=!e.canExport),i.disabled?i.setAttribute("aria-disabled","true"):i.removeAttribute("aria-disabled")}let n=this.shown()[0];for(let o of Array.from(this.panel.querySelectorAll(".mlv-moremenu__sep")))o.hidden=!!n&&o.getAttribute("data-sep-before")===n.getAttribute("data-more-item")}setOpen(e){if(this.openState!==e)if(this.openState=e,this.panel.hidden=!e,this.button.setAttribute("aria-expanded",e?"true":"false"),e){try{this.beforeOpen()}catch{}this.position(),this.focusItem(0)}else{let n=this.panel.ownerDocument?this.panel.ownerDocument.activeElement:null;n&&this.panel.contains(n)&&this.focusButton()}}shown(){return Array.from(this.items.values()).filter(e=>!e.hidden&&!e.disabled)}position(){let e=null;try{e=this.button.getBoundingClientRect()}catch{e=null}e&&(this.panel.style.position="fixed",this.panel.style.top=Math.round(e.bottom+4)+"px",this.panel.style.left="auto",this.panel.style.right=Math.max(8,Math.round(ep()-e.right))+"px")}focusItem(e){let n=this.shown();if(!n.length)return;let o=(e%n.length+n.length)%n.length;try{n[o].focus()}catch{}}focusButton(){try{this.button.focus()}catch{}}onKey(e){if(e.key==="Escape"){e.preventDefault(),e.stopPropagation(),this.setOpen(!1);return}if(e.key==="Tab"){this.setOpen(!1);return}let n=this.shown(),o=n.indexOf(e.target);if(!(o<0)){if(e.key==="ArrowDown")this.focusItem(o+1);else if(e.key==="ArrowUp")this.focusItem(o-1);else if(e.key==="Home")this.focusItem(0);else if(e.key==="End")this.focusItem(n.length-1);else return;e.preventDefault(),e.stopPropagation()}}destroy(){for(let e of this.disposers)try{e()}catch{}this.disposers=[]}};function ep(){try{if(typeof window<"u"&&window.innerWidth)return window.innerWidth}catch{}return 1280}var ri={mid:620,wide:1e3,full:1200};function tp(t){return t>0?tt+" "+(t===1?e:n);function Nl(t){let e=t.steps+t.connections+t.findings,n=[];return t.steps&&n.push(ke(t.steps,"step","steps")),t.connections&&n.push(ke(t.connections,"connection","connections")),t.findings&&n.push(ke(t.findings,"finding","findings")),e+" not observed ("+n.join(", ")+")"}function np(t){let e=t.coverage.limitations.length;return"Coverage: "+t.coverage.status+(e?" · "+ke(e,"limitation","limitations"):"")}var Pl=4;function op(t){let e=t.steps+t.connections+t.findings;return e+(e===1?" claim":" claims")+" not observed"}var ip=0,On=class{constructor(e,n){this.sevButtons=new Map;this.roving=null;this.layout="full";this.width=0;this.fitLevel=0;this.hasDocument=!1;this.hasExceptions=!1;this.sevShown=new Set;this.searchOpen=!1;this.lastAboutLabel="About this revision";this.state=null;this.cb=e;let o="mlv"+ ++ip;this.header=f("header","mlv-header"),this.header.setAttribute("data-layout",this.layout),this.title=g(this.header,f("h1","mlv-header__title","")),this.toolbar=g(this.header,f("div","mlv-header__bar")),this.toolbar.setAttribute("role","toolbar"),this.toolbar.setAttribute("aria-label","Diagram controls"),this.toolbar.setAttribute("aria-orientation","horizontal"),this.provenance=f("button","mlv-chip mlv-header__prov"),this.provenance.type="button",g(this.provenance,f("span","mlv-header__dot")).setAttribute("aria-hidden","true"),this.provHost=g(this.provenance,f("span","mlv-header__host","")),this.provRev=g(this.provenance,f("span","mlv-header__rev","")),_(this.provenance,"click",a=>e.onAbout(a.detail===0)),this.toolbar.appendChild(this.provenance),g(this.toolbar,f("span","mlv-header__spacer")),this.search=g(this.toolbar,f("div","mlv-search")),g(this.search,D("search",14)).setAttribute("class","mlv-uicon mlv-search__glyph");let s=g(this.search,f("label","mlv-sr","Search steps, findings, IDs, or cited text"));s.htmlFor=o+"-search-input",this.searchInput=g(this.search,f("input","mlv-input")),this.searchInput.id=o+"-search-input",this.searchInput.type="search",this.searchInput.placeholder="Search steps and findings",this.searchInput.setAttribute("role","combobox"),this.searchInput.setAttribute("aria-expanded","false"),this.searchInput.setAttribute("aria-controls",o+"-search-results"),this.searchInput.autocomplete="off",this.results=g(this.search,f("ul","mlv-search__results")),this.results.id=o+"-search-results",this.results.setAttribute("role","listbox"),this.results.setAttribute("aria-label","Search results"),this.results.hidden=!0,_(this.searchInput,"input",()=>e.onQuery(this.searchInput.value)),_(this.searchInput,"keydown",a=>e.onSearchKey(a)),_(this.searchInput,"blur",()=>{this.searchInput.value||this.setSearchOpen(!1)}),this.searchBtn=ne("mlv-btn mlv-btn--icon mlv-header__searchbtn","Search ("+De("Mod+F")+")"),this.searchBtn.appendChild(D("search",16)),this.searchBtn.setAttribute("aria-controls",this.searchInput.id),_(this.searchBtn,"click",()=>e.onSearchOpen()),this.toolbar.appendChild(this.searchBtn);for(let a of Z){let d=f("button","mlv-chip mlv-chip--btn mlv-chip--sev");d.type="button",d.setAttribute("aria-pressed","true"),d.setAttribute("data-severity",a),d.appendChild(U(a,14,"")),g(d,f("span","mlv-chip__count","0")),_(d,"click",()=>e.onSeverity(a)),this.sevButtons.set(a,d),this.toolbar.appendChild(d)}this.sevUnit=g(this.toolbar,f("span","mlv-header__unit","findings")),this.sevUnit.setAttribute("aria-hidden","true"),this.sevUnit.hidden=!0,this.exceptionsBtn=f("button","mlv-chip mlv-chip--btn mlv-chip--exceptions"),this.exceptionsBtn.type="button",this.exceptionsBtn.setAttribute("aria-pressed","false"),this.exceptionsBtn.hidden=!0,_(this.exceptionsBtn,"click",()=>e.onToggleExceptions(this.exceptionsBtn.getAttribute("aria-pressed")!=="true")),this.toolbar.appendChild(this.exceptionsBtn),this.more=new Rn((a,d)=>this.pick(a,d),()=>e.onMenuOpen()),this.toolbar.appendChild(this.more.button),this.refineSlot=g(this.toolbar,f("span","mlv-header__refine")),this.status=f("footer","mlv-status"),this.status.setAttribute("data-layout",this.layout),this.counts=g(this.status,f("span","mlv-status__counts","")),this.coverage=f("button","mlv-status__coverage"),this.coverage.type="button",this.coverage.hidden=!0,_(this.coverage,"click",a=>e.onAbout(a.detail===0)),this.status.appendChild(this.coverage),g(this.status,f("span","mlv-status__spacer")),this.fresh=g(this.status,f("span","mlv-status__freshness"));let r=ne("mlv-btn mlv-btn--icon mlv-zoom__btn","Zoom out");r.appendChild(D("minus",12)),_(r,"click",()=>e.onZoom(-1));let l=ne("mlv-btn mlv-btn--icon mlv-zoom__btn","Zoom in");l.appendChild(D("plus",12)),_(l,"click",()=>e.onZoom(1)),n.insertBefore(r,n.firstChild),n.appendChild(l),this.status.appendChild(n),this.roving=new Tn(this.toolbar)}destroy(){this.roving&&this.roving.destroy(),this.roving=null,this.more.destroy()}syncRoving(){this.fitRow()}setWidth(e){let n=tp(e),o=n!==this.layout;return o&&(this.layout=n,this.header.setAttribute("data-layout",n),this.status.setAttribute("data-layout",n),this.syncSearch()),(o||e!==this.width)&&(this.width=e,this.fitRow()),n}get headerFit(){return this.fitLevel}get headerLayout(){return this.layout}setSearchOpen(e){this.searchOpen=e,this.syncSearch(),this.fitRow()}syncSearch(){let n=!(this.layout==="mid"||this.layout==="narrow")||this.searchOpen||!!this.searchInput.value;this.header.setAttribute("data-search",n?"open":"closed"),this.searchBtn.setAttribute("aria-expanded",n?"true":"false"),this.syncControls()}syncControls(){this.provenance.hidden=!this.hasDocument||this.layout==="narrow"||this.fitLevel>=1;let e=(this.layout==="mid"||this.layout==="narrow")&&this.header.getAttribute("data-search")!=="open";this.searchBtn.hidden=!(this.layout==="mid"&&e),this.exceptionsBtn.hidden=!this.hasExceptions||this.fitLevel>=2;for(let[n,o]of this.sevButtons)o.hidden=!this.sevShown.has(n)||this.fitLevel>=4;this.sevUnit.hidden=this.sevShown.size===0||this.fitLevel>=4,this.header.setAttribute("data-fit",String(this.fitLevel))}fitRow(){this.fitLevel=0,this.syncControls();let e=this.header.clientWidth,n=this.header.getAttribute("data-search")==="open"&&(this.layout==="mid"||this.layout==="narrow")?Pl:Pl-1;if(e>0)for(;this.fitLevelthis.header.clientWidth;)this.fitLevel++,this.syncControls();this.updateMenu(),this.roving&&this.roving.sync()}updateMenu(){let e=this.state;if(!e)return;let n=e.notObserved,o=this.hasExceptions&&this.fitLevel>=2;this.more.update({folded:{search:this.layout==="narrow",about:this.layout==="narrow"||this.fitLevel>=1,exceptions:o},aboutLabel:this.lastAboutLabel,exceptionsLabel:this.hasExceptions?Nl(n):"",exceptionsOn:e.exceptionsOn,legendOpen:e.legendOpen,flowOn:e.flowOn,minimapShown:!e.minimapCollapsed,minimapUnavailable:e.minimapUnavailable,railOpen:e.railOpen,railMode:e.railMode,hasSelection:e.hasSelection,canExport:!!e.graph})}pick(e,n){let 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("+a+" high severity)":"")+".")}t.saveSoon()}function qn(t){if(!t.graph)return;let e=new Set(t.graph.nodes.map(o=>o.id)),n=t.collapsedState.filter(o=>!e.has(o));t.collapsedState=n.concat(Array.from(t.view.collapsed)).sort()}function ja(t){let e=_l(t.root,t.themes.kind);t.releasePage=El(t.root),t.liveEl=e.live,t.view=new Cn(e,$m(t)),t.chrome=new On({onQuery:n=>t.search.run(n),onSearchKey:n=>t.search.handleKey(n),onSearchOpen:()=>t.focusSearch(),onSeverity:n=>t.applyFilters(()=>t.filters.toggleSeverity(n)),onToggleExceptions:n=>t.setExceptions(n),onAbout:n=>t.showAbout({focus:n}),onZoom:n=>t.view.zoomStep(n),onToggleLegend:n=>t.setLegend(n),onToggleFlow:n=>t.setFlow(n),onToggleMinimap:n=>t.setMinimapCollapsed(n),onToggleRail:()=>t.toggleRail(),onFitWhole:()=>t.view.fitWhole(),onZoomToSelection:()=>t.zoomToSelection(),onExport:n=>Fa(t,n),onShortcuts:()=>t.toggleShortcuts(!0),onMenuOpen:()=>q(t)},e.zoomBar),t.root.appendChild(t.chrome.header),t.notice=new Gn({onWorkspaceHint:n=>t.bridge.post({v:1,type:"workspaceHint",action:n})}),t.root.appendChild(t.notice.root),t.root.appendChild(e.body),e.body.appendChild(e.main),t.search=new jn(t.chrome.searchInput,t.chrome.results,{index:()=>t.index,activate:n=>t.activateHit(n),onQueryChanged:n=>{t.filters.patch({query:n}),t.saveSoon()},blurToCanvas:()=>t.view.canvasEl.focus()}),t.rail=new Fn({onTab:n=>t.setRailTab(n),onClearFilters:()=>t.clearFilters(),onSelectIssue:(n,o)=>{t.focusIssue(n,{fromList:"issues"}),t.doubleClick.arm(o,()=>t.openIssue(n,!1))},onOpenIssue:(n,o)=>t.openIssue(n,o),onSelectNode:(n,o)=>{t.select({kind:"node",id:n},{center:!0,reveal:!0,fromList:"outline"}),t.doubleClick.arm(o,()=>t.select({kind:"node",id:n},{center:!0,reveal:!0,open:!0,fromList:"outline"}))},onOpenNode:(n,o)=>t.select({kind:"node",id:n},{center:!0,reveal:!0,open:!0,focusEditor:o,fromList:"outline"}),onSelectEdge:n=>t.select({kind:"edge",id:n},{reveal:!0,fromList:"outline"}),onShowNode:n=>t.focusNode(n,{center:!0,pulse:!0}),onShowEdge:n=>t.select({kind:"edge",id:n},{reveal:!0}),onShowIssue:n=>t.focusIssue(n),onChallenge:()=>Da(t,"challenge"),onRefine:()=>Da(t,null),onOpen:(n,o)=>t.openLocation(n,o),onResize:n=>t.setRailWidth(n),onSelectLane:n=>t.selectLane(n),onToggleCollapse:n=>{t.index&&t.index.isGroup(n)&&t.view.toggleCollapse(n)},onShowLimitations:()=>t.showAbout({at:"limitations",focus:!0}),onSheetToggle:()=>t.toggleRail(),onSheetCollapse:()=>t.collapseSheet(!0),onSheetResize:n=>t.setSheetFraction(n),sheetFraction:()=>t.sheetFraction,sheetFractionMax:()=>t.sheetFractionMax(),bodyHeight:()=>e.body.getBoundingClientRect().height}),e.body.appendChild(t.rail.root),_(t.rail.root,"pointerdown",()=>{t.railChosen=!0}),_(t.rail.root,"keydown",()=>{t.railChosen=!0}),t.legend=new Bn(n=>t.setLegend(n)),e.canvas.appendChild(t.legend.root),t.sheet=new Dn(()=>t.toggleShortcuts(!1)),t.root.appendChild(t.sheet.root),t.root.appendChild(t.chrome.more.panel),t.root.appendChild(t.chrome.status),t.root.appendChild(t.liveEl),t.setRailWidth(t.railWidth),t.setRailOpen(t.railOpen)}function $m(t){let e=(o,i)=>t.select({kind:"node",id:o},{showClaim:!0,open:!0,focusEditor:i}),n=(o,i)=>t.select({kind:"edge",id:o},{showClaim:!0,open:!0,focusEditor:i});return{keep:t.filters.keep,activateNode:(o,i)=>{t.select({kind:"node",id:o},{showClaim:!0}),t.doubleClick.arm(i,()=>e(o,!1))},activateEdge:(o,i)=>{t.select({kind:"edge",id:o},{showClaim:!0}),t.doubleClick.arm(i,()=>n(o,!1))},openNode:e,openEdge:n,clearFilters:()=>t.clearFilters(),announce:o=>t.announce(o),afterCollapse:()=>{qn(t),t.view.applySelection(t.selection),X(t),t.saveSoon()},onViewportChange:o=>{t.viewportState={x:o.x,y:o.y,zoom:o.zoom},t.saveSoon()},onMinimapCollapsed:()=>{q(t),t.saveSoon()},onKeyDown:o=>t.onKeyDown(o),onBackgroundClick:()=>t.clearSelection(),keptTarget:()=>{let o=t.selection;if(!o)return null;if(o.kind!=="issue")return{kind:o.kind,id:o.id};let i=t.index?t.index.issueById.get(o.id):void 0;return i?i.nodeIds[0]?{kind:"node",id:i.nodeIds[0]}:i.edgeIds.length?{kind:"edge",id:i.edgeIds[0]}:null:null}}}function Da(t,e){let n=t.root.querySelector(".mlv-workflow__refine"),o=t.root.querySelector(".mlv-workflow__composer"),i=t.root.querySelector(".mlv-workflow__intent");!n||!o||!i||(o.hidden||n.click(),n.click(),e&&(i.value=e,i.dispatchEvent(new Event("change",{bubbles:!0}))))}function Ga(t,e,n=!1){if(!t.caps.canOpenSource)return;let o=e.evidenceId?t.freshness.reasonOf(e.file):void 0;if(o){let r=e.file+": "+me[o]+". 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Math.max(Xa,Math.min(Ya,(n-o)/n))}setSheetFraction(e){let n=Math.max(Xa,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Fi?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),X(this),q(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&q(this),e&&this.rail&&X(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Fi>=280?n-Fi:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),q(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),q(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),X(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),n&&n.open){let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),X(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(hl()){let n=Kl(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),q(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),X(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){Wa(this,e)}onMessage(e){Ua(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return Ka(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.view.destroy(),this.releasePage(),H(this.root),this.root.classList.remove("mlv-root")}}};var Tt=null;function lg(){if(Tt)return Tt;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Tt=t.acquireVsCodeApi()}catch{Tt=null}return Tt}function ag(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function dg(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function Za(){let t=lg(),e={canOpenSource:!0};return{host:"vscode",theme:ag(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return dg(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var cg="0.3.0";function ug(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is required");let o=new Zn(t,n);return o.setWorkflow(e),o}var hg={vscode(){return Za()}};return nd(fg);})();
diff --git a/webview/src/types.ts b/webview/src/types.ts
index 172f370c..bf07668b 100644
--- a/webview/src/types.ts
+++ b/webview/src/types.ts
@@ -282,22 +282,36 @@ export interface Capabilities {
 export type RefineIntent = 'explain' | 'expand' | 'challenge' | 'trace' | 'custom';
 
 /** The requests that carry a `requestId` and are answered by one `actionResult`. */
-export type ResultAction = 'exportFile' | 'copy' | 'refineWorkflow';
+export type ResultAction = 'exportFile' | 'copy' | 'refineWorkflow' | 'openLocation';
 
 /**
- * The host's single answer to an `exportFile`, `copy` or `refineWorkflow`
- * request that carried a valid `requestId` (§1e). `message` is host-authored
+ * Why the host did not open a cited range (viewer M3): a stale reason, `elsewhere` (the root
+ * hint), unsaved text that lost the cited lines, a removed notebook cell, a file that could not be
+ * checked, or evidence the displayed revision does not have.
+ */
+export type OpenBlockReason = 'changed' | 'missing' | 'unreadable' | 'too-large' | 'elsewhere' | 'unsaved' | 'cell-missing' | 'unchecked' | 'unknown';
+
+/**
+ * The host's single answer to an `exportFile`, `copy`, `refineWorkflow` or (viewer M3)
+ * `openLocation` request that carried a valid `requestId` (§1e). `message` is host-authored
  * and never contains an absolute path; `name` is the saved basename and is sent
  * only for a completed export.
+ *
+ * For `openLocation`: `done` (shown beside the panel), `blocked` (not opened; `reason` and a short
+ * `message` such as "train.py changed after revision r3 was published; not opened."), `cancelled`
+ * (a later open, a new revision or a freshness change overtook it) or `failed` (VS Code could not
+ * show the file). `seq` repeats the request's own `seq` when it had one.
  */
 export interface ActionResult {
   v: 1;
   type: 'actionResult';
   requestId: string;
   action: ResultAction;
-  outcome: 'done' | 'cancelled' | 'failed';
+  outcome: 'done' | 'cancelled' | 'failed' | 'blocked';
   message?: string;
   name?: string;
+  reason?: OpenBlockReason;
+  seq?: number;
 }
 
 /**
@@ -342,8 +356,17 @@ export type UiToHost =
   /**
    * `focus: true` (viewer M1) is the explicit open-and-focus gesture (Alt+Enter, Alt+click); every
    * other open keeps the keyboard on the diagram.
+   *
+   * Viewer M3, for the review walk (the host side; the walk debounces its opens about 150 ms):
+   * `seq` is a positive integer that increases with every numbered open of a page (the host drops
+   * an open whose `seq` is not above the last one it saw, and one a later open overtook);
+   * `requestId` asks for one `actionResult`; `walk: true` marks an open from the walk, which never
+   * raises a VS Code notification when it is blocked (the reason comes back in the result
+   * instead); `highlight: false` selects the range without the whole-range decoration.
    */
-  | { v: 1; type: 'openLocation'; file: string; absFile: string; line: number; col: number; endLine: number; endCol: number; preview?: boolean; evidenceId?: string; cell?: number; focus?: boolean }
+  | { v: 1; type: 'openLocation'; file: string; absFile: string; line: number; col: number; endLine: number; endCol: number; preview?: boolean; evidenceId?: string; cell?: number; focus?: boolean; seq?: number; requestId?: string; walk?: boolean; highlight?: boolean }
+  /** Viewer M3: the review walk ended; the host clears the cited-range highlight and drops a walk open still on its way. */
+  | { v: 1; type: 'walk'; state: 'end' }
   /** Viewer M1: the workspace-root hint's two actions. The host owns the folder. */
   | { v: 1; type: 'workspaceHint'; action: 'add' | 'open' }
   /**
diff --git a/webview/src/ui/appkeys.ts b/webview/src/ui/appkeys.ts
index ca19a447..9059acea 100644
--- a/webview/src/ui/appkeys.ts
+++ b/webview/src/ui/appkeys.ts
@@ -65,7 +65,7 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
     dismissTopmost: () => {
       if (ctx.sheetOpen()) ctx.toggleShortcuts(false);
       // The panels that open over the diagram from the header, before anything on the canvas.
-      else if (ctx.closeHeaderPanels()) return;
+      else if (ctx.closeHeaderPanels()) return true;
       // The legend is a PANEL over the diagram, opened with `l` and closed with
       // its own [x] — and Escape is what a reader presses at a panel. It sits
       // above focus mode because it is the shallower thing on screen: dismissing
@@ -73,7 +73,7 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
       else if (ctx.legendOpen()) ctx.closeLegend();
       // Viewer M2: the open bottom panel collapses to its tab strip before anything on the canvas
       // is undone: the selection it shows stays selected.
-      else if (ctx.collapseSheet()) return;
+      else if (ctx.collapseSheet()) return true;
       else if (ctx.view().isFocusLocked) ctx.view().toggleFocusMode(ctx.selection());
       else if (ctx.selection()) {
         // A connection reached with `e` still holds DOM focus, and focus alone
@@ -82,7 +82,15 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
         // port and charge (MLV-R1-FLOW-011).
         ctx.view().blurFocusedEdge();
         ctx.clearSelection();
-      } else ctx.view().canvasEl.blur();
+      } else {
+        // Leave the canvas. Viewer M3: when the focus is already off it, there is nothing left for
+        // this Escape to do here, and the key goes on to VS Code.
+        const canvas = ctx.view().canvasEl;
+        const active = canvas.ownerDocument ? canvas.ownerDocument.activeElement : null;
+        if (!active || !canvas.contains(active)) return false;
+        canvas.blur();
+      }
+      return true;
     },
 
     visibleIssues: () => ctx.visibleIssues(),
diff --git a/webview/src/ui/commands.ts b/webview/src/ui/commands.ts
index e767ff52..7a2b297e 100644
--- a/webview/src/ui/commands.ts
+++ b/webview/src/ui/commands.ts
@@ -12,8 +12,8 @@ import type { Issue, RailTab, Sel, Severity } from '../types.js';
 /** The operations the keyboard is allowed to reach. Implemented by App. */
 export interface CommandPort {
   focusSearch(): void;
-  /** Escape's cascade, innermost first. Returns once something was dismissed. */
-  dismissTopmost(): void;
+  /** Escape's cascade, innermost first. Returns once something was dismissed; false when nothing was. */
+  dismissTopmost(): boolean;
   visibleIssues(): Issue[];
   selectedIssueId(): string | null;
   focusIssue(id: string): void;
diff --git a/webview/src/ui/keymap.ts b/webview/src/ui/keymap.ts
index e67accd9..c69e781f 100644
--- a/webview/src/ui/keymap.ts
+++ b/webview/src/ui/keymap.ts
@@ -12,7 +12,8 @@
 
 export interface KeyCommands {
   focusSearch(): void;
-  escape(): void;
+  /** The Escape cascade; false when nothing was left to dismiss, so the key is not consumed. */
+  escape(): boolean;
   cycleIssue(backwards: boolean): boolean;
   zoom(direction: number): void;
   /** `0`: the readable view (viewer M2), the first paint again. */
@@ -134,8 +135,12 @@ export function handleCanvasKey(ev: KeyboardEvent, cmd: KeyCommands): boolean {
     cmd.toggleShortcuts();
     return consume();
   }
+  // Viewer M3: an Escape that dismissed nothing (the focus is already off the canvas and nothing is
+  // open or selected) is left unconsumed, so VS Code can use it, for example to hide a notification.
+  // An Escape the cascade used is consumed, and the panel's bootstrap then keeps VS Code from also
+  // acting on it.
   if (key === 'Escape') {
-    cmd.escape();
+    if (!cmd.escape()) return false;
     return consume();
   }
   if (key === 'n' || key === 'N' || key === 'p' || key === 'P') {
diff --git a/webview/src/ui/searchcontroller.ts b/webview/src/ui/searchcontroller.ts
index 89fb198a..dd156ee6 100644
--- a/webview/src/ui/searchcontroller.ts
+++ b/webview/src/ui/searchcontroller.ts
@@ -85,6 +85,8 @@ export class SearchController {
 
   handleKey(ev: KeyboardEvent): void {
     if (ev.key === 'Escape') {
+      // Viewer M3: marked handled, so the panel's bootstrap keeps VS Code from also acting on it.
+      ev.preventDefault();
       this.clear();
       this.host.onQueryChanged('');
       this.host.blurToCanvas();
diff --git a/webview/test/authored-handshake.mjs b/webview/test/authored-handshake.mjs
index c0a36d43..c061ed6b 100644
--- a/webview/test/authored-handshake.mjs
+++ b/webview/test/authored-handshake.mjs
@@ -98,8 +98,12 @@ async function openWire(document, files) {
   return wire;
 }
 
-/** Load the panel's HTML as a fresh webview page: the built bundle, then the host's inline bootstrap. */
-function mountPage(wire) {
+/**
+ * Load the panel's HTML as a fresh webview page: the built bundle, then the host's inline bootstrap.
+ * `beforeScripts(window)` runs first, the way VS Code's webview host attaches its own listeners to
+ * the page's window before the page's scripts run.
+ */
+function mountPage(wire, beforeScripts) {
   const dom = new JSDOM(wire.panel.webview.html, {
     runScripts: 'outside-only', pretendToBeVisual: true,
     url: 'https://authored.mlview.test/', virtualConsole: new VirtualConsole()
@@ -122,6 +126,7 @@ function mountPage(wire) {
     setState: (value) => { wire.state = value; },
     getState: () => wire.state
   });
+  if (beforeScripts) beforeScripts(window);
   // These are MLView's trusted built bundle and host-generated bootstrap, never target source.
   // Strict eval scopes `var`; a real script element exposes the IIFE global.
   window.eval(BUNDLE + '\nwindow.MLView = MLView;');
@@ -408,3 +413,64 @@ export async function authoredStaleHandshake() {
     rmSync(wire.root, { recursive: true, force: true });
   }
 }
+
+/**
+ * Viewer M3: one Escape, one action. VS Code's webview host forwards every keydown to the
+ * workbench from a listener on the page's window, attached before the page's scripts run (checked
+ * live with DOMDebugger.getEventListeners in VS Code 1.139), and the workbench runs any Escape
+ * keybinding that matches (MEASURED live: one Escape on a card collapsed the bottom sheet and also
+ * dismissed a VS Code notification). The page here is the real host bootstrap plus the built
+ * viewer, with a stand-in forwarder attached first, as VS Code's is. An Escape the viewer acted on
+ * never reaches it; an Escape with nothing left to dismiss does, and so does every other key.
+ */
+export async function authoredEscapeHandshake() {
+  const wire = await openWire(baseDocument(), { 'source.py': SOURCE });
+  try {
+    const forwarded = [];
+    const page = mountPage(wire, (win) => win.addEventListener('keydown', (ev) => forwarded.push(ev.key)));
+    await waitFor(() => $(page, '[data-node-id="loss"]'), 'the viewer did not mount');
+    const { window } = page;
+    const press = (target, key) => {
+      const event = new window.KeyboardEvent('keydown', { key, bubbles: true, cancelable: true });
+      target.dispatchEvent(event);
+      return event;
+    };
+    const card = $(page, '[data-node-id="loss"]');
+    card.dispatchEvent(new window.MouseEvent('click', { bubbles: true, cancelable: true, detail: 1 }));
+    await waitFor(() => page.app.selection && page.app.selection.id === 'loss', 'the click did not select the card');
+    card.focus();
+    assert.equal(window.document.activeElement, card);
+
+    press(card, 'l');
+    assert.equal(page.app.legendOpen, true, 'l opened the legend');
+    assert.deepEqual(forwarded, ['l'], 'a key other than Escape still reaches VS Code');
+
+    let event = press(card, 'Escape');
+    assert.equal(page.app.legendOpen, false, 'Escape closed the legend');
+    assert.equal(event.defaultPrevented, true);
+    event = press(card, 'Escape');
+    assert.equal(page.app.selection, null, 'the next Escape cleared the selection');
+    assert.deepEqual(forwarded, ['l'], 'neither Escape the viewer used reached VS Code');
+
+    // Escape in the search box clears it and returns to the diagram; VS Code does not see it either.
+    const search = $(page, 'input[type="search"]');
+    search.focus();
+    search.value = 'loss';
+    search.dispatchEvent(new window.Event('input', { bubbles: true }));
+    event = press(search, 'Escape');
+    assert.equal(event.defaultPrevented, true, 'the search box used the Escape');
+    assert.equal(search.value, '', 'and cleared the query');
+    assert.deepEqual(forwarded, ['l'], 'the search box Escape did not reach VS Code');
+
+    // Nothing open, nothing selected and the focus off the canvas: nothing left for the viewer.
+    window.document.activeElement.blur();
+    event = press(window.document.body, 'Escape');
+    assert.equal(event.defaultPrevented, false, 'an Escape with nothing to dismiss is left unconsumed');
+    assert.deepEqual(forwarded, ['l', 'Escape'], 'and it reaches VS Code');
+    process.stdout.write('  PASS  an Escape the viewer used stops at the page; one with nothing to dismiss reaches VS Code\n');
+  } finally {
+    wire.controller.dispose();
+    for (const page of wire.pages) page.window.close();
+    rmSync(wire.root, { recursive: true, force: true });
+  }
+}
diff --git a/webview/test/authored-integration.test.mjs b/webview/test/authored-integration.test.mjs
index 48123ece..6aafc425 100644
--- a/webview/test/authored-integration.test.mjs
+++ b/webview/test/authored-integration.test.mjs
@@ -1,5 +1,5 @@
 import test from 'node:test';
-import { authoredHandshake, authoredStaleHandshake } from './authored-handshake.mjs';
+import { authoredEscapeHandshake, authoredHandshake, authoredStaleHandshake } from './authored-handshake.mjs';
 
 test('authored VS Code handshake supports citations, refinement, export, remount and watched revisions', async () => {
   await authoredHandshake();
@@ -8,3 +8,7 @@ test('authored VS Code handshake supports citations, refinement, export, remount
 test('authored VS Code handshake shows a stale revision as historical inside the mounted root', async () => {
   await authoredStaleHandshake();
 });
+
+test('an Escape the viewer acted on stops at the page instead of also reaching VS Code', async () => {
+  await authoredEscapeHandshake();
+});

From 8f3b7d09ec1f135da3995c676cd75b7a9d679108 Mon Sep 17 00:00:00 2001
From: realmyang 
Date: Fri, 2 Oct 2026 20:10:21 +0200
Subject: [PATCH 02/16] Viewer M3 step 12: document the host side of the walk,
 Escape and notebook load

A new CHANGELOG section for viewer M3, a STATUS paragraph, the protocol
notes in webview/README.md, Escape and the jump cache in the extension
README and LLM_WORKFLOW.md, and a dated PERFORMANCE section with the
notebook-jump profiles (single runs in an isolated VS Code 1.139 EDH).

Co-Authored-By: Claude Opus 5.5 
---
 CHANGELOG.md               | 71 ++++++++++++++++++++++++++++++++++++++
 docs/LLM_WORKFLOW.md       |  5 ++-
 docs/PERFORMANCE.md        | 37 ++++++++++++++++++++
 docs/STATUS.md             | 22 ++++++++++++
 vscode-extension/README.md |  9 +++++
 webview/README.md          | 50 ++++++++++++++++++++++++++-
 6 files changed, 192 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 741ce797..1468bed2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,77 @@ static analyzer; their figures are historical and are not rewritten. Current
 truth lives in [docs/STATUS.md](docs/STATUS.md) and
 [docs/VALIDATION.md](docs/VALIDATION.md).
 
+## Unreleased — viewer M3: review walk and the way back
+
+The viewer's third milestone, in progress. This part is the host side of the
+review walk (roadmap step 12), a fix for Escape, and a look at the cost of
+jumping through a large notebook. The walk itself, which steps through the
+diagram's claims and opens each one's source, comes in a later step; until
+then nothing here changes what a reader sees except Escape and less work on
+repeated notebook jumps. Checked by local jsdom and mock `vscode` tests
+(mutation-checked against the fixes) and in an isolated VS Code 1.139 Extension
+Development Host on macOS driven over the DevTools protocol. Not tried on
+Windows or Linux, with a screen reader or as a usability check. No contract
+change, no new setting, no geometry change, and the version is unchanged.
+
+Opening a cited range for the walk (`openLocation`, no change for Enter,
+double-click or an Open link):
+- An open can carry a sequence number (`seq`), a request id, `walk: true` and
+  `highlight: false`. The host drops an open whose number is not above the
+  last one it saw, and one a later open overtook while it waited (for example
+  for a notebook cell's editor). A new page starts the numbering again. The
+  walk is expected to wait about 150 ms after the reader stops moving before
+  it asks for a jump; that pause belongs to the walk step and is not in the
+  viewer yet.
+- Each open with a request id gets one answer: done, blocked, cancelled or
+  failed. A blocked answer names the reason and says nothing was
+  opened, for example "vit_pytorch/efficient.py changed after revision
+  cats-dogs-r1 was published; not opened." A changed, missing, unreadable or
+  oversized file, a file in another folder, unsaved text that lost the cited
+  lines, or a notebook cell that no longer exists is never opened.
+- A blocked walk open raises no VS Code notification, since the walk shows the
+  reason itself. A blocked open from Enter, a double-click or an Open link
+  still shows its notification, as before.
+- A new message tells the host the walk ended: it clears the cited-range
+  highlight, including its mark in the editor's overview ruler, and drops a
+  walk open still on its way. Closing the panel also clears the highlight.
+- The check behind each jump is cached for the displayed revision and
+  freshness. On a synthetic 200-cell, 3.8 MB notebook, 60 cell jumps hashed
+  the notebook once instead of 60 times, and the extension host was busy for
+  310 ms instead of 466 ms over the 12 s run. A file that changes on disk is
+  checked again on the next jump, even before VS Code reports the change.
+
+Escape:
+- An Escape the viewer used (closing the menu, the shortcut sheet, the Refine
+  popover or the legend, collapsing the bottom panel, leaving focus mode,
+  clearing the selection or the search) no longer also reaches VS Code. VS
+  Code's webview forwards every key to the workbench, even one the page has
+  handled, so a viewer Escape also hid a visible notification, which was
+  measured live. The panel now stops such an Escape inside the page.
+- When nothing is left to close and the focus is already off the diagram,
+  Escape is left to VS Code, for example to hide a notification.
+- The M2 report of the diagram losing focus when Escape followed an Enter that
+  opened a notebook (vit-cc, the diagram alone at about 1430 px) was not
+  reproduced in 14 live attempts, with waits from 150 ms to 7 s and a
+  notification on screen. The fix above removes the one way found for a
+  viewer Escape to act in VS Code as well; whether it was the cause of that
+  report is not confirmed. After the fix, the same steps keep the focus in
+  the diagram, nothing is forwarded, and the notification stays. Live, with
+  a warning notification on screen, Escape in the search box cleared it and
+  returned to the diagram, the next two cleared the selection and left the
+  diagram, all with the notification still up, and only the fourth reached VS
+  Code and hid it.
+
+Notebook load (measured, see [docs/PERFORMANCE.md](docs/PERFORMANCE.md)):
+- Over 60 paced cell jumps MLView's own code used about 40 ms of extension
+  host CPU before and after the cache; the cache removed the 93 ms spent
+  hashing the notebook again on every jump.
+- Creating 2,000 files in the workspace called MLView's file watcher 1,157
+  times for about 6 ms in total. The watcher adds no operating-system watcher
+  and must see every cited file, so it was not narrowed.
+- With Pylance running, the extra time was outside MLView's code. These runs
+  cannot attribute it more finely, and no freeze was reproduced.
+
 ## Unreleased — viewer M2: readable at your width
 
 The viewer's second milestone: a diagram you can read in the panel beside your
diff --git a/docs/LLM_WORKFLOW.md b/docs/LLM_WORKFLOW.md
index f062d5c1..3176d5d2 100644
--- a/docs/LLM_WORKFLOW.md
+++ b/docs/LLM_WORKFLOW.md
@@ -207,7 +207,10 @@ a panel 900 px wide or narrower, a diagram under 350 px tall, or with fewer
 than 30 cards. Ctrl+F (Cmd+F on macOS), or `/` on the diagram, focuses
 search; the viewer's other keys are single keys, so VS Code's own Ctrl and Cmd
 shortcuts keep working, and the shortcut sheet prints them for your platform.
-Each search result shows its
+Escape closes one thing at a time in the viewer (a menu or panel, the bottom
+sheet, focus mode, the selection, then the focus on the diagram) without VS
+Code also acting on it; after that it goes to VS Code, for example to hide a
+notification. Each search result shows its
 title and, under it, where it is cited. The status bar counts steps and
 connections, shows the coverage status with its limitations, and says
 whether the cited files are unchanged (muted text) or changed or missing (a
diff --git a/docs/PERFORMANCE.md b/docs/PERFORMANCE.md
index a4176061..a4cf7b74 100644
--- a/docs/PERFORMANCE.md
+++ b/docs/PERFORMANCE.md
@@ -158,3 +158,40 @@ limits timing precision. Its different Chromium version, host capabilities and
 much narrower viewport mean these values and DOM counts cannot be compared
 directly with the standalone Chrome table. The heap samples are live JavaScript
 heap snapshots, not total or peak process memory.
+
+## Notebook cell jumps in VS Code (viewer M3, 2026-10-02)
+
+A synthetic notebook (200 cells, 171 of them code with outputs, 3,826,440
+bytes) and a diagram citing 60 of its cells were opened in an isolated VS Code
+1.139.0 Extension Development Host on macOS. A script sent 60 cell jumps
+through the viewer's bridge over the DevTools protocol, either one every
+150 ms ("paced") or all at once ("burst"), and recorded a CPU profile of the
+extension host and of the workbench renderer (0.5 ms sampling). These are
+single runs on one machine: read them as an attribution of costs, not as a
+budget.
+
+| Run | Extension host busy | MLView's own code | Hashing the notebook | Garbage collection |
+|---|---:|---:|---:|---:|
+| Paced, before the jump cache | 466 ms of 12.1 s | 36 ms | 93 ms (60 reads) | 45 ms |
+| Paced, with the jump cache | 310 ms of 12.1 s | 45 ms | 1.3 ms (1 read) | 11 ms |
+| Burst, before the jump cache | 206 ms of 3.2 s | 11 ms | 101 ms | 22 ms |
+| Burst, with the jump cache | 70 ms of 3.2 s | 13 ms | none sampled | under 1 ms |
+
+"Busy" is the profile's time not spent idle. Before the cache every jump
+hashed the whole notebook again to prove it unchanged; now the first jump
+hashes it once and later jumps compare the file's size, inode and times. In a burst the host opens only the last jump, and a jump a later one
+has overtaken now stops before it reads the file.
+
+The workbench renderer was busy for about 2.2 to 2.3 s of each 12 s paced run
+(VS Code's own notebook and editor code); MLView runs no code there outside
+its webview. Creating 2,000 files in the workspace called MLView's
+file-watcher listener 1,157 times, about 1 ms of MLView code and 5 ms of path
+handling in total. The watcher (`**/*`) shares VS Code's own workspace
+watching and adds no operating-system watcher, and it has to see every cited
+or inspected file, whatever its name, so it was left as it is.
+
+With Pylance 2026.4.1 installed and a Python language server running, the same
+paced run spent 42 ms in MLView's code and 528 ms busy in the extension host;
+the renderer was busy for 2.6 s. The extra time is outside MLView's code (in
+Pylance, VS Code's messaging and the workbench); these runs cannot divide it
+further. No freeze was reproduced.
diff --git a/docs/STATUS.md b/docs/STATUS.md
index 9908ec73..947c161c 100644
--- a/docs/STATUS.md
+++ b/docs/STATUS.md
@@ -143,6 +143,28 @@ the hint's and VS Code's Add Folder, Save Workspace As, Restart Extension Host,
 Reload Window and the multi-root case; an extension install or update was not
 tried ([changelog](../CHANGELOG.md)).
 
+Unreleased viewer M3, step 12 (the host side of the review walk) and Escape:
+an `openLocation` request may carry a sequence number, a request id, a walk
+flag and `highlight: false`. The host drops an open a later one has
+overtaken, answers a request id with done, blocked (with the reason, for
+example "train.py changed after revision r3 was published; not opened."),
+cancelled or failed, and never opens a changed, missing or otherwise stale
+file. A blocked walk open raises no VS Code notification; one from Enter, a
+double-click or an Open link still does. A `walk` end message clears the
+cited-range highlight and its overview-ruler mark, as closing the panel does.
+The check behind a jump is cached per revision and freshness: 60 jumps into a
+synthetic 3.8 MB notebook hashed it once instead of 60 times
+([performance](PERFORMANCE.md)). The walk itself (step 11) is not in the
+viewer yet. An Escape the viewer used no longer also reaches VS Code (where
+it hid a notification); with nothing left to close and the focus off the
+diagram, Escape goes to VS Code. The M2 report of focus lost on Escape after
+Enter opened a notebook was not reproduced in 14 live attempts, so this fixes
+the mechanism found, not a confirmed reproduction. No contract change, no new
+setting and no geometry change. Checked by local jsdom and mock `vscode`
+tests and in an isolated VS Code 1.139 Extension Development Host on macOS
+driven over the DevTools protocol; not on Windows or Linux, with a screen
+reader or as a usability check ([changelog](../CHANGELOG.md)).
+
 Unreleased viewer M2, live-check fixes: a live check of the branch found
 seven problems, now fixed. When the panel resizes or the rail changes shape
 and a selection that was in view no longer is, the diagram pans the least
diff --git a/vscode-extension/README.md b/vscode-extension/README.md
index 720e1f6b..d3c10c66 100644
--- a/vscode-extension/README.md
+++ b/vscode-extension/README.md
@@ -74,6 +74,10 @@ focus to the editor. For a notebook citation the cell is selected and
 revealed; its lines are highlighted when VS Code has the cell's editor ready.
 In High Contrast themes the highlighted lines are outlined with the theme's
 range-highlight border, since those themes define no highlight background.
+The highlight also marks the editor's overview ruler. MLView checks a cited
+file once per revision and freshness check: later jumps into it read it again
+only after it changes on disk, so stepping through the cells of a large
+notebook does not re-read the whole notebook each time.
 Only inferred (dashed, `inferred` tag) and unresolved (dotted, `? unresolved`
 tag) steps and connections are marked; observed ones carry no mark, and the
 header's **N not observed** toggle fades them. Line style shows certainty,
@@ -96,6 +100,11 @@ The overview map item is disabled, with the reason, when the map is not drawn
 (at 900 px wide or narrower, under 350 px tall, or below 30 cards). The
 viewer's other keys are single keys, so VS Code's Ctrl and Cmd shortcuts are
 left alone; the shortcut sheet prints the keys for your platform.
+Escape in the diagram closes the topmost thing (the menu, the shortcut sheet,
+the Refine popover, the legend, the open bottom panel, focus mode, the
+selection) or clears the search, and VS Code does not also act on that key
+press. Once nothing is left to close and the focus is off the diagram, Escape
+goes to VS Code, for example to hide a notification.
 The status bar reads, for example, "31 steps · 41 connections",
 "Coverage: scoped · 6 limitations" (which opens About), the source
 freshness, and the zoom.
diff --git a/webview/README.md b/webview/README.md
index c3f69b75..3f7bef90 100644
--- a/webview/README.md
+++ b/webview/README.md
@@ -329,6 +329,53 @@ byte-identical):
 - `test/m2-live.test.mjs` holds the regression tests for fixes 1, 4, 5, 6
   and 7; the hue test for fix 3 is in `test/calm-canvas.test.mjs`.
 
+Viewer M3 review walk, host side, and Escape (no contract change, no new
+setting; the golden is byte-identical):
+
+- `openLocation` takes four optional fields (`UiToHost` in `src/types.ts`):
+  `seq`, a positive integer that increases with every numbered open of a
+  page; `requestId`, which asks for one `actionResult`; `walk: true`, an open
+  from the review walk; and `highlight: false`, which selects the range
+  without the whole-range highlight. Opens without them behave as in M2.
+- The host drops a numbered open whose `seq` is not above the last one it saw
+  on this page (answered `cancelled`), and an open a later open overtook while
+  it waited (a notebook's cell editor, for example). A new page (`ready`)
+  starts the numbering again. The walk itself (step 11) should send a jump
+  only after the reader has stopped moving for about 150 ms; that debounce is
+  not in the viewer yet.
+- `actionResult` answers `openLocation` too: `done`, `blocked` (not opened,
+  with `reason` and a short `message` such as "train.py changed after
+  revision r3 was published; not opened."), `cancelled` or `failed`. It
+  repeats the request's `seq`. `reason` is one of `changed`, `missing`,
+  `unreadable`, `too-large`, `elsewhere`, `unsaved`, `cell-missing`,
+  `unchecked` or `unknown` (`OpenBlockReason`). The message never holds an
+  absolute path.
+- A blocked walk open raises no VS Code notification; the reason is only in
+  the result. A blocked open from Enter, a double-click or an Open link still
+  shows the M2 warning notification, and is answered as well when it carried
+  a `requestId`.
+- `{ type: 'walk', state: 'end' }` is new: the walk ended, so the host clears
+  the cited-range highlight (and its overview-ruler mark) and drops a walk open
+  still waiting. Closing the panel clears it too.
+- The checks behind a jump are cached per revision and freshness version, keyed
+  by each cited file's device, inode, size, and modification and change times
+  (`checkCitedFile` in `vscode-extension/src/authoredPanel.ts`). The first jump
+  into a file hashes that file once; later jumps into it read no file content
+  while those stay the same. A file whose stat changed without a watcher event
+  is checked again.
+- Escape: `KeyCommands.escape()` returns whether the cascade did anything.
+  When the focus is already off the canvas and nothing is open or selected,
+  `handleCanvasKey` leaves Escape unconsumed so VS Code can use it (for
+  example to hide a notification). VS Code's webview host forwards every
+  keydown to the workbench, even one the page called `preventDefault()` on,
+  and its window listener runs before any page script. So after the mount
+  the panel's bootstrap (`render()` in `vscode-extension/src/authoredPanel.ts`)
+  adds a document-level keydown listener that stops an Escape the viewer
+  already handled (`defaultPrevented`) before it reaches that window
+  listener. The search box's Escape (`SearchController.handleKey`) is marked
+  handled too. `authoredEscapeHandshake` in `test/authored-handshake.mjs` pins
+  both with a stand-in forwarder attached before the scripts.
+
 Viewer M1 cleanup (no contract change):
 
 - The bundle contains only the authored path. Inbound, the viewer handles
@@ -337,7 +384,8 @@ Viewer M1 cleanup (no contract change):
   Diagram") and `restoreState` (the tests drive collapse with it); any other
   type is answered with a `log` frame and ignored. Outbound it posts
   `openLocation`, `workspaceHint`, `refineWorkflow`, `copy`, `exportFile` and
-  `log`; the host bootstrap posts `ready`.
+  `log` (viewer M3 adds `walk` to the protocol for the review walk; the viewer
+  does not send it yet); the host bootstrap posts `ready`.
 - A saved `ViewState` with keys the viewer no longer writes (for example
   `showSuppressed` or `railGroupBy`) still loads; those keys are ignored.
 - `MLGraph` carries only what an authored document fills in. Fields of the

From 279aca263cbfa997b490809299c16dfd2e0c58b0 Mon Sep 17 00:00:00 2001
From: realmyang 
Date: Fri, 2 Oct 2026 21:23:40 +0200
Subject: [PATCH 03/16] Viewer M3 step 11: the claim-by-claim review walk

r (or the header's Review button, or Review the claims in the ... menu)
walks the displayed revision in the diagram's drawn order: each step, its
outgoing connections, then the findings whose first cited step it is.
Findings that cite no step come last, in document order (the roadmap is
silent on them). Every claim is visited once: 79 in vit-cc, 176 in
yolov5-cc2.

- Filters with counts: Not observed (default, the header's count),
  Findings, Changed files (only while the host reports changed or missing
  cited files) and All.
- Keys: j/k and Down/Up step while walking, [ and ] change quote, Enter
  opens again, u/Shift+U go through the claims not observed, n/p follow the
  walk's order; r or Escape ends it (a rung of the Escape cascade before the
  bottom sheet). No Ctrl/Cmd keys; outside the walk nothing changes.
- Each step selects and reveals the claim, shows it in Selection, and after
  150 ms asks the host to open its quote beside the panel (walk, seq,
  requestId; focus kept). Only the latest answer is shown; a blocked one
  puts its reason in the walk bar and under the quote, with no
  notification. A claim with nothing to open sends walk clear.
- The walk bar sits at the foot of the diagram column, above the bottom
  sheet, so the canvas stays within four Tab stops; below 620 px it is
  "3/16", the filters and Exit.
- The place is kept per revision in ViewState.walk; nothing is a verdict.
  The stale notice offers "Review affected claims".
- Host: walk clear clears the highlight; a blocked walk open clears the
  previous claim's highlight.

Tests: test/walk.test.mjs (synthetic vit-cc and yolov5-cc2 shapes),
authoredWalkHandshake (real host with the built bundle), host tests, and
deliberate updates to the header tests for the new row button, menu item
and shortcut rows. Golden unchanged.

Co-Authored-By: Claude Opus 5.5 
---
 vscode-extension/media/mlview.css          |   2 +-
 vscode-extension/media/mlview.js           |  14 +-
 vscode-extension/src/authoredPanel.ts      |  19 +-
 vscode-extension/test/walk-host.test.js    |  48 ++
 webview/dist/mlview.css                    |   2 +-
 webview/dist/mlview.js                     |  14 +-
 webview/src/app.ts                         | 142 +++-
 webview/src/app/actions.ts                 |  42 +-
 webview/src/app/build.ts                   |  55 +-
 webview/src/app/keys.ts                    |   8 +
 webview/src/app/state.ts                   |   3 +
 webview/src/app/surfaces.ts                |  11 +-
 webview/src/app/walk.ts                    | 562 ++++++++++++++
 webview/src/canvasview.ts                  |  17 +
 webview/src/icons.ts                       |   2 +
 webview/src/styles/export.css              |   1 +
 webview/src/styles/workflow.css            | 138 ++++
 webview/src/types.ts                       |  26 +-
 webview/src/ui/appkeys.ts                  |  22 +-
 webview/src/ui/chrome.ts                   |  46 +-
 webview/src/ui/commands.ts                 |  15 +
 webview/src/ui/hostnotice.ts               |  37 +
 webview/src/ui/keymap.ts                   |  47 +-
 webview/src/ui/moremenu.ts                 |  18 +-
 webview/src/ui/rail.ts                     |   4 +
 webview/src/ui/selection.ts                |  48 ++
 webview/src/ui/walkbar.ts                  | 194 +++++
 webview/src/walk.ts                        | 299 ++++++++
 webview/test/authored-handshake.mjs        | 121 +++
 webview/test/authored-integration.test.mjs |   6 +-
 webview/test/header-m2.test.mjs            |  29 +-
 webview/test/m2-review.test.mjs            |   2 +
 webview/test/walk.test.mjs                 | 841 +++++++++++++++++++++
 33 files changed, 2759 insertions(+), 76 deletions(-)
 create mode 100644 webview/src/app/walk.ts
 create mode 100644 webview/src/ui/walkbar.ts
 create mode 100644 webview/src/walk.ts
 create mode 100644 webview/test/walk.test.mjs

diff --git a/vscode-extension/media/mlview.css b/vscode-extension/media/mlview.css
index 18b4e882..f0e21e3e 100644
--- a/vscode-extension/media/mlview.css
+++ b/vscode-extension/media/mlview.css
@@ -1 +1 @@
-:root,.mlv-root[data-theme=light]{--mlv-font: var(--vscode-font-family, ui-sans-serif, -apple-system, "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif);--mlv-font-mono: var(--vscode-editor-font-family, "Cascadia Code", "JetBrains Mono", Consolas, ui-monospace, monospace);--mlv-fs-10: 10.5px;--mlv-fs-11: 11px;--mlv-fs-12: 12px;--mlv-fs-13: 13px;--mlv-fs-14: 14px;--mlv-fs-16: 16px;--mlv-fs-20: 20px;--mlv-compact-title: 11.2px;--mlv-lh-tight: 1.35;--mlv-lh-body: 1.5;--mlv-fw-regular: 450;--mlv-fw-medium: 550;--mlv-fw-semi: 650;--mlv-track-caps: .04em;--mlv-s1: 2px;--mlv-s2: 4px;--mlv-s3: 6px;--mlv-s4: 8px;--mlv-s5: 12px;--mlv-s6: 16px;--mlv-s7: 20px;--mlv-s8: 24px;--mlv-s9: 32px;--mlv-s10: 48px;--mlv-r-chip: 4px;--mlv-r-btn: 6px;--mlv-r-node: 10px;--mlv-r-lane: 14px;--mlv-r-panel: 12px;--mlv-r-pill: 999px;--mlv-sh-1: 0 1px 2px rgba(16, 18, 24, .06), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 4px 12px rgba(16, 18, 24, .1), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 16px 40px rgba(16, 18, 24, .18), 0 0 0 1px var(--mlv-border-strong);--mlv-dur-1: .12s;--mlv-dur-2: .18s;--mlv-dur-3: .26s;--mlv-ease: cubic-bezier(.2, .8, .2, 1);--mlv-flow-speed: 220;--mlv-flow-pulse-speed: 320;--mlv-flow-head: 12px;--mlv-flow-gap: 34px;--mlv-flow-gap-call: 96px;--mlv-flow-gap-back: 24px;--mlv-flow-dur-data: .21s;--mlv-flow-dur-call: .49s;--mlv-flow-dur-back: 165ms;--mlv-flow-dur-min: .38s;--mlv-flow-dur-max: 2.2s;--mlv-flow-hop: 90ms;--mlv-flow-width: 3px;--mlv-flow-port-r: 3.5px;--mlv-flow-color: var(--mlv-accent);--mlv-flow-halo-opacity: .18;--mlv-flow-glow-opacity: .42;--mlv-flow-core-width: 1.6;--mlv-flow-underlay-opacity: .28;--mlv-node-w: 216px;--mlv-node-w-lg: 248px;--mlv-node-w-sm: 176px;--mlv-node-h: 72px;--mlv-rail-w: 4px;--mlv-group-header-h: 34px;--mlv-lane-pad: 20px;--mlv-header-h: 36px;--mlv-status-h: 22px;--mlv-rail-width: 360px;--mlv-bg: var(--vscode-editor-background, #FBFBFD);--mlv-surface: var(--vscode-editorWidget-background, #FFFFFF);--mlv-surface-2: 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diff --git a/vscode-extension/media/mlview.js b/vscode-extension/media/mlview.js
index 5f119be4..1bd3eb53 100644
--- a/vscode-extension/media/mlview.js
+++ b/vscode-extension/media/mlview.js
@@ -1,9 +1,9 @@
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i=o;_(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),_(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),_(i,"pointerenter",()=>n.enterEdge(e)),_(i,"pointerleave",()=>n.leaveEdge(e)),_(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),_(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),_(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Cn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new hn;this.mountSerial=ps();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new kn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new xn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new Ln,this.canvasEl.appendChild(this.toasts.root),this.viewport=new yn(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Sl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new _n({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new In({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Sn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new 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this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=kr(this.index,this.collapsedSet),this.routes=Or(this.index,this.frameData,this.collapsedSet),this.labelPlan=hs(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?vn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=Xr({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,l)=>kl(s,r,l,n),wireEdge:(s,r)=>Ll(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,go(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=Yr(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(ml(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(gl(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return 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e=[];for(let n of this.index.graph.nodes||[])this.index.isGroup(n.id)&&e.push(n.id);return this.collapsedSet=new Set(e),this.relayout(),this.viewport.fitWhole(),this.host.afterCollapse(),this.host.announce("Overview: "+e.length+(e.length===1?" group":" groups")+" collapsed, whole diagram fitted."),e.length}expandAncestors(e){if(!this.index)return!1;let n=!1;for(let o of this.index.ancestors(e))this.collapsedSet.delete(o)&&(n=!0);return n&&this.relayout(),n}centerOnNode(e,n){if(!this.index||!this.frameData)return;let o=this.index.visibleRepresentative(e,this.collapsedSet),i=this.frameData.boxes.get(o);if(!i||(this.viewport.centerOn(i),!n))return;let s=this.nodeEls.get(o);s&&(s.classList.add("is-pulse"),setTimeout(()=>s.classList.remove("is-pulse"),700))}revealNode(e,n){if(!this.index||!this.frameData)return;let o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Fe){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else 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n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Hr(this.index,this.frameData,o,n):Uo(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Tl='button, [role="button"], a[href], select';function Rl(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var Tn=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(_(e,"keydown",o=>this.onKey(o))),this.disposers.push(_(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Tl),n=Rl(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function De(t,e=si()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Ol=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Hl=["svg","png","copy-svg"],Jf=0,Rn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Jf;this.button=ne("mlv-btn mlv-btn--icon mlv-btn--more","More actions"),this.button.title="More: legend, flow, fit, export, shortcuts",this.button.appendChild(D("more",16)),this.button.setAttribute("aria-haspopup","menu"),this.button.setAttribute("aria-expanded","false"),this.button.setAttribute("aria-controls",o),_(this.button,"click",s=>{s.preventDefault(),s.stopPropagation(),this.setOpen(!this.openState)}),_(this.button,"keydown",s=>{if(s.key==="Escape"){if(!this.openState)return;s.preventDefault(),s.stopPropagation(),this.setOpen(!1);return}s.key!=="ArrowDown"&&s.key!=="ArrowUp"||(s.preventDefault(),s.stopPropagation(),this.setOpen(!0),this.focusItem(s.key==="ArrowDown"?0:this.shown().length-1))}),this.panel=f("div","mlv-moremenu"),this.panel.id=o,this.panel.setAttribute("role","menu"),this.panel.setAttribute("aria-label","More actions"),this.panel.hidden=!0;for(let s of Ol){if(s.group){let l=g(this.panel,f("div","mlv-moremenu__sep"));l.setAttribute("role","separator"),l.setAttribute("data-sep-before",s.id)}let r=f("button","mlv-moremenu__item");r.type="button",r.tabIndex=-1,r.setAttribute("role",s.check?"menuitemcheckbox":"menuitem"),r.setAttribute("data-more-item",s.id),Hl.indexOf(s.id)>=0&&r.setAttribute("data-export-action",s.id),s.folded&&r.setAttribute("data-folded","1"),r.appendChild(D(s.icon,14)),g(r,f("span","mlv-moremenu__label",s.label)),s.id==="minimap"&&(g(r,f("span","mlv-moremenu__note")).hidden=!0),s.keys&&g(r,f("kbd","mlv-moremenu__keys",De(s.keys))).setAttribute("aria-hidden","true"),_(r,"click",l=>{if(l.preventDefault(),r.disabled)return;let a=l.detail===0;this.setOpen(!1),this.onPick(s.id,a)}),this.panel.appendChild(r),this.items.set(s.id,r)}_(this.panel,"keydown",s=>this.onKey(s));let i=typeof document>"u"?null:document;i&&(this.disposers.push(_(i,"pointerdown",s=>{if(!this.openState)return;let r=s.target;r&&(this.panel.contains(r)||this.button.contains(r))||this.setOpen(!1)})),this.disposers.push(_(i,"keydown",s=>{if(!this.openState||s.key!=="Escape")return;s.preventDefault(),s.stopPropagation();let r=i.activeElement,l=!!r&&(this.panel.contains(r)||this.button.contains(r));this.setOpen(!1),l&&this.focusButton()},!0)))}get open(){return this.openState}update(e){for(let[o,i]of this.items){let s=Ol.find(l=>l.id===o),r=!s.folded||(o==="search"?e.folded.search:o==="about"?e.folded.about:e.folded.exceptions);if(i.hidden=!r,o==="about"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.aboutLabel),i.title="Show About: the request, coverage, limitations and provenance"}if(o==="exceptions"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.exceptionsLabel),i.title=e.exceptionsOn?"The observed claims are faded; choose to show them again":"Fade the observed claims so these stand out"}if(o==="rail"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.railMode==="sheet"?"Bottom panel":"Side panel"),i.title=e.railMode==="sheet"?"Open or collapse the bottom panel":"Show or hide the side panel"}if(s.check){let l=o==="legend"?e.legendOpen:o==="flow"?e.flowOn:o==="minimap"?e.minimapShown&&!e.minimapUnavailable:o==="exceptions"?e.exceptionsOn:e.railOpen;i.setAttribute("aria-checked",l?"true":"false")}if(o==="minimap"){let l=i.querySelector(".mlv-moremenu__note");l&&(l.textContent=e.minimapUnavailable||"",l.hidden=!e.minimapUnavailable),i.disabled=!!e.minimapUnavailable,i.title=e.minimapUnavailable?"Overview map: "+e.minimapUnavailable.charAt(0).toLowerCase()+e.minimapUnavailable.slice(1):"Show or hide the overview map"}o==="zoomsel"&&(i.disabled=!e.hasSelection),Hl.indexOf(o)>=0&&(i.disabled=!e.canExport),i.disabled?i.setAttribute("aria-disabled","true"):i.removeAttribute("aria-disabled")}let n=this.shown()[0];for(let o of Array.from(this.panel.querySelectorAll(".mlv-moremenu__sep")))o.hidden=!!n&&o.getAttribute("data-sep-before")===n.getAttribute("data-more-item")}setOpen(e){if(this.openState!==e)if(this.openState=e,this.panel.hidden=!e,this.button.setAttribute("aria-expanded",e?"true":"false"),e){try{this.beforeOpen()}catch{}this.position(),this.focusItem(0)}else{let n=this.panel.ownerDocument?this.panel.ownerDocument.activeElement:null;n&&this.panel.contains(n)&&this.focusButton()}}shown(){return Array.from(this.items.values()).filter(e=>!e.hidden&&!e.disabled)}position(){let e=null;try{e=this.button.getBoundingClientRect()}catch{e=null}e&&(this.panel.style.position="fixed",this.panel.style.top=Math.round(e.bottom+4)+"px",this.panel.style.left="auto",this.panel.style.right=Math.max(8,Math.round(ep()-e.right))+"px")}focusItem(e){let n=this.shown();if(!n.length)return;let o=(e%n.length+n.length)%n.length;try{n[o].focus()}catch{}}focusButton(){try{this.button.focus()}catch{}}onKey(e){if(e.key==="Escape"){e.preventDefault(),e.stopPropagation(),this.setOpen(!1);return}if(e.key==="Tab"){this.setOpen(!1);return}let n=this.shown(),o=n.indexOf(e.target);if(!(o<0)){if(e.key==="ArrowDown")this.focusItem(o+1);else if(e.key==="ArrowUp")this.focusItem(o-1);else if(e.key==="Home")this.focusItem(0);else if(e.key==="End")this.focusItem(n.length-1);else return;e.preventDefault(),e.stopPropagation()}}destroy(){for(let e of this.disposers)try{e()}catch{}this.disposers=[]}};function ep(){try{if(typeof window<"u"&&window.innerWidth)return window.innerWidth}catch{}return 1280}var ri={mid:620,wide:1e3,full:1200};function tp(t){return t>0?tt+" "+(t===1?e:n);function Nl(t){let e=t.steps+t.connections+t.findings,n=[];return t.steps&&n.push(ke(t.steps,"step","steps")),t.connections&&n.push(ke(t.connections,"connection","connections")),t.findings&&n.push(ke(t.findings,"finding","findings")),e+" not observed ("+n.join(", ")+")"}function np(t){let e=t.coverage.limitations.length;return"Coverage: "+t.coverage.status+(e?" · "+ke(e,"limitation","limitations"):"")}var Pl=4;function op(t){let e=t.steps+t.connections+t.findings;return e+(e===1?" claim":" claims")+" not observed"}var ip=0,On=class{constructor(e,n){this.sevButtons=new Map;this.roving=null;this.layout="full";this.width=0;this.fitLevel=0;this.hasDocument=!1;this.hasExceptions=!1;this.sevShown=new Set;this.searchOpen=!1;this.lastAboutLabel="About this revision";this.state=null;this.cb=e;let o="mlv"+ ++ip;this.header=f("header","mlv-header"),this.header.setAttribute("data-layout",this.layout),this.title=g(this.header,f("h1","mlv-header__title","")),this.toolbar=g(this.header,f("div","mlv-header__bar")),this.toolbar.setAttribute("role","toolbar"),this.toolbar.setAttribute("aria-label","Diagram controls"),this.toolbar.setAttribute("aria-orientation","horizontal"),this.provenance=f("button","mlv-chip mlv-header__prov"),this.provenance.type="button",g(this.provenance,f("span","mlv-header__dot")).setAttribute("aria-hidden","true"),this.provHost=g(this.provenance,f("span","mlv-header__host","")),this.provRev=g(this.provenance,f("span","mlv-header__rev","")),_(this.provenance,"click",a=>e.onAbout(a.detail===0)),this.toolbar.appendChild(this.provenance),g(this.toolbar,f("span","mlv-header__spacer")),this.search=g(this.toolbar,f("div","mlv-search")),g(this.search,D("search",14)).setAttribute("class","mlv-uicon mlv-search__glyph");let s=g(this.search,f("label","mlv-sr","Search steps, findings, IDs, or cited text"));s.htmlFor=o+"-search-input",this.searchInput=g(this.search,f("input","mlv-input")),this.searchInput.id=o+"-search-input",this.searchInput.type="search",this.searchInput.placeholder="Search steps and findings",this.searchInput.setAttribute("role","combobox"),this.searchInput.setAttribute("aria-expanded","false"),this.searchInput.setAttribute("aria-controls",o+"-search-results"),this.searchInput.autocomplete="off",this.results=g(this.search,f("ul","mlv-search__results")),this.results.id=o+"-search-results",this.results.setAttribute("role","listbox"),this.results.setAttribute("aria-label","Search results"),this.results.hidden=!0,_(this.searchInput,"input",()=>e.onQuery(this.searchInput.value)),_(this.searchInput,"keydown",a=>e.onSearchKey(a)),_(this.searchInput,"blur",()=>{this.searchInput.value||this.setSearchOpen(!1)}),this.searchBtn=ne("mlv-btn mlv-btn--icon mlv-header__searchbtn","Search ("+De("Mod+F")+")"),this.searchBtn.appendChild(D("search",16)),this.searchBtn.setAttribute("aria-controls",this.searchInput.id),_(this.searchBtn,"click",()=>e.onSearchOpen()),this.toolbar.appendChild(this.searchBtn);for(let a of Z){let d=f("button","mlv-chip mlv-chip--btn mlv-chip--sev");d.type="button",d.setAttribute("aria-pressed","true"),d.setAttribute("data-severity",a),d.appendChild(U(a,14,"")),g(d,f("span","mlv-chip__count","0")),_(d,"click",()=>e.onSeverity(a)),this.sevButtons.set(a,d),this.toolbar.appendChild(d)}this.sevUnit=g(this.toolbar,f("span","mlv-header__unit","findings")),this.sevUnit.setAttribute("aria-hidden","true"),this.sevUnit.hidden=!0,this.exceptionsBtn=f("button","mlv-chip mlv-chip--btn mlv-chip--exceptions"),this.exceptionsBtn.type="button",this.exceptionsBtn.setAttribute("aria-pressed","false"),this.exceptionsBtn.hidden=!0,_(this.exceptionsBtn,"click",()=>e.onToggleExceptions(this.exceptionsBtn.getAttribute("aria-pressed")!=="true")),this.toolbar.appendChild(this.exceptionsBtn),this.more=new Rn((a,d)=>this.pick(a,d),()=>e.onMenuOpen()),this.toolbar.appendChild(this.more.button),this.refineSlot=g(this.toolbar,f("span","mlv-header__refine")),this.status=f("footer","mlv-status"),this.status.setAttribute("data-layout",this.layout),this.counts=g(this.status,f("span","mlv-status__counts","")),this.coverage=f("button","mlv-status__coverage"),this.coverage.type="button",this.coverage.hidden=!0,_(this.coverage,"click",a=>e.onAbout(a.detail===0)),this.status.appendChild(this.coverage),g(this.status,f("span","mlv-status__spacer")),this.fresh=g(this.status,f("span","mlv-status__freshness"));let r=ne("mlv-btn mlv-btn--icon mlv-zoom__btn","Zoom out");r.appendChild(D("minus",12)),_(r,"click",()=>e.onZoom(-1));let l=ne("mlv-btn mlv-btn--icon mlv-zoom__btn","Zoom in");l.appendChild(D("plus",12)),_(l,"click",()=>e.onZoom(1)),n.insertBefore(r,n.firstChild),n.appendChild(l),this.status.appendChild(n),this.roving=new Tn(this.toolbar)}destroy(){this.roving&&this.roving.destroy(),this.roving=null,this.more.destroy()}syncRoving(){this.fitRow()}setWidth(e){let n=tp(e),o=n!==this.layout;return o&&(this.layout=n,this.header.setAttribute("data-layout",n),this.status.setAttribute("data-layout",n),this.syncSearch()),(o||e!==this.width)&&(this.width=e,this.fitRow()),n}get headerFit(){return this.fitLevel}get headerLayout(){return this.layout}setSearchOpen(e){this.searchOpen=e,this.syncSearch(),this.fitRow()}syncSearch(){let n=!(this.layout==="mid"||this.layout==="narrow")||this.searchOpen||!!this.searchInput.value;this.header.setAttribute("data-search",n?"open":"closed"),this.searchBtn.setAttribute("aria-expanded",n?"true":"false"),this.syncControls()}syncControls(){this.provenance.hidden=!this.hasDocument||this.layout==="narrow"||this.fitLevel>=1;let e=(this.layout==="mid"||this.layout==="narrow")&&this.header.getAttribute("data-search")!=="open";this.searchBtn.hidden=!(this.layout==="mid"&&e),this.exceptionsBtn.hidden=!this.hasExceptions||this.fitLevel>=2;for(let[n,o]of this.sevButtons)o.hidden=!this.sevShown.has(n)||this.fitLevel>=4;this.sevUnit.hidden=this.sevShown.size===0||this.fitLevel>=4,this.header.setAttribute("data-fit",String(this.fitLevel))}fitRow(){this.fitLevel=0,this.syncControls();let e=this.header.clientWidth,n=this.header.getAttribute("data-search")==="open"&&(this.layout==="mid"||this.layout==="narrow")?Pl:Pl-1;if(e>0)for(;this.fitLevelthis.header.clientWidth;)this.fitLevel++,this.syncControls();this.updateMenu(),this.roving&&this.roving.sync()}updateMenu(){let e=this.state;if(!e)return;let n=e.notObserved,o=this.hasExceptions&&this.fitLevel>=2;this.more.update({folded:{search:this.layout==="narrow",about:this.layout==="narrow"||this.fitLevel>=1,exceptions:o},aboutLabel:this.lastAboutLabel,exceptionsLabel:this.hasExceptions?Nl(n):"",exceptionsOn:e.exceptionsOn,legendOpen:e.legendOpen,flowOn:e.flowOn,minimapShown:!e.minimapCollapsed,minimapUnavailable:e.minimapUnavailable,railOpen:e.railOpen,railMode:e.railMode,hasSelection:e.hasSelection,canExport:!!e.graph})}pick(e,n){let 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L=tc(c.points,c.mid,y.rect);L.moved&&o.nudged++,o.placed++,y.flipped&&o.flipped++,y.shift>0&&o.shifted++,w&&o.fallback++,r.add(y.rect),n.set(c.id,{id:c.id,text:u,x:y.x,y:y.y,rect:y.rect,hidden:!1,flipped:y.flipped,axis:S?S.axis:"h",laneId:x?x.id:null,fallback:w,shifted:y.shift,marker:L.point,always:d})}}return{placements:n,stats:o}}function xo(t,e,n){return tn?n:t}function Se(t){return Math.round(t*100)/100}var nc=["data","call","control","config","state","loop","output"],oc={data:"data",dataflow:"data","data flow":"data",flow:"data",control:"control","control flow":"control",branch:"control","conditional call":"control",decision:"control",state:"state","state update":"state",update:"state","state read":"state","state copy":"state",gradient:"state","gradient flow":"state",optimizes:"state",ownership:"state","state ownership":"state",config:"config",configuration:"config","configuration 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i=o;k(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),k(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),k(i,"pointerenter",()=>n.enterEdge(e)),k(i,"pointerleave",()=>n.leaveEdge(e)),k(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),k(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),k(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Pn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new bn;this.mountSerial=Ls();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new Rn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new Mn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new On,this.canvasEl.appendChild(this.toasts.root),this.viewport=new _n(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Fl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new An({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new Nn({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Cn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new 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Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,So(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=al(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(Il(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(Al(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,l=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+l+(l===1?" step":" steps")+" hidden.":" expanded."))}overview(){if(!this.index)return 0;let 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o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Le){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else r&&(l=this.edgeEls.get(r)?.querySelector(".mlv-edge__hit"));if(l)try{l.focus()}catch{}}frameIssue(e){if(!this.index||!this.frameData)return;let n=this.index.issueById.get(e);if(!n)return;let o=[],i=[];for(let d of n.nodeIds){let c=this.targetRect({kind:"node",id:d});c&&o.push(c)}for(let d of n.edgeIds){let c=this.targetRect({kind:"edge",id:d});c&&i.push(c)}let s=o.concat(i);if(!s.length)return;let r=d=>{let c=Math.min(...d.map(h=>h.x)),u=Math.min(...d.map(h=>h.y));return{x:c,y:u,w:Math.max(...d.map(h=>h.x+h.w))-c,h:Math.max(...d.map(h=>h.y+h.h))-u}},l=r(s),a=!o.length||!i.length||this.viewport.fitsAt(l,Sn)?l:r(o);this.viewport.frameRect(a,s[0],At),n.nodeIds[0]&&this.pulseNode(this.index.visibleRepresentative(n.nodeIds[0],this.collapsedSet))}revealEdge(e){let n=this.targetRect({kind:"edge",id:e});n&&(this.viewport.vp.zoomn.classList.remove("is-pulse"),700))}zoomStep(e){let n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Ur(this.index,this.frameData,o,n):ti(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Vl='button, [role="button"], a[href], select';function ql(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var rt=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(k(e,"keydown",o=>this.onKey(o))),this.disposers.push(k(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Vl),n=ql(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function Ge(t,e=fi()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Kl=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"review",label:"Review the claims",icon:"review",keys:"R",group:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Ul=["svg","png","copy-svg"],Ep=0,Fn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Ep;this.button=ne("mlv-btn mlv-btn--icon mlv-btn--more","More actions"),this.button.title="More: legend, flow, fit, export, shortcuts",this.button.appendChild(H("more",16)),this.button.setAttribute("aria-haspopup","menu"),this.button.setAttribute("aria-expanded","false"),this.button.setAttribute("aria-controls",o),k(this.button,"click",s=>{s.preventDefault(),s.stopPropagation(),this.setOpen(!this.openState)}),k(this.button,"keydown",s=>{if(s.key==="Escape"){if(!this.openState)return;s.preventDefault(),s.stopPropagation(),this.setOpen(!1);return}s.key!=="ArrowDown"&&s.key!=="ArrowUp"||(s.preventDefault(),s.stopPropagation(),this.setOpen(!0),this.focusItem(s.key==="ArrowDown"?0:this.shown().length-1))}),this.panel=f("div","mlv-moremenu"),this.panel.id=o,this.panel.setAttribute("role","menu"),this.panel.setAttribute("aria-label","More actions"),this.panel.hidden=!0;for(let s of Kl){if(s.group){let l=g(this.panel,f("div","mlv-moremenu__sep"));l.setAttribute("role","separator"),l.setAttribute("data-sep-before",s.id)}let r=f("button","mlv-moremenu__item");r.type="button",r.tabIndex=-1,r.setAttribute("role",s.check?"menuitemcheckbox":"menuitem"),r.setAttribute("data-more-item",s.id),Ul.indexOf(s.id)>=0&&r.setAttribute("data-export-action",s.id),s.folded&&r.setAttribute("data-folded","1"),r.appendChild(H(s.icon,14)),g(r,f("span","mlv-moremenu__label",s.label)),s.id==="minimap"&&(g(r,f("span","mlv-moremenu__note")).hidden=!0),s.keys&&g(r,f("kbd","mlv-moremenu__keys",Ge(s.keys))).setAttribute("aria-hidden","true"),k(r,"click",l=>{if(l.preventDefault(),r.disabled)return;let a=l.detail===0;this.setOpen(!1),this.onPick(s.id,a)}),this.panel.appendChild(r),this.items.set(s.id,r)}k(this.panel,"keydown",s=>this.onKey(s));let i=typeof document>"u"?null:document;i&&(this.disposers.push(k(i,"pointerdown",s=>{if(!this.openState)return;let r=s.target;r&&(this.panel.contains(r)||this.button.contains(r))||this.setOpen(!1)})),this.disposers.push(k(i,"keydown",s=>{if(!this.openState||s.key!=="Escape")return;s.preventDefault(),s.stopPropagation();let r=i.activeElement,l=!!r&&(this.panel.contains(r)||this.button.contains(r));this.setOpen(!1),l&&this.focusButton()},!0)))}get open(){return this.openState}update(e){for(let[o,i]of this.items){let s=Kl.find(l=>l.id===o),r=!s.folded||(o==="search"?e.folded.search:o==="about"?e.folded.about:e.folded.exceptions);if(i.hidden=!r,o==="about"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.aboutLabel),i.title="Show About: the request, coverage, limitations and provenance"}if(o==="exceptions"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.exceptionsLabel),i.title=e.exceptionsOn?"The observed claims are faded; choose to show them again":"Fade the observed claims so these stand out"}if(o==="review"){let 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Focus stays here; Alt+Enter moves it to the editor."))}var Ag=["about","issues","inspector","outline"];function eo(t){if(!t||typeof t!="object")return null;let{kind:e,id:n}=t;return e!=="node"&&e!=="edge"&&e!=="issue"||typeof n!="string"||!n?null:{kind:e,id:n}}function to(t){return typeof t=="string"&&Ag.indexOf(t)>=0?t:null}function ud(t){return{focusSearch:()=>t.focusSearch(),escape:()=>t.dismissTopmost(),cycleIssue:e=>{if(t.walking())return t.walkFindings(e);let n=t.visibleIssues();if(!n.length)return!1;let o=t.selectedIssueId(),s=((o?n.findIndex(r=>r.id===o):-1)+(e?-1:1)+n.length)%n.length;return t.focusIssue(n[s].id),!0},zoom:e=>t.zoom(e),fit:()=>t.fit(),toggleFocusMode:()=>t.toggleFocusMode(),zoomToSelection:()=>t.zoomToSelection(),overview:()=>t.overview(),toggleLegend:()=>t.toggleLegend(),toggleFlow:()=>t.toggleFlow(),replayFlow:()=>t.replayFlow(),toggleCollapse:()=>t.collapseSelection(),openSelection:e=>t.openSelection(e),move:e=>t.move(e),toggleSeverity:e=>{let n=Z[e];n&&t.toggleSeverity(n)},toggleRail:()=>t.toggleRail(),focusRailTabs:()=>t.focusRailTabs(),toggleShortcuts:()=>t.toggleShortcuts(),cycleConnections:e=>t.cycleConnections(e),walking:()=>t.walking(),review:()=>t.review(),walkStep:e=>t.walkStep(e),walkQuote:e=>t.walkQuote(e),walkNotObserved:e=>t.walkNotObserved(e)}}function hd(t){return{focusSearch:()=>t.focusSearch(),dismissTopmost:()=>{if(t.sheetOpen())t.toggleShortcuts(!1);else{if(t.closeHeaderPanels())return!0;if(t.legendOpen())t.closeLegend();else{if(t.endWalk())return!0;if(t.collapseSheet())return!0;if(t.view().isFocusLocked)t.view().toggleFocusMode(t.selection());else if(t.selection())t.view().blurFocusedEdge(),t.clearSelection();else{let e=t.view().canvasEl,n=e.ownerDocument?e.ownerDocument.activeElement:null;if(!n||!e.contains(n))return!1;e.blur()}}}return!0},visibleIssues:()=>t.visibleIssues(),selectedIssueId:()=>{let e=t.selection();return e&&e.kind==="issue"?e.id:null},focusIssue:e=>t.focusIssue(e),zoom:e=>t.view().zoomStep(e),fit:()=>t.view().fit(),toggleFocusMode:()=>t.view().toggleFocusMode(t.selection()),zoomToSelection:()=>t.zoomToSelection(),overview:()=>t.view().overview(),toggleLegend:()=>t.toggleLegend(),toggleFlow:()=>t.toggleFlow(),replayFlow:()=>t.view().flow.replay()?(t.announce("Playing the connection flow again."),!0):!1,collapseSelection:()=>{let e=t.selection(),n=t.index();if(!e||e.kind!=="node"||!n)return!1;let o=n.isGroup(e.id)?e.id:n.parentOf.get(e.id)||null;return!o||!n.isGroup(o)?!1:(t.view().toggleCollapse(o),!0)},openSelection:e=>t.openSelection(e),move:e=>t.move(e),toggleSeverity:e=>t.toggleSeverity(e),toggleRail:()=>t.toggleRail(),focusRailTabs:()=>t.focusRailTabs(),toggleShortcuts:()=>t.toggleShortcuts(),cycleConnections:e=>Cg(t,e),walking:()=>t.walking(),review:()=>t.review(),walkStep:e=>t.walkStep(e),walkQuote:e=>t.walkQuote(e),walkNotObserved:e=>t.walkJump("notObserved",e),walkFindings:e=>t.walkJump("findings",e)}}function Cg(t,e){let n=t.selection(),o=null;if(n&&n.kind==="node"?o=n.id:n&&n.kind==="edge"&&(o=t.edgeAnchor()),!o)return!1;let i=t.view().incidentRoutes(o);if(!i.length)return t.view().toast("That node has no connections in this view."),!0;let s=n&&n.kind==="edge"?n.id:null,r=-1;for(let a=0;at.view,index:()=>t.index,selection:()=>t.selection,edgeAnchor:()=>t.edgeAnchor,setEdgeAnchor:e=>{t.edgeAnchor=e},select:e=>t.select(e),clearSelection:()=>t.clearSelection(),focusSearch:()=>t.focusSearch(),visibleIssues:()=>Rg(t),focusIssue:e=>t.focusIssue(e,{fromList:"issues"}),openSelection:e=>{let n=t.selection;if(!n)return!1;if(t.walk.active&&t.walkOwns(n))return t.walk.reopen(e);let o=t.locOf(n);return o&&t.openLocation(o,e),!0},zoomToSelection:()=>t.zoomToSelection(),move:e=>Og(t,e),toggleSeverity:e=>t.applyFilters(()=>t.filters.toggleSeverity(e)),toggleRail:()=>t.toggleRail(),focusRailTabs:()=>t.focusRailTabs(),toggleShortcuts:e=>t.toggleShortcuts(e),sheetOpen:()=>t.sheet.open,closeHeaderPanels:()=>t.closeHeaderPanels(),collapseSheet:()=>t.collapseSheet(!1),announce:e=>t.announce(e),toggleLegend:()=>t.setLegend(!t.legendOpen),legendOpen:()=>t.legendOpen,closeLegend:()=>t.setLegend(!1),toggleFlow:()=>t.setFlow(!t.flowOn),walking:()=>t.walk.active,endWalk:()=>t.walk.stop(),review:()=>t.walk.toggle(),walkStep:e=>t.walk.step(e),walkQuote:e=>t.walk.stepQuote(e),walkJump:(e,n)=>t.walk.jump(e,n)})}function Rg(t){return t.graph?t.graph.issues.filter(t.filters.keep):[]}function Og(t,e){let n=t.selection,o=t.view.nextSelection(n&&n.kind==="node"?n.id:null,e);if(!o)return;t.select({kind:"node",id:o.id},{center:!o.visible});let i=t.view.nodeElement(o.id);i&&i.focus()}function no(t,e,n){if(!e||typeof e!="object")return;e.filters&&t.filters.restore(e.filters);let o=to(e.railTab);if(o&&(t.railTab=o),Array.isArray(e.collapsed)){t.collapsedState=e.collapsed.slice();let s=t.index;s&&t.view.setCollapsed(e.collapsed.filter(r=>s.isGroup(r)))}let i=eo(e.selection);n&&i&&(t.selection=i),typeof e.minimapCollapsed=="boolean"&&t.view.setMinimapCollapsed(e.minimapCollapsed),typeof e.flow=="boolean"&&t.setFlow(e.flow),typeof e.legendOpen=="boolean"&&t.setLegend(e.legendOpen),n&&t.index&&(t.view.relayout(),K(t),U(t),t.view.applySelection(t.selection)),e.viewport&&t.view.viewport.set(e.viewport)}function pd(t){Jn(t);let e={viewport:{...t.viewportState},selection:t.selection?{...t.selection}:null,collapsed:t.collapsedState.slice(),filters:t.filters.snapshot(),railTab:t.railTab,minimapCollapsed:t.view.minimapCollapsed};if(t.flowOn||(e.flow=!1),t.legendOpen&&(e.legendOpen=!0),t.graph&&t.workflowRevision){e.workflowRevision=t.workflowRevision;let n=Os(t.root);n&&(e.composer=n),t.railMode==="sheet"&&t.railOpen&&(e.sheetOpen=!0);let o=t.walk.viewState();o&&(e.walk=o)}return e}function md(t){try{return t.loadState()}catch{return null}}function gd(t,e){ls(e,{init:(n,o)=>{t.caps=o||t.caps,t.setTheme(n),K(t),U(t)},workflow:n=>{n!==t.workflowDocument&&t.setWorkflow(n)},workflowStatus:n=>Fs(t,n),hostNotice:(n,o)=>t.showHostNotice(n,o),stale:n=>t.setStale(n),actionResult:n=>t.onActionResult(n),theme:n=>t.setTheme(n),revealNode:(n,o)=>t.focusNode(n,{center:o,pulse:!0}),revealIssue:n=>t.focusIssue(n),restoreState:n=>no(t,n,!0),onUnknown:n=>t.bridge.post({v:1,type:"log",level:"debug",message:"ignored unknown message type: "+n})})}var Hg=150,Ng=100;function Pg(t){if(!t||typeof t!="object")return null;let e=t,n=typeof e.filter=="string"&&at.indexOf(e.filter)>=0?e.filter:null,o=e.claim;if(!n||!o||typeof o!="object"||o.kind!=="node"&&o.kind!=="edge"&&o.kind!=="issue"||typeof o.id!="string"||!o.id)return null;let i={filter:n,claim:{kind:o.kind,id:o.id}},s=e.quote;return typeof s=="number"&&Number.isInteger(s)&&s>0&&s!!this.app.freshness.reasonOf(e);this.app=e}index(){return this.app.index}claims(){let e=this.index();return e?(e!==this.orderIndex&&(this.order=ta(e),this.orderIndex=e),this.order):[]}changedOffered(){return na(this.app.freshness.list().map(e=>e.reason))}counts(){let e=this.index();return e?sa(this.claims(),e,this.isStale):{notObserved:0,findings:0,changed:0,all:0}}offered(){return ra(this.counts(),this.changedOffered())}listFor(e){let n=this.index();return n?ia(this.claims(),e,n,this.isStale):[]}current(){return this.position>=0&&this.position=0?i.filter:o.indexOf("notObserved")>=0?"notObserved":"all";let r=this.listFor(s);if(!r.length)return this.app.announce("This revision has no claims to walk."),!1;let l=this.active;l||this.app.openRailForWalk(),this.filter=s,this.list=r;let a=i?i.claim:null;return this.position=Math.max(0,ct(r,a,this.claims())),this.quote=i&&le(i.claim,this.current())?Math.min(i.quote||0,Math.max(0,this.currentLocs().length-1)):0,this.active=!0,l||this.app.onWalkShown(!0),this.show(!0),!0}stop(e=!0){return this.active?(this.active=!1,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"end"}),this.remember(),this.app.onWalkShown(!1),e&&this.app.announce("Review ended. r resumes it here."),this.app.saveSoon(),!0):!1}toggle(){this.active?this.stop():this.start()}step(e){if(!this.active||!this.list.length)return!1;let n=Math.max(0,Math.min(this.list.length-1,this.position+e));return n===this.position?(this.app.announce(e>0?"Claim "+this.list.length+" of "+this.list.length+" is the last one.":"Claim 1 of "+this.list.length+" is the first one."),!0):(this.position=n,this.quote=0,this.show(!0),!0)}stepQuote(e){if(!this.active)return!1;let n=this.currentLocs();if(n.length<2)return this.app.announce(n.length?"This claim has one quote.":"This claim cites no 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":" claims. ")+this.announcement())}reopen(e){return!this.active||!this.current()?!1:(this.cancelTimer(),this.sendOpen(e),!0)}openQuote(e,n){if(!this.active||!e.evidenceId)return!1;let o=this.currentLocs().findIndex(i=>i.evidenceId===e.evidenceId);return o<0?!1:(this.quote=o,this.cancelTimer(),this.sendOpen(n),this.remember(),!0)}followSelection(e){if(!this.active||this.selecting||!e)return;let n=this.list.findIndex(o=>le(o,e));n<0||n===this.position||(this.position=n,this.quote=0,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("idle"),this.remember(),this.render())}onDocument(e){let n=this.app.workflowRevision;e&&(this.active&&this.stop(!1),this.remembered=null,this.list=[],this.position=-1);let o=this.restored;if(this.restored=null,o&&o.revision===n&&!this.remembered){this.remembered={revision:n,state:o.state},o.state.active&&this.resume();return}if(!this.active)return;let i=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,ct(this.list,i,this.claims())),this.render()}resume(){let e=this.remembered?this.remembered.state:null;if(!e)return;let n=this.offered();this.filter=n.indexOf(e.filter)>=0?e.filter:"all",this.list=this.listFor(this.filter),this.list.length&&(this.position=Math.max(0,ct(this.list,e.claim,this.claims())),this.quote=le(e.claim,this.current())?Math.min(e.quote||0,Math.max(0,this.currentLocs().length-1)):0,this.active=!0,this.app.onWalkShown(!0),this.show(!1))}onStale(){if(!this.active)return;this.offered().indexOf(this.filter)<0&&(this.filter="all");let e=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,ct(this.list,e,this.claims())),this.render()}onResult(e,n){if(!(!this.active||n!==this.latestSeq||e.outcome==="cancelled")){if(e.outcome==="done")this.status=this.statusFor("done");else{let o=e.message||(e.outcome==="blocked"?"Not opened.":"VS Code could not show the file.");this.status=this.statusFor(e.outcome,o),this.app.announce((e.outcome==="blocked"?"Not opened: ":"Failed: ")+o)}this.render()}}cancelTimer(){this.timer!==null&&clearTimeout(this.timer),this.timer=null}statusFor(e,n){let o=this.currentLocs(),i=Math.min(this.quote,Math.max(0,o.length-1)),s={state:e,quote:i,quotes:o.length};return o[i]&&e!=="none"&&e!=="unavailable"&&(s.loc=o[i]),n&&(s.message=n),s}localBlock(e){let n=e.evidenceId?this.app.freshness.reasonOf(e.file):void 0;return n?e.file+": "+ae[n]+"; not opened.":null}scheduleOpen(){this.cancelTimer();let e=this.currentLocs(),n=e[Math.min(this.quote,e.length-1)];if(!e.length||!n)this.status=this.statusFor("none");else if(!this.app.caps.canOpenSource)this.status=this.statusFor("unavailable");else{let o=this.localBlock(n);this.status=o?this.statusFor("blocked",o):this.statusFor("opening")}this.status.state!=="unavailable"&&(this.timer=setTimeout(()=>{this.timer=null,this.sendOpen(!1)},Hg))}get pendingOpen(){return this.timer!==null}flushOpen(){this.timer!==null&&(this.cancelTimer(),this.sendOpen(!1))}sendOpen(e){if(!this.active)return;let n=this.currentLocs(),o=n[Math.min(this.quote,n.length-1)];if(!o){this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("none"),this.render();return}if(!this.app.caps.canOpenSource){this.status=this.statusFor("unavailable"),this.render();return}let i=++this.seq;this.latestSeq=i,this.remember(),this.app.bridge.saveState(this.app.getState());let s=Yi(o);s.walk=!0,s.seq=i,e&&(s.focus=!0),this.app.postRequest(s,l=>this.onResult(l,i));let r=this.localBlock(o);this.status=r?this.statusFor("blocked",r):this.statusFor("opening"),this.render()}show(e){let n=this.current();if(n){this.selecting=!0;try{this.app.showWalkClaim(n)}finally{this.selecting=!1}e?this.scheduleOpen():this.status=this.statusFor(this.currentLocs().length?this.app.caps.canOpenSource?"idle":"unavailable":"none"),this.remember(),this.render(),this.app.announce(this.announcement()),this.app.saveSoon()}}announcement(){let e=this.index(),n=this.current();return e&&n?aa(this.position,this.list.length,this.filter,e,n):""}render(e=!1){this.app.renderWalkBar(),Ei(this.app.rail.root,this.paneMark(),e)}paneMark(){if(!this.active)return null;let e=this.current();return!e||!le(e,this.app.selection)?null:{quote:this.status.quote,status:this.status}}remember(){let e=this.app.workflowRevision,n=this.current();if(!e||!n)return;let o={filter:this.filter,claim:{kind:n.kind,id:n.id}};this.quote>0&&(o.quote=this.quote),this.active&&(o.active=!0),this.remembered={revision:e,state:o}}viewState(){let e=this.app.workflowRevision;if(!this.remembered||!e||this.remembered.revision!==e)return;let n={...this.remembered.state,claim:{...this.remembered.state.claim}};return this.active?n.active=!0:delete n.active,n}restore(e,n){let o=Pg(n);this.restored=o?{revision:e,state:o}:null}destroy(){this.cancelTimer()}};var Fg=32,Zi=900,Bg=620,Dg=.47,vd=.25,bd=.75,io=class{constructor(e,n){this.graph=null;this.index=null;this.edgeAnchor=null;this.flowOn=!0;this.exceptionsOn=!1;this.filters=new Wt;this.viewportState={x:0,y:0,zoom:1};this.selection=null;this.collapsedState=[];this.railTab="about";this.legendOpen=!1;this.freshness=new Gt;this.openHintShown=!1;this.railOpen=!0;this.railChosen=!1;this.dockedHidden=!1;this.railWidth=360;this.railMode="docked";this.sheetFraction=Dg;this.paneColumns=1;this.workflowDocument=null;this.workflowRevision=null;this.restoredView=null;this.restoredComposer=null;this.restoredTab=null;this.restoredSelection=null;this.restoredSheet=null;this.pending=new Map;this.requestSerial=0;this.disposers=[];this.destroyed=!1;this.releasePage=()=>{};this.saveSoon=$i(()=>this.bridge.saveState(this.getState()),250);this.root=e,this.bridge=n,this.caps=n.capabilities,this.themes=new zt(e,n.theme||"light"),this.doubleClick=new on(e),this.disposers.push(()=>this.doubleClick.dispose()),this.walk=new oo(this),dd(this);let o=md(n);o&&no(this,o,!1),o&&typeof o.workflowRevision=="string"&&o.viewport&&(this.restoredView={revision:o.workflowRevision,viewport:{...o.viewport}});let i=o&&typeof o.workflowRevision=="string"?Ns(o.composer):null;o&&i&&(this.restoredComposer={revision:o.workflowRevision,composer:i});let s=o&&typeof o.workflowRevision=="string"?to(o.railTab):null;o&&s&&(this.restoredTab={revision:o.workflowRevision,tab:s});let r=o&&typeof o.workflowRevision=="string"?eo(o.selection):null;o&&r&&(this.restoredSelection={revision:o.workflowRevision,selection:r}),o&&typeof o.workflowRevision=="string"&&o.sheetOpen===!0&&(this.restoredSheet=o.workflowRevision),o&&typeof o.workflowRevision=="string"&&this.walk.restore(o.workflowRevision,o.walk),this.disposers.push(n.onMessage(l=>this.onMessage(l))),typeof window<"u"&&this.disposers.push(k(window,"resize",()=>this.onResize())),this.disposers.push(k(e,"keydown",l=>{l.defaultPrevented||!(l.ctrlKey||l.metaKey)||l.altKey||l.key!=="f"&&l.key!=="F"||this.modalOpen(l.target)||(l.preventDefault(),this.focusSearch())})),this.disposers.push(k(e,"keydown",l=>{l.key!=="Escape"||l.defaultPrevented||!this.walk.active||this.modalOpen(l.target)||this.walk.stop()&&l.preventDefault()})),this.chrome.setWidth(this.rootWidth()),this.view.setPanelWidth(this.rootWidth())}rootWidth(){let e=this.root.getBoundingClientRect().width;return e>0?e:0}onResize(){let e=this.chrome.headerLayout;this.chrome.setWidth(this.rootWidth())!==e&&(K(this),this.renderWalkBar()),this.view.setPanelWidth(this.rootWidth()),this.autoRail(),this.paneColumns!==this.selectionColumns()&&U(this)}selectionColumns(){return this.railMode==="sheet"&&this.rootWidth()>=Bg?2:1}railShown(){return this.railOpen}refreshChrome(){K(this)}focusSearch(){this.chrome.setSearchOpen(!0),this.search.focus()}showAbout(e={}){this.railTab="about",this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon();let n=e.at==="limitations"?this.rail.revealLimitations():e.focus?this.rail.activePanel():null;if(e.focus&&n)try{n.focus()}catch{}this.announce(e.at==="limitations"?"About: the coverage limitations.":"About this revision shown.")}modalOpen(e){if(this.sheet&&this.sheet.open||Mo(this))return!0;let n=e;return!!n&&typeof n.closest=="function"&&!!n.closest(".mlv-sheet, .mlv-workflow__composer")}closeHeaderPanels(){return Lo(this,!0)}headerPanelOpen(){return Mo(this)}setWorkflow(e,n){let o=this.workflowRevision!==e.revision.id,i=n;if(!n||!n.viewport){let r=null;this.graph&&this.workflowRevision===e.revision.id?r={...this.viewportState}:!this.graph&&this.restoredView&&this.restoredView.revision===e.revision.id&&(r={...this.restoredView.viewport}),r&&(i={...n||{},viewport:r})}this.restoredView=null;let s=this.restoredComposer&&this.restoredComposer.revision===e.revision.id?this.restoredComposer.composer:null;if(this.restoredComposer=null,this.workflowRevision!==e.revision.id){let r=!this.graph&&this.restoredTab&&this.restoredTab.revision===e.revision.id?this.restoredTab.tab:null;this.railTab=r||"about"}if(this.restoredTab=null,!this.graph){let r=l=>l===e.revision.id;this.restoredSelection&&r(this.restoredSelection.revision)&&(this.selection=this.restoredSelection.selection),r(this.restoredSheet)&&(this.railChosen=!0,this.railOpen=!0)}this.restoredSelection=null,this.restoredSheet=null,this.workflowDocument=e,this.workflowRevision=e.revision.id,this.autoRail(),ld(this,nn(e),i,!0),Bs(this,e,s),this.legendOtherKinds(),this.view.afterChromeChange(),this.walk.onDocument(o),this.syncNoticeReview()}postRequest(e,n){this.requestSerial+=1;let o="";for(let s=0;s<4;s++)o+=Math.floor(Math.random()*36).toString(36);let i="r"+this.requestSerial.toString(36)+"-"+o;for(this.pending.set(i,n);this.pending.size>Fg;){let s=this.pending.keys().next().value;if(s===void 0)break;this.pending.delete(s)}return this.bridge.post({...e,requestId:i}),i}onActionResult(e){if(!e||typeof e.requestId!="string")return;let n=this.pending.get(e.requestId);n&&(this.pending.delete(e.requestId),n(e))}openLocation(e,n=!1){cd(this,e,n)}setStale(e){this.freshness.set(e)&&(this.view.setStale(this.freshness.list()),this.index&&this.view.refresh(this.selection),K(this),U(this),this.walk.onStale(),this.syncNoticeReview())}showHostNotice(e,n){let o=!!n&&n.length===1&&n[0]==="checking";if(this.freshness.checking!==o&&(this.freshness.checking=o,K(this)),o)return;let i=this.notice.root.hidden;this.notice.update(e,n),this.syncNoticeReview();let s=this.root.querySelector(".mlv-body");s&&this.notice.root.nextSibling!==s&&this.root.insertBefore(this.notice.root,s),this.graph&&i!==this.notice.root.hidden&&this.view.afterChromeChange()}syncNoticeReview(){let e=this.graph&&this.walk.changedOffered()?this.walk.counts().changed:0;this.notice.setReview(e,this.walk.active)}renderWalkBar(){if(!this.walkBar)return;let e=this.walk;if(!e.active){this.walkBar.update(null);return}this.walkBar.update({position:e.position,total:e.list.length,filter:e.filter,counts:e.counts(),offered:e.offered(),status:e.status,narrow:this.chrome.headerLayout==="narrow"})}onWalkShown(e){this.renderWalkBar(),K(this),this.syncNoticeReview(),e||U(this),this.graph&&this.view.afterSheetToggle()}openRailForWalk(){this.railMode!=="docked"||this.railOpen||(this.railChosen=!0,this.setRailOpen(!0))}walkOwns(e){return le(this.walk.current(),e)}showWalkClaim(e){let n=this.index;if(!n)return;let o=r=>{let l=n.edgeById.get(r);l&&(this.view.expandAncestors(l.source),this.view.expandAncestors(l.target))};if(e.kind==="issue"){let r=n.issueById.get(e.id);if(!r)return;for(let l of r.nodeIds)this.view.expandAncestors(l);for(let l of r.edgeIds)o(l)}else e.kind==="node"?this.view.expandAncestors(e.id):o(e.id);this.select(e,{tab:"inspector",showClaim:!0}),e.kind==="issue"?this.view.frameIssue(e.id):this.view.revealTarget({kind:e.kind,id:e.id});let i=this.view.canvasEl,s=i.ownerDocument?i.ownerDocument.activeElement:null;if(s&&s!==i&&i.contains(s))try{i.focus()}catch{}}setMinimapCollapsed(e){this.view.setMinimapCollapsed(e),K(this),this.saveSoon(),this.announce("Overview minimap "+(e?"hidden":"shown")+".")}setLegend(e){this.legendOpen=e,this.legend.setOpen(e),K(this),this.saveSoon()}setRailTab(e){this.railTab=e,this.railMode==="sheet"&&!this.railOpen&&(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon()}showRailTab(e){this.railTab=e,this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon(),this.railMode==="sheet"&&this.rail.focusTab(e)}focusRailTabs(){this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.rail.focusTab(this.railTab)}toggleRail(){this.railChosen=!0,this.railMode==="docked"&&(this.dockedHidden=this.railOpen),this.setRailOpen(!this.railOpen)}collapseSheet(e=!1){if(this.railMode!=="sheet"||!this.railOpen)return!1;if(this.railChosen=!0,this.setRailOpen(!1),this.announce("Bottom panel collapsed."),e)try{this.view.canvasEl.focus()}catch{}return!0}sheetFractionMax(){let e=this.root.querySelector(".mlv-body"),n=e?e.getBoundingClientRect().height:0;if(!(n>0))return bd;let o=Math.min(240,.45*n);return Math.max(vd,Math.min(bd,(n-o)/n))}setSheetFraction(e){let n=Math.max(vd,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Zi?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),U(this),K(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&K(this),e&&this.rail&&U(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Zi>=280?n-Zi:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),K(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),K(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),U(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),this.walk.followSelection(e),n&&n.open)if(this.walk.active&&this.walkOwns(e))this.walk.reopen(!!n.focusEditor);else{let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),U(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(_l()){let n=pa(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),K(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),U(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){fd(this,e)}onMessage(e){gd(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;if(this.walk.active&&this.walkOwns(this.selection)){this.walk.reopen(n);return}let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return pd(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.walk.destroy(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.walkBar.destroy(),this.view.destroy(),this.releasePage(),N(this.root),this.root.classList.remove("mlv-root")}}};var Ft=null;function jg(){if(Ft)return Ft;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Ft=t.acquireVsCodeApi()}catch{Ft=null}return Ft}function Gg(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function Wg(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function yd(){let t=jg(),e={canOpenSource:!0};return{host:"vscode",theme:Gg(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return Wg(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var zg="0.3.0";function Vg(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is required");let o=new io(t,n);return o.setWorkflow(e),o}var qg={vscode(){return yd()}};return _d(Kg);})();
diff --git a/vscode-extension/src/authoredPanel.ts b/vscode-extension/src/authoredPanel.ts
index e8d25de2..7e4826c9 100644
--- a/vscode-extension/src/authoredPanel.ts
+++ b/vscode-extension/src/authoredPanel.ts
@@ -1169,10 +1169,11 @@ class AuthoredPanel implements vscode.Disposable {
             await this.openEvidence(m, requestId);
             return;
         }
-        // Viewer M3: the review walk ended. Its highlight goes, and a walk open still on its way
-        // (a notebook waiting for its cell editor) no longer lands.
+        // Viewer M3: the review walk ended (`end`), or moved to a claim it opens nothing for
+        // (`clear`: no quote, or a claim the reader only selected). Its highlight goes, and a walk
+        // open still on its way (a notebook waiting for its cell editor) no longer lands.
         if (m.type === 'walk') {
-            if (m.state === 'end')
+            if (m.state === 'end' || m.state === 'clear')
                 this.endWalk();
             return;
         }
@@ -1316,6 +1317,8 @@ class AuthoredPanel implements vscode.Disposable {
         const shown = this.lastValid;
         const evidence = shown?.document.evidence.find(x => x.id === id);
         if (!shown || !evidence) {
+            if (walk)
+                this.clearHighlight();
             answer({ outcome: 'blocked', reason: 'unknown', message: blockedOpenText('unknown', ''), warning: '' });
             return;
         }
@@ -1340,6 +1343,11 @@ class AuthoredPanel implements vscode.Disposable {
         // stepping through changed files); the webview shows the reason in its walk bar instead.
         if (outcome.outcome === 'blocked' && !walk && outcome.warning)
             void vscode.window.showWarningMessage(outcome.warning);
+        // Viewer M3 (step 11): a blocked walk open also clears the previous claim's highlight, so
+        // the editor beside never shows an earlier claim's lines while the walk says this claim's
+        // file was not opened. A blocked Enter, double-click or Open link keeps it, as in M2.
+        if (outcome.outcome === 'blocked' && walk)
+            this.clearHighlight();
         answer(outcome);
     }
     private async jumpTo(evidence: WorkflowEvidence, shown: ValidatedWorkflow, jump: Jump, options: { focus: boolean; highlight: boolean }, markBehind: () => void): Promise {
@@ -1439,7 +1447,10 @@ class AuthoredPanel implements vscode.Disposable {
         for (const [rel, signature] of signatures)
             this.jumpChecks.files.set(rel, { signature, stale: stale.find(s => s.rel === rel) });
     }
-    /** Viewer M3: the walk ended. Its highlight is cleared and an open still on its way is dropped. */
+    /**
+     * Viewer M3: the walk ended, or moved to a claim with nothing to open. Its highlight is cleared
+     * and an open still on its way is dropped.
+     */
     private endWalk(): void {
         this.jumpSeq++;
         this.clearHighlight();
diff --git a/vscode-extension/test/walk-host.test.js b/vscode-extension/test/walk-host.test.js
index 8a48cc8e..7ba3ba92 100644
--- a/vscode-extension/test/walk-host.test.js
+++ b/vscode-extension/test/walk-host.test.js
@@ -182,6 +182,54 @@ test('the walk end clears the highlight and drops a walk open still on its way;
   assert.equal(vscode.__recorded.decorationTypes[1].disposed, true, 'closing the panel cleared the highlight');
 });
 
+test('a walk clear (a claim with nothing to open) clears the highlight and drops a walk open on its way', async () => {
+  const { document, files } = twoFiles();
+  const { panel } = await open({ raw: document, files });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 1, 'the open did not highlight');
+  panel.fire({ v: 1, type: 'walk', state: 'clear' });
+  assert.equal(vscode.__recorded.decorationTypes[0].disposed, true, 'the clear removed the highlight');
+  // The walk goes on: the next open highlights again.
+  walkOpen(panel, 'e2', 2);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 2, 'the next open did not highlight');
+  assert.equal(vscode.__recorded.decorationTypes[1].disposed, false);
+});
+
+test('a walk clear drops a notebook open waiting for its cell editor', async () => {
+  const { panel } = await openNotebookPanel({ cellEditors: false });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.shownNotebooks.length === 1, 'the notebook open did not start');
+  panel.fire({ v: 1, type: 'walk', state: 'clear' });
+  await h.waitFor(() => openResults(panel).length === 1, 'the open was not answered', 3000);
+  assert.equal(openResults(panel)[0].outcome, 'cancelled');
+});
+
+test('a blocked walk open clears the previous claim\'s highlight; a blocked ordinary open keeps it', async () => {
+  const { document, files } = twoFiles();
+  // other.py is missing on disk, so its evidence is blocked; source.py is fresh.
+  const { panel } = await open({ raw: document, files: { 'source.py': files['source.py'] } });
+  walkOpen(panel, 'e', 1);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 1, 'the fresh open did not highlight');
+  // An ordinary open of the missing file (Enter, an Open link) keeps the highlight, as in M2.
+  panel.fire({ v: 1, type: 'openLocation', evidenceId: 'e2', requestId: 'plain1' });
+  await h.waitFor(() => openResults(panel).length === 2, 'the ordinary open was not answered');
+  assert.equal(openResults(panel)[1].outcome, 'blocked');
+  assert.equal(vscode.__recorded.decorationTypes[0].disposed, false, 'an ordinary blocked open leaves the highlight');
+  // The walk's own open of it clears it: the editor no longer shows the earlier claim's lines.
+  walkOpen(panel, 'e2', 2);
+  await h.waitFor(() => openResults(panel).length === 3, 'the walk open was not answered');
+  assert.equal(openResults(panel)[2].outcome, 'blocked');
+  assert.equal(vscode.__recorded.decorationTypes[0].disposed, true, 'a blocked walk open clears the highlight');
+  assert.equal(shown().length, 1, 'the missing file was never opened');
+  // Unknown evidence from the walk clears it too (nothing to show for it).
+  walkOpen(panel, 'e', 3);
+  await h.waitFor(() => vscode.__recorded.decorationTypes.length === 2, 'the fresh open did not highlight again');
+  walkOpen(panel, 'nope', 4);
+  await h.waitFor(() => openResults(panel).length === 5, 'the unknown open was not answered');
+  assert.equal(openResults(panel)[4].reason, 'unknown');
+  assert.equal(vscode.__recorded.decorationTypes[1].disposed, true);
+});
+
 test('the walk end drops a notebook open waiting for its cell editor', async () => {
   const { panel } = await openNotebookPanel({ cellEditors: false });
   walkOpen(panel, 'e', 1);
diff --git a/webview/dist/mlview.css b/webview/dist/mlview.css
index 18b4e882..f0e21e3e 100644
--- a/webview/dist/mlview.css
+++ b/webview/dist/mlview.css
@@ -1 +1 @@
-:root,.mlv-root[data-theme=light]{--mlv-font: var(--vscode-font-family, ui-sans-serif, -apple-system, "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif);--mlv-font-mono: var(--vscode-editor-font-family, "Cascadia Code", "JetBrains Mono", Consolas, ui-monospace, monospace);--mlv-fs-10: 10.5px;--mlv-fs-11: 11px;--mlv-fs-12: 12px;--mlv-fs-13: 13px;--mlv-fs-14: 14px;--mlv-fs-16: 16px;--mlv-fs-20: 20px;--mlv-compact-title: 11.2px;--mlv-lh-tight: 1.35;--mlv-lh-body: 1.5;--mlv-fw-regular: 450;--mlv-fw-medium: 550;--mlv-fw-semi: 650;--mlv-track-caps: .04em;--mlv-s1: 2px;--mlv-s2: 4px;--mlv-s3: 6px;--mlv-s4: 8px;--mlv-s5: 12px;--mlv-s6: 16px;--mlv-s7: 20px;--mlv-s8: 24px;--mlv-s9: 32px;--mlv-s10: 48px;--mlv-r-chip: 4px;--mlv-r-btn: 6px;--mlv-r-node: 10px;--mlv-r-lane: 14px;--mlv-r-panel: 12px;--mlv-r-pill: 999px;--mlv-sh-1: 0 1px 2px rgba(16, 18, 24, .06), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 4px 12px rgba(16, 18, 24, .1), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 16px 40px rgba(16, 18, 24, .18), 0 0 0 1px var(--mlv-border-strong);--mlv-dur-1: .12s;--mlv-dur-2: .18s;--mlv-dur-3: .26s;--mlv-ease: cubic-bezier(.2, .8, .2, 1);--mlv-flow-speed: 220;--mlv-flow-pulse-speed: 320;--mlv-flow-head: 12px;--mlv-flow-gap: 34px;--mlv-flow-gap-call: 96px;--mlv-flow-gap-back: 24px;--mlv-flow-dur-data: .21s;--mlv-flow-dur-call: .49s;--mlv-flow-dur-back: 165ms;--mlv-flow-dur-min: .38s;--mlv-flow-dur-max: 2.2s;--mlv-flow-hop: 90ms;--mlv-flow-width: 3px;--mlv-flow-port-r: 3.5px;--mlv-flow-color: var(--mlv-accent);--mlv-flow-halo-opacity: .18;--mlv-flow-glow-opacity: .42;--mlv-flow-core-width: 1.6;--mlv-flow-underlay-opacity: .28;--mlv-node-w: 216px;--mlv-node-w-lg: 248px;--mlv-node-w-sm: 176px;--mlv-node-h: 72px;--mlv-rail-w: 4px;--mlv-group-header-h: 34px;--mlv-lane-pad: 20px;--mlv-header-h: 36px;--mlv-status-h: 22px;--mlv-rail-width: 360px;--mlv-bg: var(--vscode-editor-background, #FBFBFD);--mlv-surface: var(--vscode-editorWidget-background, #FFFFFF);--mlv-surface-2: 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diff --git a/webview/dist/mlview.js b/webview/dist/mlview.js
index 5f119be4..1bd3eb53 100644
--- a/webview/dist/mlview.js
+++ b/webview/dist/mlview.js
@@ -1,9 +1,9 @@
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i=o;_(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),_(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),_(i,"pointerenter",()=>n.enterEdge(e)),_(i,"pointerleave",()=>n.leaveEdge(e)),_(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),_(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),_(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Cn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new hn;this.mountSerial=ps();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new kn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new xn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new Ln,this.canvasEl.appendChild(this.toasts.root),this.viewport=new yn(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Sl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new _n({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new In({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Sn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new 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this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=kr(this.index,this.collapsedSet),this.routes=Or(this.index,this.frameData,this.collapsedSet),this.labelPlan=hs(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?vn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=Xr({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,l)=>kl(s,r,l,n),wireEdge:(s,r)=>Ll(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,go(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=Yr(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(ml(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(gl(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return 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e=[];for(let n of this.index.graph.nodes||[])this.index.isGroup(n.id)&&e.push(n.id);return this.collapsedSet=new Set(e),this.relayout(),this.viewport.fitWhole(),this.host.afterCollapse(),this.host.announce("Overview: "+e.length+(e.length===1?" group":" groups")+" collapsed, whole diagram fitted."),e.length}expandAncestors(e){if(!this.index)return!1;let n=!1;for(let o of this.index.ancestors(e))this.collapsedSet.delete(o)&&(n=!0);return n&&this.relayout(),n}centerOnNode(e,n){if(!this.index||!this.frameData)return;let o=this.index.visibleRepresentative(e,this.collapsedSet),i=this.frameData.boxes.get(o);if(!i||(this.viewport.centerOn(i),!n))return;let s=this.nodeEls.get(o);s&&(s.classList.add("is-pulse"),setTimeout(()=>s.classList.remove("is-pulse"),700))}revealNode(e,n){if(!this.index||!this.frameData)return;let o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Fe){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else 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n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Hr(this.index,this.frameData,o,n):Uo(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Tl='button, [role="button"], a[href], select';function Rl(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var Tn=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(_(e,"keydown",o=>this.onKey(o))),this.disposers.push(_(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Tl),n=Rl(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function De(t,e=si()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Ol=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Hl=["svg","png","copy-svg"],Jf=0,Rn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Jf;this.button=ne("mlv-btn mlv-btn--icon mlv-btn--more","More actions"),this.button.title="More: legend, flow, fit, export, shortcuts",this.button.appendChild(D("more",16)),this.button.setAttribute("aria-haspopup","menu"),this.button.setAttribute("aria-expanded","false"),this.button.setAttribute("aria-controls",o),_(this.button,"click",s=>{s.preventDefault(),s.stopPropagation(),this.setOpen(!this.openState)}),_(this.button,"keydown",s=>{if(s.key==="Escape"){if(!this.openState)return;s.preventDefault(),s.stopPropagation(),this.setOpen(!1);return}s.key!=="ArrowDown"&&s.key!=="ArrowUp"||(s.preventDefault(),s.stopPropagation(),this.setOpen(!0),this.focusItem(s.key==="ArrowDown"?0:this.shown().length-1))}),this.panel=f("div","mlv-moremenu"),this.panel.id=o,this.panel.setAttribute("role","menu"),this.panel.setAttribute("aria-label","More actions"),this.panel.hidden=!0;for(let s of Ol){if(s.group){let l=g(this.panel,f("div","mlv-moremenu__sep"));l.setAttribute("role","separator"),l.setAttribute("data-sep-before",s.id)}let r=f("button","mlv-moremenu__item");r.type="button",r.tabIndex=-1,r.setAttribute("role",s.check?"menuitemcheckbox":"menuitem"),r.setAttribute("data-more-item",s.id),Hl.indexOf(s.id)>=0&&r.setAttribute("data-export-action",s.id),s.folded&&r.setAttribute("data-folded","1"),r.appendChild(D(s.icon,14)),g(r,f("span","mlv-moremenu__label",s.label)),s.id==="minimap"&&(g(r,f("span","mlv-moremenu__note")).hidden=!0),s.keys&&g(r,f("kbd","mlv-moremenu__keys",De(s.keys))).setAttribute("aria-hidden","true"),_(r,"click",l=>{if(l.preventDefault(),r.disabled)return;let a=l.detail===0;this.setOpen(!1),this.onPick(s.id,a)}),this.panel.appendChild(r),this.items.set(s.id,r)}_(this.panel,"keydown",s=>this.onKey(s));let i=typeof document>"u"?null:document;i&&(this.disposers.push(_(i,"pointerdown",s=>{if(!this.openState)return;let r=s.target;r&&(this.panel.contains(r)||this.button.contains(r))||this.setOpen(!1)})),this.disposers.push(_(i,"keydown",s=>{if(!this.openState||s.key!=="Escape")return;s.preventDefault(),s.stopPropagation();let r=i.activeElement,l=!!r&&(this.panel.contains(r)||this.button.contains(r));this.setOpen(!1),l&&this.focusButton()},!0)))}get open(){return this.openState}update(e){for(let[o,i]of this.items){let s=Ol.find(l=>l.id===o),r=!s.folded||(o==="search"?e.folded.search:o==="about"?e.folded.about:e.folded.exceptions);if(i.hidden=!r,o==="about"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.aboutLabel),i.title="Show About: the request, coverage, limitations and provenance"}if(o==="exceptions"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.exceptionsLabel),i.title=e.exceptionsOn?"The observed claims are faded; choose to show them again":"Fade the observed claims so these stand out"}if(o==="rail"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.railMode==="sheet"?"Bottom panel":"Side panel"),i.title=e.railMode==="sheet"?"Open or collapse the bottom panel":"Show or hide the side panel"}if(s.check){let l=o==="legend"?e.legendOpen:o==="flow"?e.flowOn:o==="minimap"?e.minimapShown&&!e.minimapUnavailable:o==="exceptions"?e.exceptionsOn:e.railOpen;i.setAttribute("aria-checked",l?"true":"false")}if(o==="minimap"){let l=i.querySelector(".mlv-moremenu__note");l&&(l.textContent=e.minimapUnavailable||"",l.hidden=!e.minimapUnavailable),i.disabled=!!e.minimapUnavailable,i.title=e.minimapUnavailable?"Overview map: "+e.minimapUnavailable.charAt(0).toLowerCase()+e.minimapUnavailable.slice(1):"Show or hide the overview map"}o==="zoomsel"&&(i.disabled=!e.hasSelection),Hl.indexOf(o)>=0&&(i.disabled=!e.canExport),i.disabled?i.setAttribute("aria-disabled","true"):i.removeAttribute("aria-disabled")}let n=this.shown()[0];for(let o of Array.from(this.panel.querySelectorAll(".mlv-moremenu__sep")))o.hidden=!!n&&o.getAttribute("data-sep-before")===n.getAttribute("data-more-item")}setOpen(e){if(this.openState!==e)if(this.openState=e,this.panel.hidden=!e,this.button.setAttribute("aria-expanded",e?"true":"false"),e){try{this.beforeOpen()}catch{}this.position(),this.focusItem(0)}else{let n=this.panel.ownerDocument?this.panel.ownerDocument.activeElement:null;n&&this.panel.contains(n)&&this.focusButton()}}shown(){return Array.from(this.items.values()).filter(e=>!e.hidden&&!e.disabled)}position(){let e=null;try{e=this.button.getBoundingClientRect()}catch{e=null}e&&(this.panel.style.position="fixed",this.panel.style.top=Math.round(e.bottom+4)+"px",this.panel.style.left="auto",this.panel.style.right=Math.max(8,Math.round(ep()-e.right))+"px")}focusItem(e){let n=this.shown();if(!n.length)return;let o=(e%n.length+n.length)%n.length;try{n[o].focus()}catch{}}focusButton(){try{this.button.focus()}catch{}}onKey(e){if(e.key==="Escape"){e.preventDefault(),e.stopPropagation(),this.setOpen(!1);return}if(e.key==="Tab"){this.setOpen(!1);return}let n=this.shown(),o=n.indexOf(e.target);if(!(o<0)){if(e.key==="ArrowDown")this.focusItem(o+1);else if(e.key==="ArrowUp")this.focusItem(o-1);else if(e.key==="Home")this.focusItem(0);else if(e.key==="End")this.focusItem(n.length-1);else return;e.preventDefault(),e.stopPropagation()}}destroy(){for(let e of this.disposers)try{e()}catch{}this.disposers=[]}};function ep(){try{if(typeof window<"u"&&window.innerWidth)return window.innerWidth}catch{}return 1280}var ri={mid:620,wide:1e3,full:1200};function tp(t){return t>0?tt+" "+(t===1?e:n);function Nl(t){let e=t.steps+t.connections+t.findings,n=[];return t.steps&&n.push(ke(t.steps,"step","steps")),t.connections&&n.push(ke(t.connections,"connection","connections")),t.findings&&n.push(ke(t.findings,"finding","findings")),e+" not observed ("+n.join(", ")+")"}function np(t){let e=t.coverage.limitations.length;return"Coverage: "+t.coverage.status+(e?" · "+ke(e,"limitation","limitations"):"")}var Pl=4;function op(t){let e=t.steps+t.connections+t.findings;return e+(e===1?" claim":" claims")+" not observed"}var ip=0,On=class{constructor(e,n){this.sevButtons=new Map;this.roving=null;this.layout="full";this.width=0;this.fitLevel=0;this.hasDocument=!1;this.hasExceptions=!1;this.sevShown=new Set;this.searchOpen=!1;this.lastAboutLabel="About this revision";this.state=null;this.cb=e;let o="mlv"+ ++ip;this.header=f("header","mlv-header"),this.header.setAttribute("data-layout",this.layout),this.title=g(this.header,f("h1","mlv-header__title","")),this.toolbar=g(this.header,f("div","mlv-header__bar")),this.toolbar.setAttribute("role","toolbar"),this.toolbar.setAttribute("aria-label","Diagram controls"),this.toolbar.setAttribute("aria-orientation","horizontal"),this.provenance=f("button","mlv-chip mlv-header__prov"),this.provenance.type="button",g(this.provenance,f("span","mlv-header__dot")).setAttribute("aria-hidden","true"),this.provHost=g(this.provenance,f("span","mlv-header__host","")),this.provRev=g(this.provenance,f("span","mlv-header__rev","")),_(this.provenance,"click",a=>e.onAbout(a.detail===0)),this.toolbar.appendChild(this.provenance),g(this.toolbar,f("span","mlv-header__spacer")),this.search=g(this.toolbar,f("div","mlv-search")),g(this.search,D("search",14)).setAttribute("class","mlv-uicon mlv-search__glyph");let s=g(this.search,f("label","mlv-sr","Search steps, findings, IDs, or cited text"));s.htmlFor=o+"-search-input",this.searchInput=g(this.search,f("input","mlv-input")),this.searchInput.id=o+"-search-input",this.searchInput.type="search",this.searchInput.placeholder="Search steps and findings",this.searchInput.setAttribute("role","combobox"),this.searchInput.setAttribute("aria-expanded","false"),this.searchInput.setAttribute("aria-controls",o+"-search-results"),this.searchInput.autocomplete="off",this.results=g(this.search,f("ul","mlv-search__results")),this.results.id=o+"-search-results",this.results.setAttribute("role","listbox"),this.results.setAttribute("aria-label","Search results"),this.results.hidden=!0,_(this.searchInput,"input",()=>e.onQuery(this.searchInput.value)),_(this.searchInput,"keydown",a=>e.onSearchKey(a)),_(this.searchInput,"blur",()=>{this.searchInput.value||this.setSearchOpen(!1)}),this.searchBtn=ne("mlv-btn mlv-btn--icon mlv-header__searchbtn","Search ("+De("Mod+F")+")"),this.searchBtn.appendChild(D("search",16)),this.searchBtn.setAttribute("aria-controls",this.searchInput.id),_(this.searchBtn,"click",()=>e.onSearchOpen()),this.toolbar.appendChild(this.searchBtn);for(let a of Z){let d=f("button","mlv-chip mlv-chip--btn mlv-chip--sev");d.type="button",d.setAttribute("aria-pressed","true"),d.setAttribute("data-severity",a),d.appendChild(U(a,14,"")),g(d,f("span","mlv-chip__count","0")),_(d,"click",()=>e.onSeverity(a)),this.sevButtons.set(a,d),this.toolbar.appendChild(d)}this.sevUnit=g(this.toolbar,f("span","mlv-header__unit","findings")),this.sevUnit.setAttribute("aria-hidden","true"),this.sevUnit.hidden=!0,this.exceptionsBtn=f("button","mlv-chip mlv-chip--btn mlv-chip--exceptions"),this.exceptionsBtn.type="button",this.exceptionsBtn.setAttribute("aria-pressed","false"),this.exceptionsBtn.hidden=!0,_(this.exceptionsBtn,"click",()=>e.onToggleExceptions(this.exceptionsBtn.getAttribute("aria-pressed")!=="true")),this.toolbar.appendChild(this.exceptionsBtn),this.more=new Rn((a,d)=>this.pick(a,d),()=>e.onMenuOpen()),this.toolbar.appendChild(this.more.button),this.refineSlot=g(this.toolbar,f("span","mlv-header__refine")),this.status=f("footer","mlv-status"),this.status.setAttribute("data-layout",this.layout),this.counts=g(this.status,f("span","mlv-status__counts","")),this.coverage=f("button","mlv-status__coverage"),this.coverage.type="button",this.coverage.hidden=!0,_(this.coverage,"click",a=>e.onAbout(a.detail===0)),this.status.appendChild(this.coverage),g(this.status,f("span","mlv-status__spacer")),this.fresh=g(this.status,f("span","mlv-status__freshness"));let r=ne("mlv-btn mlv-btn--icon mlv-zoom__btn","Zoom out");r.appendChild(D("minus",12)),_(r,"click",()=>e.onZoom(-1));let l=ne("mlv-btn mlv-btn--icon mlv-zoom__btn","Zoom in");l.appendChild(D("plus",12)),_(l,"click",()=>e.onZoom(1)),n.insertBefore(r,n.firstChild),n.appendChild(l),this.status.appendChild(n),this.roving=new Tn(this.toolbar)}destroy(){this.roving&&this.roving.destroy(),this.roving=null,this.more.destroy()}syncRoving(){this.fitRow()}setWidth(e){let n=tp(e),o=n!==this.layout;return o&&(this.layout=n,this.header.setAttribute("data-layout",n),this.status.setAttribute("data-layout",n),this.syncSearch()),(o||e!==this.width)&&(this.width=e,this.fitRow()),n}get headerFit(){return this.fitLevel}get headerLayout(){return this.layout}setSearchOpen(e){this.searchOpen=e,this.syncSearch(),this.fitRow()}syncSearch(){let n=!(this.layout==="mid"||this.layout==="narrow")||this.searchOpen||!!this.searchInput.value;this.header.setAttribute("data-search",n?"open":"closed"),this.searchBtn.setAttribute("aria-expanded",n?"true":"false"),this.syncControls()}syncControls(){this.provenance.hidden=!this.hasDocument||this.layout==="narrow"||this.fitLevel>=1;let e=(this.layout==="mid"||this.layout==="narrow")&&this.header.getAttribute("data-search")!=="open";this.searchBtn.hidden=!(this.layout==="mid"&&e),this.exceptionsBtn.hidden=!this.hasExceptions||this.fitLevel>=2;for(let[n,o]of this.sevButtons)o.hidden=!this.sevShown.has(n)||this.fitLevel>=4;this.sevUnit.hidden=this.sevShown.size===0||this.fitLevel>=4,this.header.setAttribute("data-fit",String(this.fitLevel))}fitRow(){this.fitLevel=0,this.syncControls();let e=this.header.clientWidth,n=this.header.getAttribute("data-search")==="open"&&(this.layout==="mid"||this.layout==="narrow")?Pl:Pl-1;if(e>0)for(;this.fitLevelthis.header.clientWidth;)this.fitLevel++,this.syncControls();this.updateMenu(),this.roving&&this.roving.sync()}updateMenu(){let e=this.state;if(!e)return;let n=e.notObserved,o=this.hasExceptions&&this.fitLevel>=2;this.more.update({folded:{search:this.layout==="narrow",about:this.layout==="narrow"||this.fitLevel>=1,exceptions:o},aboutLabel:this.lastAboutLabel,exceptionsLabel:this.hasExceptions?Nl(n):"",exceptionsOn:e.exceptionsOn,legendOpen:e.legendOpen,flowOn:e.flowOn,minimapShown:!e.minimapCollapsed,minimapUnavailable:e.minimapUnavailable,railOpen:e.railOpen,railMode:e.railMode,hasSelection:e.hasSelection,canExport:!!e.graph})}pick(e,n){let 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L=tc(c.points,c.mid,y.rect);L.moved&&o.nudged++,o.placed++,y.flipped&&o.flipped++,y.shift>0&&o.shifted++,w&&o.fallback++,r.add(y.rect),n.set(c.id,{id:c.id,text:u,x:y.x,y:y.y,rect:y.rect,hidden:!1,flipped:y.flipped,axis:S?S.axis:"h",laneId:x?x.id:null,fallback:w,shifted:y.shift,marker:L.point,always:d})}}return{placements:n,stats:o}}function xo(t,e,n){return tn?n:t}function Se(t){return Math.round(t*100)/100}var nc=["data","call","control","config","state","loop","output"],oc={data:"data",dataflow:"data","data flow":"data",flow:"data",control:"control","control flow":"control",branch:"control","conditional call":"control",decision:"control",state:"state","state update":"state",update:"state","state read":"state","state copy":"state",gradient:"state","gradient flow":"state",optimizes:"state",ownership:"state","state ownership":"state",config:"config",configuration:"config","configuration 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i=o;k(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),k(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),k(i,"pointerenter",()=>n.enterEdge(e)),k(i,"pointerleave",()=>n.leaveEdge(e)),k(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),k(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),k(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Pn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new bn;this.mountSerial=Ls();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new Rn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new Mn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new On,this.canvasEl.appendChild(this.toasts.root),this.viewport=new _n(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Fl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new An({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new Nn({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Cn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new 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Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,So(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=al(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(Il(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(Al(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,l=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+l+(l===1?" step":" steps")+" hidden.":" expanded."))}overview(){if(!this.index)return 0;let 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o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Le){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else r&&(l=this.edgeEls.get(r)?.querySelector(".mlv-edge__hit"));if(l)try{l.focus()}catch{}}frameIssue(e){if(!this.index||!this.frameData)return;let n=this.index.issueById.get(e);if(!n)return;let o=[],i=[];for(let d of n.nodeIds){let c=this.targetRect({kind:"node",id:d});c&&o.push(c)}for(let d of n.edgeIds){let c=this.targetRect({kind:"edge",id:d});c&&i.push(c)}let s=o.concat(i);if(!s.length)return;let r=d=>{let c=Math.min(...d.map(h=>h.x)),u=Math.min(...d.map(h=>h.y));return{x:c,y:u,w:Math.max(...d.map(h=>h.x+h.w))-c,h:Math.max(...d.map(h=>h.y+h.h))-u}},l=r(s),a=!o.length||!i.length||this.viewport.fitsAt(l,Sn)?l:r(o);this.viewport.frameRect(a,s[0],At),n.nodeIds[0]&&this.pulseNode(this.index.visibleRepresentative(n.nodeIds[0],this.collapsedSet))}revealEdge(e){let n=this.targetRect({kind:"edge",id:e});n&&(this.viewport.vp.zoomn.classList.remove("is-pulse"),700))}zoomStep(e){let n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Ur(this.index,this.frameData,o,n):ti(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Vl='button, [role="button"], a[href], select';function ql(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var rt=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(k(e,"keydown",o=>this.onKey(o))),this.disposers.push(k(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Vl),n=ql(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function Ge(t,e=fi()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Kl=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"review",label:"Review the claims",icon:"review",keys:"R",group:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Ul=["svg","png","copy-svg"],Ep=0,Fn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Ep;this.button=ne("mlv-btn mlv-btn--icon mlv-btn--more","More actions"),this.button.title="More: legend, flow, fit, export, shortcuts",this.button.appendChild(H("more",16)),this.button.setAttribute("aria-haspopup","menu"),this.button.setAttribute("aria-expanded","false"),this.button.setAttribute("aria-controls",o),k(this.button,"click",s=>{s.preventDefault(),s.stopPropagation(),this.setOpen(!this.openState)}),k(this.button,"keydown",s=>{if(s.key==="Escape"){if(!this.openState)return;s.preventDefault(),s.stopPropagation(),this.setOpen(!1);return}s.key!=="ArrowDown"&&s.key!=="ArrowUp"||(s.preventDefault(),s.stopPropagation(),this.setOpen(!0),this.focusItem(s.key==="ArrowDown"?0:this.shown().length-1))}),this.panel=f("div","mlv-moremenu"),this.panel.id=o,this.panel.setAttribute("role","menu"),this.panel.setAttribute("aria-label","More actions"),this.panel.hidden=!0;for(let s of Kl){if(s.group){let l=g(this.panel,f("div","mlv-moremenu__sep"));l.setAttribute("role","separator"),l.setAttribute("data-sep-before",s.id)}let r=f("button","mlv-moremenu__item");r.type="button",r.tabIndex=-1,r.setAttribute("role",s.check?"menuitemcheckbox":"menuitem"),r.setAttribute("data-more-item",s.id),Ul.indexOf(s.id)>=0&&r.setAttribute("data-export-action",s.id),s.folded&&r.setAttribute("data-folded","1"),r.appendChild(H(s.icon,14)),g(r,f("span","mlv-moremenu__label",s.label)),s.id==="minimap"&&(g(r,f("span","mlv-moremenu__note")).hidden=!0),s.keys&&g(r,f("kbd","mlv-moremenu__keys",Ge(s.keys))).setAttribute("aria-hidden","true"),k(r,"click",l=>{if(l.preventDefault(),r.disabled)return;let a=l.detail===0;this.setOpen(!1),this.onPick(s.id,a)}),this.panel.appendChild(r),this.items.set(s.id,r)}k(this.panel,"keydown",s=>this.onKey(s));let i=typeof document>"u"?null:document;i&&(this.disposers.push(k(i,"pointerdown",s=>{if(!this.openState)return;let r=s.target;r&&(this.panel.contains(r)||this.button.contains(r))||this.setOpen(!1)})),this.disposers.push(k(i,"keydown",s=>{if(!this.openState||s.key!=="Escape")return;s.preventDefault(),s.stopPropagation();let r=i.activeElement,l=!!r&&(this.panel.contains(r)||this.button.contains(r));this.setOpen(!1),l&&this.focusButton()},!0)))}get open(){return this.openState}update(e){for(let[o,i]of this.items){let s=Kl.find(l=>l.id===o),r=!s.folded||(o==="search"?e.folded.search:o==="about"?e.folded.about:e.folded.exceptions);if(i.hidden=!r,o==="about"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.aboutLabel),i.title="Show About: the request, coverage, limitations and provenance"}if(o==="exceptions"){let l=i.querySelector(".mlv-moremenu__label");l&&(l.textContent=e.exceptionsLabel),i.title=e.exceptionsOn?"The observed claims are faded; choose to show them again":"Fade the observed claims so these stand out"}if(o==="review"){let 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Focus stays here; Alt+Enter moves it to the editor."))}var Ag=["about","issues","inspector","outline"];function eo(t){if(!t||typeof t!="object")return null;let{kind:e,id:n}=t;return e!=="node"&&e!=="edge"&&e!=="issue"||typeof n!="string"||!n?null:{kind:e,id:n}}function to(t){return typeof t=="string"&&Ag.indexOf(t)>=0?t:null}function ud(t){return{focusSearch:()=>t.focusSearch(),escape:()=>t.dismissTopmost(),cycleIssue:e=>{if(t.walking())return t.walkFindings(e);let n=t.visibleIssues();if(!n.length)return!1;let o=t.selectedIssueId(),s=((o?n.findIndex(r=>r.id===o):-1)+(e?-1:1)+n.length)%n.length;return t.focusIssue(n[s].id),!0},zoom:e=>t.zoom(e),fit:()=>t.fit(),toggleFocusMode:()=>t.toggleFocusMode(),zoomToSelection:()=>t.zoomToSelection(),overview:()=>t.overview(),toggleLegend:()=>t.toggleLegend(),toggleFlow:()=>t.toggleFlow(),replayFlow:()=>t.replayFlow(),toggleCollapse:()=>t.collapseSelection(),openSelection:e=>t.openSelection(e),move:e=>t.move(e),toggleSeverity:e=>{let n=Z[e];n&&t.toggleSeverity(n)},toggleRail:()=>t.toggleRail(),focusRailTabs:()=>t.focusRailTabs(),toggleShortcuts:()=>t.toggleShortcuts(),cycleConnections:e=>t.cycleConnections(e),walking:()=>t.walking(),review:()=>t.review(),walkStep:e=>t.walkStep(e),walkQuote:e=>t.walkQuote(e),walkNotObserved:e=>t.walkNotObserved(e)}}function hd(t){return{focusSearch:()=>t.focusSearch(),dismissTopmost:()=>{if(t.sheetOpen())t.toggleShortcuts(!1);else{if(t.closeHeaderPanels())return!0;if(t.legendOpen())t.closeLegend();else{if(t.endWalk())return!0;if(t.collapseSheet())return!0;if(t.view().isFocusLocked)t.view().toggleFocusMode(t.selection());else if(t.selection())t.view().blurFocusedEdge(),t.clearSelection();else{let e=t.view().canvasEl,n=e.ownerDocument?e.ownerDocument.activeElement:null;if(!n||!e.contains(n))return!1;e.blur()}}}return!0},visibleIssues:()=>t.visibleIssues(),selectedIssueId:()=>{let e=t.selection();return e&&e.kind==="issue"?e.id:null},focusIssue:e=>t.focusIssue(e),zoom:e=>t.view().zoomStep(e),fit:()=>t.view().fit(),toggleFocusMode:()=>t.view().toggleFocusMode(t.selection()),zoomToSelection:()=>t.zoomToSelection(),overview:()=>t.view().overview(),toggleLegend:()=>t.toggleLegend(),toggleFlow:()=>t.toggleFlow(),replayFlow:()=>t.view().flow.replay()?(t.announce("Playing the connection flow again."),!0):!1,collapseSelection:()=>{let e=t.selection(),n=t.index();if(!e||e.kind!=="node"||!n)return!1;let o=n.isGroup(e.id)?e.id:n.parentOf.get(e.id)||null;return!o||!n.isGroup(o)?!1:(t.view().toggleCollapse(o),!0)},openSelection:e=>t.openSelection(e),move:e=>t.move(e),toggleSeverity:e=>t.toggleSeverity(e),toggleRail:()=>t.toggleRail(),focusRailTabs:()=>t.focusRailTabs(),toggleShortcuts:()=>t.toggleShortcuts(),cycleConnections:e=>Cg(t,e),walking:()=>t.walking(),review:()=>t.review(),walkStep:e=>t.walkStep(e),walkQuote:e=>t.walkQuote(e),walkNotObserved:e=>t.walkJump("notObserved",e),walkFindings:e=>t.walkJump("findings",e)}}function Cg(t,e){let n=t.selection(),o=null;if(n&&n.kind==="node"?o=n.id:n&&n.kind==="edge"&&(o=t.edgeAnchor()),!o)return!1;let i=t.view().incidentRoutes(o);if(!i.length)return t.view().toast("That node has no connections in this view."),!0;let s=n&&n.kind==="edge"?n.id:null,r=-1;for(let a=0;at.view,index:()=>t.index,selection:()=>t.selection,edgeAnchor:()=>t.edgeAnchor,setEdgeAnchor:e=>{t.edgeAnchor=e},select:e=>t.select(e),clearSelection:()=>t.clearSelection(),focusSearch:()=>t.focusSearch(),visibleIssues:()=>Rg(t),focusIssue:e=>t.focusIssue(e,{fromList:"issues"}),openSelection:e=>{let n=t.selection;if(!n)return!1;if(t.walk.active&&t.walkOwns(n))return t.walk.reopen(e);let o=t.locOf(n);return o&&t.openLocation(o,e),!0},zoomToSelection:()=>t.zoomToSelection(),move:e=>Og(t,e),toggleSeverity:e=>t.applyFilters(()=>t.filters.toggleSeverity(e)),toggleRail:()=>t.toggleRail(),focusRailTabs:()=>t.focusRailTabs(),toggleShortcuts:e=>t.toggleShortcuts(e),sheetOpen:()=>t.sheet.open,closeHeaderPanels:()=>t.closeHeaderPanels(),collapseSheet:()=>t.collapseSheet(!1),announce:e=>t.announce(e),toggleLegend:()=>t.setLegend(!t.legendOpen),legendOpen:()=>t.legendOpen,closeLegend:()=>t.setLegend(!1),toggleFlow:()=>t.setFlow(!t.flowOn),walking:()=>t.walk.active,endWalk:()=>t.walk.stop(),review:()=>t.walk.toggle(),walkStep:e=>t.walk.step(e),walkQuote:e=>t.walk.stepQuote(e),walkJump:(e,n)=>t.walk.jump(e,n)})}function Rg(t){return t.graph?t.graph.issues.filter(t.filters.keep):[]}function Og(t,e){let n=t.selection,o=t.view.nextSelection(n&&n.kind==="node"?n.id:null,e);if(!o)return;t.select({kind:"node",id:o.id},{center:!o.visible});let i=t.view.nodeElement(o.id);i&&i.focus()}function no(t,e,n){if(!e||typeof e!="object")return;e.filters&&t.filters.restore(e.filters);let o=to(e.railTab);if(o&&(t.railTab=o),Array.isArray(e.collapsed)){t.collapsedState=e.collapsed.slice();let s=t.index;s&&t.view.setCollapsed(e.collapsed.filter(r=>s.isGroup(r)))}let i=eo(e.selection);n&&i&&(t.selection=i),typeof e.minimapCollapsed=="boolean"&&t.view.setMinimapCollapsed(e.minimapCollapsed),typeof e.flow=="boolean"&&t.setFlow(e.flow),typeof e.legendOpen=="boolean"&&t.setLegend(e.legendOpen),n&&t.index&&(t.view.relayout(),K(t),U(t),t.view.applySelection(t.selection)),e.viewport&&t.view.viewport.set(e.viewport)}function pd(t){Jn(t);let e={viewport:{...t.viewportState},selection:t.selection?{...t.selection}:null,collapsed:t.collapsedState.slice(),filters:t.filters.snapshot(),railTab:t.railTab,minimapCollapsed:t.view.minimapCollapsed};if(t.flowOn||(e.flow=!1),t.legendOpen&&(e.legendOpen=!0),t.graph&&t.workflowRevision){e.workflowRevision=t.workflowRevision;let n=Os(t.root);n&&(e.composer=n),t.railMode==="sheet"&&t.railOpen&&(e.sheetOpen=!0);let o=t.walk.viewState();o&&(e.walk=o)}return e}function md(t){try{return t.loadState()}catch{return null}}function gd(t,e){ls(e,{init:(n,o)=>{t.caps=o||t.caps,t.setTheme(n),K(t),U(t)},workflow:n=>{n!==t.workflowDocument&&t.setWorkflow(n)},workflowStatus:n=>Fs(t,n),hostNotice:(n,o)=>t.showHostNotice(n,o),stale:n=>t.setStale(n),actionResult:n=>t.onActionResult(n),theme:n=>t.setTheme(n),revealNode:(n,o)=>t.focusNode(n,{center:o,pulse:!0}),revealIssue:n=>t.focusIssue(n),restoreState:n=>no(t,n,!0),onUnknown:n=>t.bridge.post({v:1,type:"log",level:"debug",message:"ignored unknown message type: "+n})})}var Hg=150,Ng=100;function Pg(t){if(!t||typeof t!="object")return null;let e=t,n=typeof e.filter=="string"&&at.indexOf(e.filter)>=0?e.filter:null,o=e.claim;if(!n||!o||typeof o!="object"||o.kind!=="node"&&o.kind!=="edge"&&o.kind!=="issue"||typeof o.id!="string"||!o.id)return null;let i={filter:n,claim:{kind:o.kind,id:o.id}},s=e.quote;return typeof s=="number"&&Number.isInteger(s)&&s>0&&s!!this.app.freshness.reasonOf(e);this.app=e}index(){return this.app.index}claims(){let e=this.index();return e?(e!==this.orderIndex&&(this.order=ta(e),this.orderIndex=e),this.order):[]}changedOffered(){return na(this.app.freshness.list().map(e=>e.reason))}counts(){let e=this.index();return e?sa(this.claims(),e,this.isStale):{notObserved:0,findings:0,changed:0,all:0}}offered(){return ra(this.counts(),this.changedOffered())}listFor(e){let n=this.index();return n?ia(this.claims(),e,n,this.isStale):[]}current(){return this.position>=0&&this.position=0?i.filter:o.indexOf("notObserved")>=0?"notObserved":"all";let r=this.listFor(s);if(!r.length)return this.app.announce("This revision has no claims to walk."),!1;let l=this.active;l||this.app.openRailForWalk(),this.filter=s,this.list=r;let a=i?i.claim:null;return this.position=Math.max(0,ct(r,a,this.claims())),this.quote=i&&le(i.claim,this.current())?Math.min(i.quote||0,Math.max(0,this.currentLocs().length-1)):0,this.active=!0,l||this.app.onWalkShown(!0),this.show(!0),!0}stop(e=!0){return this.active?(this.active=!1,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"end"}),this.remember(),this.app.onWalkShown(!1),e&&this.app.announce("Review ended. r resumes it here."),this.app.saveSoon(),!0):!1}toggle(){this.active?this.stop():this.start()}step(e){if(!this.active||!this.list.length)return!1;let n=Math.max(0,Math.min(this.list.length-1,this.position+e));return n===this.position?(this.app.announce(e>0?"Claim "+this.list.length+" of "+this.list.length+" is the last one.":"Claim 1 of "+this.list.length+" is the first one."),!0):(this.position=n,this.quote=0,this.show(!0),!0)}stepQuote(e){if(!this.active)return!1;let n=this.currentLocs();if(n.length<2)return this.app.announce(n.length?"This claim has one quote.":"This claim cites no 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":" claims. ")+this.announcement())}reopen(e){return!this.active||!this.current()?!1:(this.cancelTimer(),this.sendOpen(e),!0)}openQuote(e,n){if(!this.active||!e.evidenceId)return!1;let o=this.currentLocs().findIndex(i=>i.evidenceId===e.evidenceId);return o<0?!1:(this.quote=o,this.cancelTimer(),this.sendOpen(n),this.remember(),!0)}followSelection(e){if(!this.active||this.selecting||!e)return;let n=this.list.findIndex(o=>le(o,e));n<0||n===this.position||(this.position=n,this.quote=0,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("idle"),this.remember(),this.render())}onDocument(e){let n=this.app.workflowRevision;e&&(this.active&&this.stop(!1),this.remembered=null,this.list=[],this.position=-1);let o=this.restored;if(this.restored=null,o&&o.revision===n&&!this.remembered){this.remembered={revision:n,state:o.state},o.state.active&&this.resume();return}if(!this.active)return;let i=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,ct(this.list,i,this.claims())),this.render()}resume(){let e=this.remembered?this.remembered.state:null;if(!e)return;let n=this.offered();this.filter=n.indexOf(e.filter)>=0?e.filter:"all",this.list=this.listFor(this.filter),this.list.length&&(this.position=Math.max(0,ct(this.list,e.claim,this.claims())),this.quote=le(e.claim,this.current())?Math.min(e.quote||0,Math.max(0,this.currentLocs().length-1)):0,this.active=!0,this.app.onWalkShown(!0),this.show(!1))}onStale(){if(!this.active)return;this.offered().indexOf(this.filter)<0&&(this.filter="all");let e=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,ct(this.list,e,this.claims())),this.render()}onResult(e,n){if(!(!this.active||n!==this.latestSeq||e.outcome==="cancelled")){if(e.outcome==="done")this.status=this.statusFor("done");else{let o=e.message||(e.outcome==="blocked"?"Not opened.":"VS Code could not show the file.");this.status=this.statusFor(e.outcome,o),this.app.announce((e.outcome==="blocked"?"Not opened: ":"Failed: ")+o)}this.render()}}cancelTimer(){this.timer!==null&&clearTimeout(this.timer),this.timer=null}statusFor(e,n){let o=this.currentLocs(),i=Math.min(this.quote,Math.max(0,o.length-1)),s={state:e,quote:i,quotes:o.length};return o[i]&&e!=="none"&&e!=="unavailable"&&(s.loc=o[i]),n&&(s.message=n),s}localBlock(e){let n=e.evidenceId?this.app.freshness.reasonOf(e.file):void 0;return n?e.file+": "+ae[n]+"; not opened.":null}scheduleOpen(){this.cancelTimer();let e=this.currentLocs(),n=e[Math.min(this.quote,e.length-1)];if(!e.length||!n)this.status=this.statusFor("none");else if(!this.app.caps.canOpenSource)this.status=this.statusFor("unavailable");else{let o=this.localBlock(n);this.status=o?this.statusFor("blocked",o):this.statusFor("opening")}this.status.state!=="unavailable"&&(this.timer=setTimeout(()=>{this.timer=null,this.sendOpen(!1)},Hg))}get pendingOpen(){return this.timer!==null}flushOpen(){this.timer!==null&&(this.cancelTimer(),this.sendOpen(!1))}sendOpen(e){if(!this.active)return;let n=this.currentLocs(),o=n[Math.min(this.quote,n.length-1)];if(!o){this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("none"),this.render();return}if(!this.app.caps.canOpenSource){this.status=this.statusFor("unavailable"),this.render();return}let i=++this.seq;this.latestSeq=i,this.remember(),this.app.bridge.saveState(this.app.getState());let s=Yi(o);s.walk=!0,s.seq=i,e&&(s.focus=!0),this.app.postRequest(s,l=>this.onResult(l,i));let r=this.localBlock(o);this.status=r?this.statusFor("blocked",r):this.statusFor("opening"),this.render()}show(e){let n=this.current();if(n){this.selecting=!0;try{this.app.showWalkClaim(n)}finally{this.selecting=!1}e?this.scheduleOpen():this.status=this.statusFor(this.currentLocs().length?this.app.caps.canOpenSource?"idle":"unavailable":"none"),this.remember(),this.render(),this.app.announce(this.announcement()),this.app.saveSoon()}}announcement(){let e=this.index(),n=this.current();return e&&n?aa(this.position,this.list.length,this.filter,e,n):""}render(e=!1){this.app.renderWalkBar(),Ei(this.app.rail.root,this.paneMark(),e)}paneMark(){if(!this.active)return null;let e=this.current();return!e||!le(e,this.app.selection)?null:{quote:this.status.quote,status:this.status}}remember(){let e=this.app.workflowRevision,n=this.current();if(!e||!n)return;let o={filter:this.filter,claim:{kind:n.kind,id:n.id}};this.quote>0&&(o.quote=this.quote),this.active&&(o.active=!0),this.remembered={revision:e,state:o}}viewState(){let e=this.app.workflowRevision;if(!this.remembered||!e||this.remembered.revision!==e)return;let n={...this.remembered.state,claim:{...this.remembered.state.claim}};return this.active?n.active=!0:delete n.active,n}restore(e,n){let o=Pg(n);this.restored=o?{revision:e,state:o}:null}destroy(){this.cancelTimer()}};var Fg=32,Zi=900,Bg=620,Dg=.47,vd=.25,bd=.75,io=class{constructor(e,n){this.graph=null;this.index=null;this.edgeAnchor=null;this.flowOn=!0;this.exceptionsOn=!1;this.filters=new Wt;this.viewportState={x:0,y:0,zoom:1};this.selection=null;this.collapsedState=[];this.railTab="about";this.legendOpen=!1;this.freshness=new Gt;this.openHintShown=!1;this.railOpen=!0;this.railChosen=!1;this.dockedHidden=!1;this.railWidth=360;this.railMode="docked";this.sheetFraction=Dg;this.paneColumns=1;this.workflowDocument=null;this.workflowRevision=null;this.restoredView=null;this.restoredComposer=null;this.restoredTab=null;this.restoredSelection=null;this.restoredSheet=null;this.pending=new Map;this.requestSerial=0;this.disposers=[];this.destroyed=!1;this.releasePage=()=>{};this.saveSoon=$i(()=>this.bridge.saveState(this.getState()),250);this.root=e,this.bridge=n,this.caps=n.capabilities,this.themes=new zt(e,n.theme||"light"),this.doubleClick=new on(e),this.disposers.push(()=>this.doubleClick.dispose()),this.walk=new oo(this),dd(this);let o=md(n);o&&no(this,o,!1),o&&typeof o.workflowRevision=="string"&&o.viewport&&(this.restoredView={revision:o.workflowRevision,viewport:{...o.viewport}});let i=o&&typeof o.workflowRevision=="string"?Ns(o.composer):null;o&&i&&(this.restoredComposer={revision:o.workflowRevision,composer:i});let s=o&&typeof o.workflowRevision=="string"?to(o.railTab):null;o&&s&&(this.restoredTab={revision:o.workflowRevision,tab:s});let r=o&&typeof o.workflowRevision=="string"?eo(o.selection):null;o&&r&&(this.restoredSelection={revision:o.workflowRevision,selection:r}),o&&typeof o.workflowRevision=="string"&&o.sheetOpen===!0&&(this.restoredSheet=o.workflowRevision),o&&typeof o.workflowRevision=="string"&&this.walk.restore(o.workflowRevision,o.walk),this.disposers.push(n.onMessage(l=>this.onMessage(l))),typeof window<"u"&&this.disposers.push(k(window,"resize",()=>this.onResize())),this.disposers.push(k(e,"keydown",l=>{l.defaultPrevented||!(l.ctrlKey||l.metaKey)||l.altKey||l.key!=="f"&&l.key!=="F"||this.modalOpen(l.target)||(l.preventDefault(),this.focusSearch())})),this.disposers.push(k(e,"keydown",l=>{l.key!=="Escape"||l.defaultPrevented||!this.walk.active||this.modalOpen(l.target)||this.walk.stop()&&l.preventDefault()})),this.chrome.setWidth(this.rootWidth()),this.view.setPanelWidth(this.rootWidth())}rootWidth(){let e=this.root.getBoundingClientRect().width;return e>0?e:0}onResize(){let e=this.chrome.headerLayout;this.chrome.setWidth(this.rootWidth())!==e&&(K(this),this.renderWalkBar()),this.view.setPanelWidth(this.rootWidth()),this.autoRail(),this.paneColumns!==this.selectionColumns()&&U(this)}selectionColumns(){return this.railMode==="sheet"&&this.rootWidth()>=Bg?2:1}railShown(){return this.railOpen}refreshChrome(){K(this)}focusSearch(){this.chrome.setSearchOpen(!0),this.search.focus()}showAbout(e={}){this.railTab="about",this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon();let n=e.at==="limitations"?this.rail.revealLimitations():e.focus?this.rail.activePanel():null;if(e.focus&&n)try{n.focus()}catch{}this.announce(e.at==="limitations"?"About: the coverage limitations.":"About this revision shown.")}modalOpen(e){if(this.sheet&&this.sheet.open||Mo(this))return!0;let n=e;return!!n&&typeof n.closest=="function"&&!!n.closest(".mlv-sheet, .mlv-workflow__composer")}closeHeaderPanels(){return Lo(this,!0)}headerPanelOpen(){return Mo(this)}setWorkflow(e,n){let o=this.workflowRevision!==e.revision.id,i=n;if(!n||!n.viewport){let r=null;this.graph&&this.workflowRevision===e.revision.id?r={...this.viewportState}:!this.graph&&this.restoredView&&this.restoredView.revision===e.revision.id&&(r={...this.restoredView.viewport}),r&&(i={...n||{},viewport:r})}this.restoredView=null;let s=this.restoredComposer&&this.restoredComposer.revision===e.revision.id?this.restoredComposer.composer:null;if(this.restoredComposer=null,this.workflowRevision!==e.revision.id){let r=!this.graph&&this.restoredTab&&this.restoredTab.revision===e.revision.id?this.restoredTab.tab:null;this.railTab=r||"about"}if(this.restoredTab=null,!this.graph){let r=l=>l===e.revision.id;this.restoredSelection&&r(this.restoredSelection.revision)&&(this.selection=this.restoredSelection.selection),r(this.restoredSheet)&&(this.railChosen=!0,this.railOpen=!0)}this.restoredSelection=null,this.restoredSheet=null,this.workflowDocument=e,this.workflowRevision=e.revision.id,this.autoRail(),ld(this,nn(e),i,!0),Bs(this,e,s),this.legendOtherKinds(),this.view.afterChromeChange(),this.walk.onDocument(o),this.syncNoticeReview()}postRequest(e,n){this.requestSerial+=1;let o="";for(let s=0;s<4;s++)o+=Math.floor(Math.random()*36).toString(36);let i="r"+this.requestSerial.toString(36)+"-"+o;for(this.pending.set(i,n);this.pending.size>Fg;){let s=this.pending.keys().next().value;if(s===void 0)break;this.pending.delete(s)}return this.bridge.post({...e,requestId:i}),i}onActionResult(e){if(!e||typeof e.requestId!="string")return;let n=this.pending.get(e.requestId);n&&(this.pending.delete(e.requestId),n(e))}openLocation(e,n=!1){cd(this,e,n)}setStale(e){this.freshness.set(e)&&(this.view.setStale(this.freshness.list()),this.index&&this.view.refresh(this.selection),K(this),U(this),this.walk.onStale(),this.syncNoticeReview())}showHostNotice(e,n){let o=!!n&&n.length===1&&n[0]==="checking";if(this.freshness.checking!==o&&(this.freshness.checking=o,K(this)),o)return;let i=this.notice.root.hidden;this.notice.update(e,n),this.syncNoticeReview();let s=this.root.querySelector(".mlv-body");s&&this.notice.root.nextSibling!==s&&this.root.insertBefore(this.notice.root,s),this.graph&&i!==this.notice.root.hidden&&this.view.afterChromeChange()}syncNoticeReview(){let e=this.graph&&this.walk.changedOffered()?this.walk.counts().changed:0;this.notice.setReview(e,this.walk.active)}renderWalkBar(){if(!this.walkBar)return;let e=this.walk;if(!e.active){this.walkBar.update(null);return}this.walkBar.update({position:e.position,total:e.list.length,filter:e.filter,counts:e.counts(),offered:e.offered(),status:e.status,narrow:this.chrome.headerLayout==="narrow"})}onWalkShown(e){this.renderWalkBar(),K(this),this.syncNoticeReview(),e||U(this),this.graph&&this.view.afterSheetToggle()}openRailForWalk(){this.railMode!=="docked"||this.railOpen||(this.railChosen=!0,this.setRailOpen(!0))}walkOwns(e){return le(this.walk.current(),e)}showWalkClaim(e){let n=this.index;if(!n)return;let o=r=>{let l=n.edgeById.get(r);l&&(this.view.expandAncestors(l.source),this.view.expandAncestors(l.target))};if(e.kind==="issue"){let r=n.issueById.get(e.id);if(!r)return;for(let l of r.nodeIds)this.view.expandAncestors(l);for(let l of r.edgeIds)o(l)}else e.kind==="node"?this.view.expandAncestors(e.id):o(e.id);this.select(e,{tab:"inspector",showClaim:!0}),e.kind==="issue"?this.view.frameIssue(e.id):this.view.revealTarget({kind:e.kind,id:e.id});let i=this.view.canvasEl,s=i.ownerDocument?i.ownerDocument.activeElement:null;if(s&&s!==i&&i.contains(s))try{i.focus()}catch{}}setMinimapCollapsed(e){this.view.setMinimapCollapsed(e),K(this),this.saveSoon(),this.announce("Overview minimap "+(e?"hidden":"shown")+".")}setLegend(e){this.legendOpen=e,this.legend.setOpen(e),K(this),this.saveSoon()}setRailTab(e){this.railTab=e,this.railMode==="sheet"&&!this.railOpen&&(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon()}showRailTab(e){this.railTab=e,this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon(),this.railMode==="sheet"&&this.rail.focusTab(e)}focusRailTabs(){this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.rail.focusTab(this.railTab)}toggleRail(){this.railChosen=!0,this.railMode==="docked"&&(this.dockedHidden=this.railOpen),this.setRailOpen(!this.railOpen)}collapseSheet(e=!1){if(this.railMode!=="sheet"||!this.railOpen)return!1;if(this.railChosen=!0,this.setRailOpen(!1),this.announce("Bottom panel collapsed."),e)try{this.view.canvasEl.focus()}catch{}return!0}sheetFractionMax(){let e=this.root.querySelector(".mlv-body"),n=e?e.getBoundingClientRect().height:0;if(!(n>0))return bd;let o=Math.min(240,.45*n);return Math.max(vd,Math.min(bd,(n-o)/n))}setSheetFraction(e){let n=Math.max(vd,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Zi?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),U(this),K(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&K(this),e&&this.rail&&U(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Zi>=280?n-Zi:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),K(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),K(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),U(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),this.walk.followSelection(e),n&&n.open)if(this.walk.active&&this.walkOwns(e))this.walk.reopen(!!n.focusEditor);else{let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),U(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(_l()){let n=pa(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),K(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),U(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){fd(this,e)}onMessage(e){gd(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;if(this.walk.active&&this.walkOwns(this.selection)){this.walk.reopen(n);return}let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return pd(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.walk.destroy(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.walkBar.destroy(),this.view.destroy(),this.releasePage(),N(this.root),this.root.classList.remove("mlv-root")}}};var Ft=null;function jg(){if(Ft)return Ft;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Ft=t.acquireVsCodeApi()}catch{Ft=null}return Ft}function Gg(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function Wg(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function yd(){let t=jg(),e={canOpenSource:!0};return{host:"vscode",theme:Gg(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return Wg(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var zg="0.3.0";function Vg(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is required");let o=new io(t,n);return o.setWorkflow(e),o}var qg={vscode(){return yd()}};return _d(Kg);})();
diff --git a/webview/src/app.ts b/webview/src/app.ts
index 947e89d6..6dd37db9 100644
--- a/webview/src/app.ts
+++ b/webview/src/app.ts
@@ -17,6 +17,7 @@
  *   `app/keys.ts`       the keyboard binding
  *   `app/messages.ts`   the host protocol, inbound
  *   `app/state.ts`      `ViewState`, both directions
+ *   `app/walk.ts`       the review walk (viewer M3)
  *
  * Those modules are this class's own halves, not an API: every field and method
  * below is public only because they reach it, and nothing outside `app/` may
@@ -47,6 +48,9 @@ import { applyState, safeLoad, snapshotState } from './app/state.js';
 import { sanitizeRailTab, sanitizeSelection } from './ui/commands.js';
 import { screenReaderActive } from './motion.js';
 import { selectionAnnouncement } from './ui/selection.js';
+import { ReviewWalk } from './app/walk.js';
+import { WalkBar } from './ui/walkbar.js';
+import { sameClaim } from './walk.js';
 import type { SearchHit } from './search.js';
 import type {
   ActionResult,
@@ -214,6 +218,9 @@ export class App implements MLViewApp {
   notice!: HostNotice;
   /** Viewer M1 review: the second click of a double-click opens what the first one selected. */
   doubleClick: DoubleClickOpener;
+  /** Viewer M3: the review walk, and its bar at the foot of the diagram (above the bottom sheet). */
+  walk: ReviewWalk;
+  walkBar!: WalkBar;
 
   saveSoon = debounce(() => this.bridge.saveState(this.getState()), 250);
 
@@ -224,6 +231,7 @@ export class App implements MLViewApp {
     this.themes = new ThemeController(root, bridge.theme || 'light');
     this.doubleClick = new DoubleClickOpener(root);
     this.disposers.push(() => this.doubleClick.dispose());
+    this.walk = new ReviewWalk(this);
     buildAppUi(this);
     const restored = safeLoad(bridge);
     if (restored) applyState(this, restored, false);
@@ -237,6 +245,8 @@ export class App implements MLViewApp {
     const selection = restored && typeof restored.workflowRevision === 'string' ? sanitizeSelection(restored.selection) : null;
     if (restored && selection) this.restoredSelection = { revision: restored.workflowRevision as string, selection };
     if (restored && typeof restored.workflowRevision === 'string' && restored.sheetOpen === true) this.restoredSheet = restored.workflowRevision;
+    // Viewer M3: the review walk's place, for the revision it was saved with.
+    if (restored && typeof restored.workflowRevision === 'string') this.walk.restore(restored.workflowRevision, restored.walk);
     this.disposers.push(bridge.onMessage((msg) => this.onMessage(msg)));
     if (typeof window !== 'undefined') this.disposers.push(on(window, 'resize', () => this.onResize()));
     // Viewer M2: the find key (Cmd+F on macOS, Ctrl+F elsewhere) focuses the search from anywhere
@@ -252,6 +262,17 @@ export class App implements MLViewApp {
       ev.preventDefault();
       this.focusSearch();
     }));
+    // Viewer M3: Escape always ends the review walk, wherever the focus is in the viewer (the
+    // header, a docked rail), not only on the canvas, whose cascade ends it first. A surface that
+    // used the Escape itself (a menu, the shortcut sheet, the Refine… popover, the search box)
+    // marks it handled first, and a modal surface keeps it. Marked handled here, so the panel's
+    // bootstrap keeps VS Code from also acting on it.
+    this.disposers.push(on(root, 'keydown', (ev: KeyboardEvent) => {
+      if (ev.key !== 'Escape' || ev.defaultPrevented || !this.walk.active) return;
+      if (this.modalOpen(ev.target)) return;
+      if (!this.walk.stop()) return;
+      ev.preventDefault();
+    }));
     this.chrome.setWidth(this.rootWidth());
     this.view.setPanelWidth(this.rootWidth());
     // No `ready` here: the host bootstrap posts the one `ready` of a page load
@@ -270,7 +291,11 @@ export class App implements MLViewApp {
   /** The panel was resized: the header's shape and the rail's width rule follow it. */
   private onResize(): void {
     const before = this.chrome.headerLayout;
-    if (this.chrome.setWidth(this.rootWidth()) !== before) renderChrome(this);
+    if (this.chrome.setWidth(this.rootWidth()) !== before) {
+      renderChrome(this);
+      // Viewer M3: the walk bar's narrow form follows the header's.
+      this.renderWalkBar();
+    }
     this.view.setPanelWidth(this.rootWidth());
     this.autoRail();
     // The sheet's Selection pane changes between one and two columns at 620 px.
@@ -356,6 +381,7 @@ export class App implements MLViewApp {
    * for this same revision is restored instead of fitting (VIEWUI-3).
    */
   setWorkflow(document: WorkflowDocument, preserve?: Partial): void {
+    const revisionChanged = this.workflowRevision !== document.revision.id;
     let next = preserve;
     if (!preserve || !preserve.viewport) {
       let viewport: Viewport | null = null;
@@ -398,6 +424,9 @@ export class App implements MLViewApp {
     // The header is built after the fit ran; refit a viewport nobody moved to
     // the canvas that is actually left (issue 1).
     this.view.afterChromeChange();
+    // Viewer M3: another revision ends the walk and starts it fresh; a remount brings it back.
+    this.walk.onDocument(revisionChanged);
+    this.syncNoticeReview();
   }
 
   /**
@@ -444,6 +473,9 @@ export class App implements MLViewApp {
     if (this.index) this.view.refresh(this.selection);
     renderChrome(this);
     renderRail(this);
+    // Viewer M3: the walk's Changed files filter and the notice's "Review affected claims" follow.
+    this.walk.onStale();
+    this.syncNoticeReview();
   }
 
   /**
@@ -460,11 +492,102 @@ export class App implements MLViewApp {
     if (checking) return;
     const before = this.notice.root.hidden;
     this.notice.update(message, codes);
+    this.syncNoticeReview();
     const body = this.root.querySelector('.mlv-body');
     if (body && this.notice.root.nextSibling !== body) this.root.insertBefore(this.notice.root, body);
     if (this.graph && before !== this.notice.root.hidden) this.view.afterChromeChange();
   }
 
+  /* ── the review walk (viewer M3) ────────────────────────────────────── */
+
+  /** The stale notice offers "Review affected claims" while claims cite a changed file. */
+  syncNoticeReview(): void {
+    const count = this.graph && this.walk.changedOffered() ? this.walk.counts().changed : 0;
+    this.notice.setReview(count, this.walk.active);
+  }
+
+  /** The walk bar for the walk's state, or hidden. */
+  renderWalkBar(): void {
+    if (!this.walkBar) return;
+    const walk = this.walk;
+    if (!walk.active) {
+      this.walkBar.update(null);
+      return;
+    }
+    this.walkBar.update({
+      position: walk.position,
+      total: walk.list.length,
+      filter: walk.filter,
+      counts: walk.counts(),
+      offered: walk.offered(),
+      status: walk.status,
+      narrow: this.chrome.headerLayout === 'narrow',
+    });
+  }
+
+  /**
+   * The walk started or ended: the bar above the bottom sheet shows or goes, Review is pressed or not,
+   * the notice's action follows, and the canvas, which changed height, keeps its picture (no refit)
+   * with the selection in view, as for the bottom sheet.
+   */
+  onWalkShown(shown: boolean): void {
+    this.renderWalkBar();
+    renderChrome(this);
+    this.syncNoticeReview();
+    if (!shown) renderRail(this);
+    if (this.graph) this.view.afterSheetToggle();
+  }
+
+  /** Starting the walk shows a docked rail the reader hid (the walk reads claims in its Selection tab). */
+  openRailForWalk(): void {
+    if (this.railMode !== 'docked' || this.railOpen) return;
+    this.railChosen = true;
+    this.setRailOpen(true);
+  }
+
+  /** The walk's current claim is `sel`. */
+  walkOwns(sel: Sel | null): boolean {
+    return sameClaim(this.walk.current(), sel);
+  }
+
+  /**
+   * One step of the walk on the canvas: the claim's boxes are drawn (a collapsed group around it
+   * opens), it is selected and shown in the Selection tab (a collapsed bottom sheet opens), and it
+   * is brought into view above the sheet: a finding frames every step it cites; a step or a
+   * connection is zoomed to reading size when the diagram is below it, else panned the least
+   * distance that shows it whole. The keyboard stays on the diagram: a card or connection that
+   * held the focus hands it to the canvas, so the walk's keys keep answering there.
+   */
+  showWalkClaim(claim: Sel): void {
+    const index = this.index;
+    if (!index) return;
+    const expandEnds = (edgeId: string) => {
+      const edge = index.edgeById.get(edgeId);
+      if (!edge) return;
+      this.view.expandAncestors(edge.source);
+      this.view.expandAncestors(edge.target);
+    };
+    if (claim.kind === 'issue') {
+      const issue = index.issueById.get(claim.id);
+      if (!issue) return;
+      for (const id of issue.nodeIds) this.view.expandAncestors(id);
+      for (const id of issue.edgeIds) expandEnds(id);
+    } else if (claim.kind === 'node') this.view.expandAncestors(claim.id);
+    else expandEnds(claim.id);
+    this.select(claim, { tab: 'inspector', showClaim: true });
+    if (claim.kind === 'issue') this.view.frameIssue(claim.id);
+    else this.view.revealTarget({ kind: claim.kind, id: claim.id });
+    const canvas = this.view.canvasEl;
+    const active = canvas.ownerDocument ? (canvas.ownerDocument.activeElement as HTMLElement | null) : null;
+    if (active && active !== canvas && canvas.contains(active)) {
+      try {
+        canvas.focus();
+      } catch (_e) {
+        /* the canvas may already be torn down */
+      }
+    }
+  }
+
   /** VIEW-12: the toolbar's copy of the minimap chevron. */
   setMinimapCollapsed(next: boolean): void {
     this.view.setMinimapCollapsed(next);
@@ -720,9 +843,15 @@ export class App implements MLViewApp {
     else if (opts && opts.center) this.view.centerOnNode(sel.id, !!opts.pulse);
     else if (openedRail && sel.kind !== 'issue') this.view.keepInView({ kind: sel.kind, id: sel.id });
     this.announceSelection();
+    // Viewer M3: a selection the reader made while walking moves the walk there when it holds it.
+    this.walk.followSelection(sel);
     if (opts && opts.open) {
-      const loc = this.locOf(sel);
-      if (loc) this.openLocation(loc, !!opts.focusEditor);
+      // Viewer M3: opening the walk's own claim (Enter, a double-click) opens its current quote.
+      if (this.walk.active && this.walkOwns(sel)) this.walk.reopen(!!opts.focusEditor);
+      else {
+        const loc = this.locOf(sel);
+        if (loc) this.openLocation(loc, !!opts.focusEditor);
+      }
     }
     this.saveSoon();
   }
@@ -896,6 +1025,11 @@ export class App implements MLViewApp {
   openIssue(id: string, focusEditor = false): void {
     this.focusIssue(id, { fromList: 'issues' });
     if (!this.selection || this.selection.kind !== 'issue' || this.selection.id !== id) return;
+    // Viewer M3: the walk's own claim opens as the walk's current quote.
+    if (this.walk.active && this.walkOwns(this.selection)) {
+      this.walk.reopen(focusEditor);
+      return;
+    }
     const loc = this.locOf({ kind: 'issue', id });
     if (loc) this.openLocation(loc, focusEditor);
   }
@@ -916,6 +1050,7 @@ export class App implements MLViewApp {
     if (this.destroyed) return;
     this.destroyed = true;
     this.saveSoon.cancel();
+    this.walk.destroy();
     this.pending.clear();
     for (const dispose of this.disposers) {
       try {
@@ -927,6 +1062,7 @@ export class App implements MLViewApp {
     this.disposers = [];
     this.themes.destroy();
     this.chrome.destroy();
+    this.walkBar.destroy();
     this.view.destroy();
     this.releasePage();
     clear(this.root);
diff --git a/webview/src/app/actions.ts b/webview/src/app/actions.ts
index 77602442..c061c9e4 100644
--- a/webview/src/app/actions.ts
+++ b/webview/src/app/actions.ts
@@ -11,7 +11,31 @@
 import { STALE_TEXT } from '../freshness.js';
 import { fileLine } from '../dom.js';
 import type { App } from '../app.js';
-import type { Loc, RelatedLoc } from '../types.js';
+import type { Loc, RelatedLoc, UiToHost } from '../types.js';
+
+type OpenFrame = Extract;
+
+/**
+ * The `openLocation` frame for a cited range. Preserve the frozen legacy frame byte-for-byte:
+ * authored evidence adds identifiers only when it actually has them. The review walk (viewer M3)
+ * adds `seq`, `walk` and a request id to the same frame.
+ */
+export function locationFrame(loc: Loc | RelatedLoc): OpenFrame {
+  const message: OpenFrame = {
+    v: 1,
+    type: 'openLocation',
+    file: loc.file,
+    absFile: loc.absFile,
+    line: loc.line,
+    col: loc.col,
+    endLine: loc.endLine,
+    endCol: loc.endCol,
+    preview: true,
+  };
+  if (loc.evidenceId) message.evidenceId = loc.evidenceId;
+  if (loc.evidenceId && loc.cell !== undefined) message.cell = loc.cell;
+  return message;
+}
 
 /**
  * Ask the host to open a cited range beside the panel (viewer M1). The host selects and
@@ -33,21 +57,7 @@ export function openLocation(app: App, loc: Loc | RelatedLoc, focusEditor = fals
   // the active editor. Persist synchronously before handing control to the
   // host; the ordinary debounced save can be lost with the document.
   app.bridge.saveState(app.getState());
-  const message: any = {
-    v: 1,
-    type: 'openLocation',
-    file: loc.file,
-    absFile: loc.absFile,
-    line: loc.line,
-    col: loc.col,
-    endLine: loc.endLine,
-    endCol: loc.endCol,
-    preview: true,
-  };
-  // Preserve the frozen legacy frame byte-for-byte. Authored evidence adds
-  // identifiers only when it actually has them.
-  if (loc.evidenceId) message.evidenceId = loc.evidenceId;
-  if (loc.evidenceId && loc.cell !== undefined) message.cell = loc.cell;
+  const message = locationFrame(loc);
   if (focusEditor) message.focus = true;
   app.bridge.post(message);
   // What the host is asked to do, not a claim that it did it (VW-10).
diff --git a/webview/src/app/build.ts b/webview/src/app/build.ts
index 811ae8fe..b3988bab 100644
--- a/webview/src/app/build.ts
+++ b/webview/src/app/build.ts
@@ -21,6 +21,7 @@ import { buildShell, claimPage } from '../ui/shell.js';
 import { ShortcutSheet } from '../ui/shortcuts.js';
 import { SearchController } from '../ui/searchcontroller.js';
 import { HostNotice } from '../ui/hostnotice.js';
+import { WalkBar } from '../ui/walkbar.js';
 import { runExport } from './exporting.js';
 import { renderChrome, renderRail } from './surfaces.js';
 import { syncCollapsed } from './documents.js';
@@ -56,17 +57,48 @@ export function buildAppUi(app: App): void {
     onShortcuts: () => app.toggleShortcuts(true),
     // The menu reads the state as it opens (the selection changes without a chrome repaint).
     onMenuOpen: () => renderChrome(app),
+    // Viewer M3: the header's Review button and the ... menu's item start or end the walk.
+    onReview: () => app.walk.toggle(),
   }, shell.zoomBar);
 
   // The header is the first thing after the skip link; the ... menu's panel goes on the app root,
   // so the header's roving toolbar (VIEW-12) keeps its single tab stop.
   app.root.appendChild(app.chrome.header);
+  // Viewer M3: the review walk's bar, shown only while the walk runs. It goes at the foot of the
+  // diagram column, after the canvas in the document: directly above the bottom sheet's tabs (or,
+  // with the side panel, along the bottom of the diagram). So the canvas keeps its place within
+  // four Tab presses of the top, and Tab from the canvas reaches the walk's controls, then the
+  // claim in the sheet.
+  app.walkBar = new WalkBar({
+    onFilter: (filter) => app.walk.setFilter(filter),
+    onExit: () => {
+      app.walk.stop();
+      focusCanvas(app);
+    },
+    onKey: (ev) => {
+      const key = ev.key;
+      if (key === 'j' || key === 'J') return app.walk.step(1);
+      if (key === 'k' || key === 'K') return app.walk.step(-1);
+      if (key === ']') return app.walk.stepQuote(1);
+      if (key === '[') return app.walk.stepQuote(-1);
+      if (key === 'u' || key === 'U') return app.walk.jump('notObserved', ev.shiftKey);
+      if (key === 'n' || key === 'N' || key === 'p' || key === 'P') return app.walk.jump('findings', key === 'p' || key === 'P');
+      return false;
+    },
+  });
   // Viewer M1: the host's banner after the mount (stale files, the root hint, a refused update).
   // It moves under the header when it is first shown (App.showHostNotice).
-  app.notice = new HostNotice({ onWorkspaceHint: (action) => app.bridge.post({ v: 1, type: 'workspaceHint', action }) });
+  app.notice = new HostNotice({
+    onWorkspaceHint: (action) => app.bridge.post({ v: 1, type: 'workspaceHint', action }),
+    // Viewer M3: the stale notice's "Review affected claims" walks the claims that cite those files.
+    onReviewAffected: () => {
+      if (app.walk.start('changed')) focusCanvas(app);
+    },
+  });
   app.root.appendChild(app.notice.root);
   app.root.appendChild(shell.body);
   shell.body.appendChild(shell.main);
+  shell.main.appendChild(app.walkBar.root);
 
   app.search = new SearchController(app.chrome.searchInput, app.chrome.results, {
     index: () => app.index,
@@ -102,7 +134,10 @@ export function buildAppUi(app: App): void {
     onShowIssue: (id) => app.focusIssue(id),
     onChallenge: () => openComposer(app, 'challenge'),
     onRefine: () => openComposer(app, null),
-    onOpen: (loc, focusEditor) => app.openLocation(loc, focusEditor),
+    // Viewer M3: an Open link of the claim the walk is on opens it as the walk's quote.
+    onOpen: (loc, focusEditor) => {
+      if (!app.walk.openQuote(loc, !!focusEditor)) app.openLocation(loc, focusEditor);
+    },
     onResize: (w) => app.setRailWidth(w),
     onSelectLane: (laneId) => app.selectLane(laneId),
     onToggleCollapse: (id) => {
@@ -110,7 +145,12 @@ export function buildAppUi(app: App): void {
     },
     onShowLimitations: () => app.showAbout({ at: 'limitations', focus: true }),
     onSheetToggle: () => app.toggleRail(),
-    onSheetCollapse: () => app.collapseSheet(true),
+    // Viewer M3: Escape inside the open sheet ends a running walk first (one Escape always ends it)
+    // and gives the focus back to the diagram; otherwise it collapses the sheet, as in M2.
+    onSheetCollapse: () => {
+      if (app.walk.stop()) focusCanvas(app);
+      else app.collapseSheet(true);
+    },
     onSheetResize: (fraction) => app.setSheetFraction(fraction),
     sheetFraction: () => app.sheetFraction,
     sheetFractionMax: () => app.sheetFractionMax(),
@@ -140,6 +180,15 @@ export function buildAppUi(app: App): void {
   app.setRailOpen(app.railOpen);
 }
 
+/** Give the keyboard back to the diagram. */
+function focusCanvas(app: App): void {
+  try {
+    app.view.canvasEl.focus();
+  } catch (_e) {
+    /* the canvas may already be torn down */
+  }
+}
+
 /** What the canvas is allowed to ask of the application. */
 export function canvasHost(app: App): CanvasHost {
   const openNode = (id: string, focusEditor: boolean) =>
diff --git a/webview/src/app/keys.ts b/webview/src/app/keys.ts
index 5d0dbc53..620f4147 100644
--- a/webview/src/app/keys.ts
+++ b/webview/src/app/keys.ts
@@ -41,6 +41,8 @@ function commandPort(app: App): CommandPort {
     openSelection: (focusEditor) => {
       const sel = app.selection;
       if (!sel) return false;
+      // Viewer M3: in the review walk, Enter opens the walk's current quote of this claim again.
+      if (app.walk.active && app.walkOwns(sel)) return app.walk.reopen(focusEditor);
       const loc = app.locOf(sel);
       if (loc) app.openLocation(loc, focusEditor);
       return true;
@@ -59,6 +61,12 @@ function commandPort(app: App): CommandPort {
     legendOpen: () => app.legendOpen,
     closeLegend: () => app.setLegend(false),
     toggleFlow: () => app.setFlow(!app.flowOn),
+    walking: () => app.walk.active,
+    endWalk: () => app.walk.stop(),
+    review: () => app.walk.toggle(),
+    walkStep: (delta) => app.walk.step(delta),
+    walkQuote: (delta) => app.walk.stepQuote(delta),
+    walkJump: (kind, backwards) => app.walk.jump(kind, backwards),
   });
 }
 
diff --git a/webview/src/app/state.ts b/webview/src/app/state.ts
index b38639f2..b88862b6 100644
--- a/webview/src/app/state.ts
+++ b/webview/src/app/state.ts
@@ -70,6 +70,9 @@ export function snapshotState(app: App): ViewState {
     if (composer) state.composer = composer;
     // Viewer M2 live fix: an open bottom sheet, absent when it is collapsed or the rail is docked.
     if (app.railMode === 'sheet' && app.railOpen) state.sheetOpen = true;
+    // Viewer M3: the review walk's place (filter, claim, quote, running), absent before a walk.
+    const walk = app.walk.viewState();
+    if (walk) state.walk = walk;
   }
   return state;
 }
diff --git a/webview/src/app/surfaces.ts b/webview/src/app/surfaces.ts
index a77f7bee..5a5c251c 100644
--- a/webview/src/app/surfaces.ts
+++ b/webview/src/app/surfaces.ts
@@ -10,6 +10,7 @@
 
 import { emptyCounts, normalizeSeverity } from '../markers.js';
 import { freshnessStatus } from '../freshness.js';
+import { isNotObserved } from '../walk.js';
 import type { App } from '../app.js';
 import type { NotObservedCounts } from '../ui/chrome.js';
 import type { IssueCounts, Severity } from '../types.js';
@@ -21,10 +22,10 @@ import type { IssueCounts, Severity } from '../types.js';
 export function notObservedCounts(app: App): NotObservedCounts {
   const out: NotObservedCounts = { steps: 0, connections: 0, findings: 0 };
   if (!app.graph) return out;
-  const exception = (basis: string | undefined) => !!basis && basis !== 'observed';
-  for (const node of app.graph.nodes) if (exception(node.basis)) out.steps++;
-  for (const edge of app.graph.edges) if (exception(edge.basis)) out.connections++;
-  for (const issue of app.graph.issues) if (exception(issue.basis)) out.findings++;
+  // Viewer M3: the same predicate as the review walk's Not observed filter, so the two counts agree.
+  for (const node of app.graph.nodes) if (isNotObserved(node.basis)) out.steps++;
+  for (const edge of app.graph.edges) if (isNotObserved(edge.basis)) out.connections++;
+  for (const issue of app.graph.issues) if (isNotObserved(issue.basis)) out.findings++;
   return out;
 }
 
@@ -60,6 +61,7 @@ export function renderChrome(app: App): void {
     notObserved,
     exceptionsOn: app.exceptionsOn,
     railMode: app.railMode,
+    walking: !!app.walk && app.walk.active,
   });
 }
 
@@ -85,5 +87,6 @@ export function renderRail(app: App): void {
     staleReason: (file) => app.freshness.reasonOf(file),
     document: app.graph ? app.workflowDocument : null,
     columns: app.paneColumns,
+    walk: app.walk ? app.walk.paneMark() : null,
   });
 }
diff --git a/webview/src/app/walk.ts b/webview/src/app/walk.ts
new file mode 100644
index 00000000..71682669
--- /dev/null
+++ b/webview/src/app/walk.ts
@@ -0,0 +1,562 @@
+/**
+ * The review walk (viewer M3, roadmap step 11): claim by claim through the displayed revision,
+ * each claim selected and revealed on the canvas, read in the Selection pane, and its cited lines
+ * shown and highlighted in the editor beside while the keyboard stays on the diagram.
+ *
+ * What it does on each step:
+ *   - the canvas selects the claim and brings it into view above the bottom sheet;
+ *   - the Selection pane shows it (a collapsed sheet opens);
+ *   - about 150 ms after the reader stops moving (`WALK_OPEN_DEBOUNCE_MS`) it asks the host to open
+ *     the claim's current quote beside the panel (`openLocation` with `walk: true`, a `seq` that
+ *     rises with every numbered open of this page, and a request id), focus kept here. The host
+ *     answers once: done, blocked (the reason, nothing opened, no notification), cancelled (a later
+ *     open overtook it) or failed. Only the answer to the latest open is shown. A claim with
+ *     nothing to open sends `walk: clear`, so the editor never keeps an earlier claim's highlight;
+ *   - a live region announces "Claim 3 of 16, not observed: Step …, inferred.".
+ *
+ * Owner decisions (M3): each step opens AUTOMATICALLY with preserveFocus; the walk records NO
+ * verdict and no "checked" mark, only its place, per revision, in the webview's saved view state
+ * (`ViewState.walk`). Nothing is written to evals or decisions. Opening, filtering and walking
+ * never call a model.
+ */
+
+import { locationFrame } from './actions.js';
+import { applyWalkMark } from '../ui/selection.js';
+import {
+  changedOffered,
+  claimBasis,
+  claimLocs,
+  claimOrder,
+  FILTER_LABEL,
+  filterClaims,
+  filterCounts,
+  isNotObserved,
+  offeredFilters,
+  positionFor,
+  sameClaim,
+  walkAnnouncement,
+  walkLocText,
+  WALK_FILTERS,
+} from '../walk.js';
+import { STALE_TEXT } from '../freshness.js';
+import type { App } from '../app.js';
+import type { GraphIndex } from '../layout/model.js';
+import type { Claim, WalkFilter, WalkOpenStatus } from '../walk.js';
+import type { ActionResult, Loc, Sel, WalkViewState } from '../types.js';
+
+/** The pause after the last step before the walk asks the host to open the cited lines. */
+export const WALK_OPEN_DEBOUNCE_MS = 150;
+
+/** A saved quote index is never trusted past this (a claim cites at most 100 evidence ids). */
+const MAX_QUOTE = 100;
+
+/** A saved walk, validated field by field (saved state comes from the webview's storage). */
+export function sanitizeWalk(value: unknown): WalkViewState | null {
+  if (!value || typeof value !== 'object') return null;
+  const record = value as Record;
+  const filter = typeof record.filter === 'string' && (WALK_FILTERS as readonly string[]).indexOf(record.filter) >= 0 ? (record.filter as WalkFilter) : null;
+  const claim = record.claim as { kind?: unknown; id?: unknown } | null | undefined;
+  if (!filter || !claim || typeof claim !== 'object') return null;
+  if ((claim.kind !== 'node' && claim.kind !== 'edge' && claim.kind !== 'issue') || typeof claim.id !== 'string' || !claim.id) return null;
+  const out: WalkViewState = { filter, claim: { kind: claim.kind, id: claim.id } };
+  const quote = record.quote;
+  if (typeof quote === 'number' && Number.isInteger(quote) && quote > 0 && quote < MAX_QUOTE) out.quote = quote;
+  if (record.active === true) out.active = true;
+  return out;
+}
+
+export class ReviewWalk {
+  /** The walk is running: the bar is shown and the walk keys answer. */
+  active = false;
+  filter: WalkFilter = 'notObserved';
+  /** The claims of `filter`, in the drawn order, and the walk's place among them. */
+  list: Claim[] = [];
+  position = -1;
+  /** The current claim's quote the editor is asked for. */
+  quote = 0;
+  status: WalkOpenStatus = { state: 'none', quote: 0, quotes: 0 };
+
+  private app: App;
+  private order: Claim[] = [];
+  private orderIndex: GraphIndex | null = null;
+  /** Every numbered open of this page; the host drops one that is not above the last it saw. */
+  private seq = 0;
+  /** The `seq` of the walk's latest open: only its answer is shown. */
+  private latestSeq = 0;
+  private timer: ReturnType | null = null;
+  /** The place the walk resumes from, for `revision` (kept after the walk ends). */
+  private remembered: { revision: string; state: WalkViewState } | null = null;
+  /** A remount's saved place, applied by the first document of the revision it was saved for. */
+  private restored: { revision: string; state: WalkViewState } | null = null;
+  /** While the walk itself selects, the App's selection hook must not treat it as the reader's move. */
+  selecting = false;
+
+  constructor(app: App) {
+    this.app = app;
+  }
+
+  /* ── the claims ────────────────────────────────────────────────────── */
+
+  private index(): GraphIndex | null {
+    return this.app.index;
+  }
+
+  /** The drawn order for the current document, computed once per index. */
+  claims(): Claim[] {
+    const index = this.index();
+    if (!index) return [];
+    if (index !== this.orderIndex) {
+      this.order = claimOrder(index);
+      this.orderIndex = index;
+    }
+    return this.order;
+  }
+
+  private isStale = (file: string): boolean => !!this.app.freshness.reasonOf(file);
+
+  changedOffered(): boolean {
+    return changedOffered(this.app.freshness.list().map((file) => file.reason));
+  }
+
+  counts(): Record {
+    const index = this.index();
+    if (!index) return { notObserved: 0, findings: 0, changed: 0, all: 0 };
+    return filterCounts(this.claims(), index, this.isStale);
+  }
+
+  offered(): WalkFilter[] {
+    return offeredFilters(this.counts(), this.changedOffered());
+  }
+
+  private listFor(filter: WalkFilter): Claim[] {
+    const index = this.index();
+    return index ? filterClaims(this.claims(), filter, index, this.isStale) : [];
+  }
+
+  /** The claim the walk is on, or null. */
+  current(): Claim | null {
+    return this.position >= 0 && this.position < this.list.length ? this.list[this.position] : null;
+  }
+
+  private currentLocs(): Loc[] {
+    const index = this.index();
+    const claim = this.current();
+    return index && claim ? claimLocs(index, claim) : [];
+  }
+
+  /* ── starting, stepping, ending ────────────────────────────────────── */
+
+  /**
+   * Start the walk, or carry on with it (`r`, Review, the ⋯ menu; `u` asks for Not observed and the
+   * stale notice for Changed files). Without a filter it resumes the place remembered for this
+   * revision, else starts on Not observed (All when no claim is marked inferred or unresolved).
+   * A filter asked for that holds no claim is said, and nothing starts. True when it runs.
+   */
+  start(filter?: WalkFilter): boolean {
+    const index = this.index();
+    if (!index) return false;
+    const offered = this.offered();
+    const saved = this.remembered && this.remembered.revision === this.app.workflowRevision ? this.remembered.state : null;
+    let next: WalkFilter;
+    if (filter) {
+      if (offered.indexOf(filter) < 0) {
+        this.app.announce(filter === 'notObserved'
+          ? 'No claim is marked inferred or unresolved in this revision.'
+          : filter === 'changed' ? 'No claim cites a file that changed or went missing.' : 'No claims to walk with that filter.');
+        return false;
+      }
+      next = filter;
+    } else {
+      next = saved && offered.indexOf(saved.filter) >= 0 ? saved.filter : offered.indexOf('notObserved') >= 0 ? 'notObserved' : 'all';
+    }
+    const list = this.listFor(next);
+    if (!list.length) {
+      this.app.announce('This revision has no claims to walk.');
+      return false;
+    }
+    const wasActive = this.active;
+    // The walk reads each claim in the Selection pane: a docked rail the reader hid is shown again.
+    if (!wasActive) this.app.openRailForWalk();
+    this.filter = next;
+    this.list = list;
+    const anchor = saved ? saved.claim : null;
+    this.position = Math.max(0, positionFor(list, anchor, this.claims()));
+    this.quote = saved && sameClaim(saved.claim, this.current()) ? Math.min(saved.quote || 0, Math.max(0, this.currentLocs().length - 1)) : 0;
+    this.active = true;
+    if (!wasActive) this.app.onWalkShown(true);
+    this.show(true);
+    return true;
+  }
+
+  /** End the walk (Escape, Exit, Review again). Its place is kept for this revision. */
+  stop(announce = true): boolean {
+    if (!this.active) return false;
+    this.active = false;
+    this.cancelTimer();
+    this.app.bridge.post({ v: 1, type: 'walk', state: 'end' });
+    this.remember();
+    this.app.onWalkShown(false);
+    if (announce) this.app.announce('Review ended. r resumes it here.');
+    this.app.saveSoon();
+    return true;
+  }
+
+  toggle(): void {
+    if (this.active) this.stop();
+    else this.start();
+  }
+
+  /** j / k, ↓ / ↑: the next or previous claim. At either end the walk stays and says so. */
+  step(delta: number): boolean {
+    if (!this.active || !this.list.length) return false;
+    const next = Math.max(0, Math.min(this.list.length - 1, this.position + delta));
+    if (next === this.position) {
+      this.app.announce(delta > 0
+        ? 'Claim ' + this.list.length + ' of ' + this.list.length + ' is the last one.'
+        : 'Claim 1 of ' + this.list.length + ' is the first one.');
+      return true;
+    }
+    this.position = next;
+    this.quote = 0;
+    this.show(true);
+    return true;
+  }
+
+  /** [ and ]: the current claim's previous or next quote, opened beside the panel. */
+  stepQuote(delta: number): boolean {
+    if (!this.active) return false;
+    const locs = this.currentLocs();
+    if (locs.length < 2) {
+      this.app.announce(locs.length ? 'This claim has one quote.' : 'This claim cites no lines.');
+      return true;
+    }
+    const next = Math.max(0, Math.min(locs.length - 1, this.quote + delta));
+    if (next === this.quote) {
+      this.app.announce(delta > 0 ? 'Quote ' + locs.length + ' of ' + locs.length + ' is the last one.' : 'Quote 1 of ' + locs.length + ' is the first one.');
+      return true;
+    }
+    this.quote = next;
+    this.app.announce('Quote ' + (next + 1) + ' of ' + locs.length + ': ' + walkLocText(locs[next]) + '.');
+    this.scheduleOpen();
+    this.remember();
+    // The pane brings the marked quote into view (live: a second quote sat below the fold).
+    this.render(true);
+    this.app.saveSoon();
+    return true;
+  }
+
+  /**
+   * `u` / `U` (not observed) and, while walking, `n` / `p` (findings): the next or previous claim of
+   * that kind after the current one in the drawn order, wrapping as `n` and `p` always have. The
+   * filter stays when it holds that claim; otherwise it becomes Not observed or Findings. `u`
+   * starts the walk when it is not running.
+   */
+  jump(kind: 'notObserved' | 'findings', backwards: boolean): boolean {
+    const index = this.index();
+    if (!index) return false;
+    const filter: WalkFilter = kind;
+    if (!this.active) return this.start(filter);
+    const order = this.claims();
+    const matches = (claim: Claim): boolean => (kind === 'findings' ? claim.kind === 'issue' : isNotObserved(claimBasis(index, claim)));
+    const here = order.findIndex((claim) => sameClaim(claim, this.current()));
+    let target: Claim | null = null;
+    for (let step = 1; step <= order.length; step++) {
+      const at = ((here < 0 ? (backwards ? 0 : -1) : here) + (backwards ? -step : step) + order.length * 2) % order.length;
+      if (matches(order[at])) {
+        target = order[at];
+        break;
+      }
+    }
+    if (!target) {
+      this.app.announce(kind === 'findings' ? 'This revision has no findings.' : 'No claim is marked inferred or unresolved in this revision.');
+      return true;
+    }
+    if (!this.list.some((claim) => sameClaim(claim, target))) {
+      this.filter = filter;
+      this.list = this.listFor(filter);
+    }
+    this.position = Math.max(0, this.list.findIndex((claim) => sameClaim(claim, target)));
+    this.quote = 0;
+    this.show(true);
+    return true;
+  }
+
+  /** A filter chosen in the bar. The walk keeps its claim when the new filter holds it. */
+  setFilter(filter: WalkFilter): void {
+    if (!this.active || this.offered().indexOf(filter) < 0) return;
+    const before = this.current();
+    this.filter = filter;
+    this.list = this.listFor(filter);
+    this.position = Math.max(0, positionFor(this.list, before, this.claims()));
+    const same = sameClaim(before, this.current());
+    if (!same) this.quote = 0;
+    this.show(!same);
+    this.app.announce(FILTER_LABEL[filter] + ': ' + this.list.length + (this.list.length === 1 ? ' claim. ' : ' claims. ') + this.announcement());
+  }
+
+  /** Enter (and an Open link of the current claim): open the current quote again, now. */
+  reopen(focusEditor: boolean): boolean {
+    if (!this.active || !this.current()) return false;
+    this.cancelTimer();
+    this.sendOpen(focusEditor);
+    return true;
+  }
+
+  /**
+   * An Open link in the Selection pane while the walk shows that claim: the walk opens it as its
+   * own quote (no notification when it is blocked; the reason goes to the bar and the pane).
+   */
+  openQuote(loc: Loc, focusEditor: boolean): boolean {
+    if (!this.active || !loc.evidenceId) return false;
+    const at = this.currentLocs().findIndex((item) => item.evidenceId === loc.evidenceId);
+    if (at < 0) return false;
+    this.quote = at;
+    this.cancelTimer();
+    this.sendOpen(focusEditor);
+    this.remember();
+    return true;
+  }
+
+  /**
+   * The reader selected something else (a click, an arrow, a search hit, a link) while walking.
+   * When the walk's list holds it, the walk follows: its place moves there, nothing is opened (a
+   * click selects only; Enter opens), and any highlight of the claim it left is cleared.
+   */
+  followSelection(sel: Sel | null): void {
+    if (!this.active || this.selecting || !sel) return;
+    const at = this.list.findIndex((claim) => sameClaim(claim, sel));
+    if (at < 0 || at === this.position) return;
+    this.position = at;
+    this.quote = 0;
+    this.cancelTimer();
+    this.app.bridge.post({ v: 1, type: 'walk', state: 'clear' });
+    this.status = this.statusFor('idle');
+    this.remember();
+    this.render();
+  }
+
+  /* ── host answers and document changes ─────────────────────────────── */
+
+  /** A new document (`setWorkflow`). Another revision ends the walk and starts fresh. */
+  onDocument(revisionChanged: boolean): void {
+    const revision = this.app.workflowRevision;
+    if (revisionChanged) {
+      if (this.active) this.stop(false);
+      this.remembered = null;
+      this.list = [];
+      this.position = -1;
+    }
+    // A remount brings the saved place back for the revision it was saved with.
+    const restored = this.restored;
+    this.restored = null;
+    if (restored && restored.revision === revision && !this.remembered) {
+      this.remembered = { revision, state: restored.state };
+      if (restored.state.active) this.resume();
+      return;
+    }
+    if (!this.active) return;
+    // The same revision again (a refresh): the claims are the same; keep the place.
+    const before = this.current();
+    this.list = this.listFor(this.filter);
+    this.position = Math.max(0, positionFor(this.list, before, this.claims()));
+    this.render();
+  }
+
+  /**
+   * A remounted page brings back a walk that was running: the bar and the selection, without
+   * asking the host to open anything (it still shows the last open); Enter opens it again.
+   */
+  private resume(): void {
+    const saved = this.remembered ? this.remembered.state : null;
+    if (!saved) return;
+    const offered = this.offered();
+    this.filter = offered.indexOf(saved.filter) >= 0 ? saved.filter : 'all';
+    this.list = this.listFor(this.filter);
+    if (!this.list.length) return;
+    this.position = Math.max(0, positionFor(this.list, saved.claim, this.claims()));
+    this.quote = sameClaim(saved.claim, this.current()) ? Math.min(saved.quote || 0, Math.max(0, this.currentLocs().length - 1)) : 0;
+    this.active = true;
+    this.app.onWalkShown(true);
+    this.show(false);
+  }
+
+  /** The host's stale files changed: the Changed files filter follows; the walk keeps its claim. */
+  onStale(): void {
+    if (!this.active) return;
+    if (this.offered().indexOf(this.filter) < 0) this.filter = 'all';
+    const before = this.current();
+    this.list = this.listFor(this.filter);
+    this.position = Math.max(0, positionFor(this.list, before, this.claims()));
+    this.render();
+  }
+
+  private onResult(result: ActionResult, seq: number): void {
+    if (!this.active || seq !== this.latestSeq || result.outcome === 'cancelled') return;
+    if (result.outcome === 'done') this.status = this.statusFor('done');
+    else {
+      const message = result.message || (result.outcome === 'blocked' ? 'Not opened.' : 'VS Code could not show the file.');
+      this.status = this.statusFor(result.outcome, message);
+      this.app.announce((result.outcome === 'blocked' ? 'Not opened: ' : 'Failed: ') + message);
+    }
+    this.render();
+  }
+
+  /* ── opening ───────────────────────────────────────────────────────── */
+
+  private cancelTimer(): void {
+    if (this.timer !== null) clearTimeout(this.timer);
+    this.timer = null;
+  }
+
+  private statusFor(state: WalkOpenStatus['state'], message?: string): WalkOpenStatus {
+    const locs = this.currentLocs();
+    const quote = Math.min(this.quote, Math.max(0, locs.length - 1));
+    const out: WalkOpenStatus = { state, quote, quotes: locs.length };
+    if (locs[quote] && state !== 'none' && state !== 'unavailable') out.loc = locs[quote];
+    if (message) out.message = message;
+    return out;
+  }
+
+  /**
+   * The viewer's own reason for a quote whose file the host already reported stale, shown at once;
+   * the host's answer (it never opens such a file) replaces it when it comes.
+   */
+  private localBlock(loc: Loc): string | null {
+    const reason = loc.evidenceId ? this.app.freshness.reasonOf(loc.file) : undefined;
+    if (!reason) return null;
+    return loc.file + ': ' + STALE_TEXT[reason] + '; not opened.';
+  }
+
+  /** After the pause, ask the host for the current quote (or, with none, to clear the highlight). */
+  private scheduleOpen(): void {
+    this.cancelTimer();
+    const locs = this.currentLocs();
+    const loc = locs[Math.min(this.quote, locs.length - 1)];
+    if (!locs.length || !loc) this.status = this.statusFor('none');
+    else if (!this.app.caps.canOpenSource) this.status = this.statusFor('unavailable');
+    else {
+      const local = this.localBlock(loc);
+      this.status = local ? this.statusFor('blocked', local) : this.statusFor('opening');
+    }
+    if (this.status.state === 'unavailable') return;
+    this.timer = setTimeout(() => {
+      this.timer = null;
+      this.sendOpen(false);
+    }, WALK_OPEN_DEBOUNCE_MS);
+  }
+
+  /** Waiting to ask the host (tests flush it instead of sleeping). */
+  get pendingOpen(): boolean {
+    return this.timer !== null;
+  }
+
+  /** Send the pending open now (Enter does; a test may). */
+  flushOpen(): void {
+    if (this.timer === null) return;
+    this.cancelTimer();
+    this.sendOpen(false);
+  }
+
+  private sendOpen(focusEditor: boolean): void {
+    if (!this.active) return;
+    const locs = this.currentLocs();
+    const loc = locs[Math.min(this.quote, locs.length - 1)];
+    if (!loc) {
+      this.app.bridge.post({ v: 1, type: 'walk', state: 'clear' });
+      this.status = this.statusFor('none');
+      this.render();
+      return;
+    }
+    if (!this.app.caps.canOpenSource) {
+      this.status = this.statusFor('unavailable');
+      this.render();
+      return;
+    }
+    const seq = ++this.seq;
+    this.latestSeq = seq;
+    // VS Code may tear down a hidden webview when the active editor changes: save first, as every
+    // open does (app/actions.ts).
+    this.remember();
+    this.app.bridge.saveState(this.app.getState());
+    const frame = locationFrame(loc);
+    frame.walk = true;
+    frame.seq = seq;
+    if (focusEditor) frame.focus = true;
+    this.app.postRequest(frame, (result) => this.onResult(result, seq));
+    const local = this.localBlock(loc);
+    this.status = local ? this.statusFor('blocked', local) : this.statusFor('opening');
+    this.render();
+  }
+
+  /* ── showing ───────────────────────────────────────────────────────── */
+
+  /** Select and reveal the current claim, announce it, and (`open`) schedule its open. */
+  private show(open: boolean): void {
+    const claim = this.current();
+    if (!claim) return;
+    this.selecting = true;
+    try {
+      this.app.showWalkClaim(claim);
+    } finally {
+      this.selecting = false;
+    }
+    if (open) this.scheduleOpen();
+    else this.status = this.statusFor(this.currentLocs().length ? (this.app.caps.canOpenSource ? 'idle' : 'unavailable') : 'none');
+    this.remember();
+    this.render();
+    this.app.announce(this.announcement());
+    this.app.saveSoon();
+  }
+
+  private announcement(): string {
+    const index = this.index();
+    const claim = this.current();
+    return index && claim ? walkAnnouncement(this.position, this.list.length, this.filter, index, claim) : '';
+  }
+
+  /** Repaint the bar, the header's Review state and the pane's quote mark (`reveal`: scroll to it). */
+  render(reveal = false): void {
+    this.app.renderWalkBar();
+    applyWalkMark(this.app.rail.root, this.paneMark(), reveal);
+  }
+
+  /** The Selection pane's mark for the walk's quote, while the pane shows the walk's claim. */
+  paneMark(): { quote: number; status: WalkOpenStatus } | null {
+    if (!this.active) return null;
+    const claim = this.current();
+    if (!claim || !sameClaim(claim, this.app.selection)) return null;
+    return { quote: this.status.quote, status: this.status };
+  }
+
+  /* ── saved place ───────────────────────────────────────────────────── */
+
+  private remember(): void {
+    const revision = this.app.workflowRevision;
+    const claim = this.current();
+    if (!revision || !claim) return;
+    const state: WalkViewState = { filter: this.filter, claim: { kind: claim.kind, id: claim.id } };
+    if (this.quote > 0) state.quote = this.quote;
+    if (this.active) state.active = true;
+    this.remembered = { revision, state };
+  }
+
+  /** `ViewState.walk`: the place for the displayed revision, or undefined before the first walk. */
+  viewState(): WalkViewState | undefined {
+    const revision = this.app.workflowRevision;
+    if (!this.remembered || !revision || this.remembered.revision !== revision) return undefined;
+    const state: WalkViewState = { ...this.remembered.state, claim: { ...this.remembered.state.claim } };
+    if (this.active) state.active = true;
+    else delete state.active;
+    return state;
+  }
+
+  /** A remount's saved walk, for the revision it was saved with (applied by `onDocument`). */
+  restore(revision: string, value: unknown): void {
+    const state = sanitizeWalk(value);
+    this.restored = state ? { revision, state } : null;
+  }
+
+  destroy(): void {
+    this.cancelTimer();
+  }
+}
diff --git a/webview/src/canvasview.ts b/webview/src/canvasview.ts
index 39f38b58..51ddcc66 100644
--- a/webview/src/canvasview.ts
+++ b/webview/src/canvasview.ts
@@ -686,6 +686,23 @@ export class CanvasView {
     else if (!this.viewport.isVisible(union)) this.viewport.centerOn(union);
   }
 
+  /**
+   * Viewer M3, a step of the review walk: below the detail threshold, zoom to reading size on the
+   * step or the connection's two ends (`revealNode`, `revealEdge`); at reading size, pan the least
+   * distance that shows it whole (`revealRect`), so stepping through neighbours does not swing the
+   * picture to centre every card. The visible area is the canvas above the bottom sheet.
+   */
+  revealTarget(target: { kind: 'node' | 'edge'; id: string }): void {
+    const rect = this.targetRect(target);
+    if (!rect) return;
+    if (this.viewport.vp.zoom < LOD_FULL_ZOOM) {
+      if (target.kind === 'node') this.revealNode(target.id, false);
+      else this.revealEdge(target.id);
+      return;
+    }
+    if (!this.viewport.isVisible(rect)) this.viewport.revealRect(rect);
+  }
+
   /** The laid-out rect of a node's visible card, or of both ends of a connection. */
   private targetRect(target: { kind: 'node' | 'edge'; id: string }): { x: number; y: number; w: number; h: number } | null {
     if (!this.index || !this.frameData) return null;
diff --git a/webview/src/icons.ts b/webview/src/icons.ts
index 83a22046..6d771659 100644
--- a/webview/src/icons.ts
+++ b/webview/src/icons.ts
@@ -189,6 +189,8 @@ const UI_PATHS: Record = {
   minimap: 'M2.4 3.6h11.2v8.8H2.4ZM8.4 7.4h4.4v4.4H8.4Z',
   /** VIEW-07: a picture in a frame — "export the diagram". */
   image: 'M2.4 3.4h11.2v9.2H2.4ZM2.4 10.6 5.8 7.4l2.4 2.2 2.2-2 3.2 3M10.3 5.3a1.05 1.05 0 1 0 0 2.1 1.05 1.05 0 0 0 0-2.1Z',
+  /** Viewer M3: the review walk: a pointer at the first of three rows. */
+  review: 'M2.4 3.2 4.8 5.4 2.4 7.6M7.2 5.4h6.4M7.2 9.4h6.4M2.6 13h11',
   /** The shortcut sheet: a keyboard. */
   keyboard: 'M1.8 4.2h12.4v7.6H1.8ZM4.2 6.6h.1M6.7 6.6h.1M9.2 6.6h.1M11.7 6.6h.1M4.8 9.4h6.4',
 };
diff --git a/webview/src/styles/export.css b/webview/src/styles/export.css
index 635a16d0..4f915523 100644
--- a/webview/src/styles/export.css
+++ b/webview/src/styles/export.css
@@ -23,6 +23,7 @@
   .mlv-header,
   .mlv-workflow,
   .mlv-hostnotice,
+  .mlv-walkbar,
   .mlv-status,
   .mlv-rail,
   .mlv-minimap,
diff --git a/webview/src/styles/workflow.css b/webview/src/styles/workflow.css
index b249db97..852dd460 100644
--- a/webview/src/styles/workflow.css
+++ b/webview/src/styles/workflow.css
@@ -163,3 +163,141 @@
 .mlv-minimap.is-narrow {
   display: none;
 }
+
+/*
+ * Viewer M3: the review walk's bar, a band at the foot of the diagram column, shown only while the
+ * walk runs: directly above the bottom sheet's tabs, or with the side panel (1260 px and wider)
+ * along the bottom of the diagram. It is after the canvas in the document, so the canvas stays
+ * within four Tab presses of the top and Tab goes canvas, walk controls, sheet. Wide: the place and the filters, the key hint and Exit on one
+ * row, the editor line under them. Narrow (data-layout="narrow", under 620 px): "3/16", the filters
+ * and Exit on one row; the row may wrap below about 400 px rather than scroll sideways. Plain text
+ * colours; colour only marks a quote the host did not open. No motion.
+ */
+.mlv-walkbar {
+  flex: none;
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  padding: 4px var(--mlv-s4) 5px var(--mlv-s5);
+  border-top: 1px solid var(--mlv-border);
+  background: var(--mlv-surface-2);
+  color: var(--mlv-text);
+  font-size: var(--mlv-fs-12);
+  line-height: 1.4;
+}
+.mlv-walkbar[hidden] { display: none; }
+.mlv-walkbar__row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--mlv-s2) var(--mlv-s4);
+  min-width: 0;
+}
+.mlv-walkbar__pos {
+  display: inline-flex;
+  flex: none;
+  align-items: center;
+  gap: 4px;
+  margin: 0;
+  font-weight: var(--mlv-fw-semi);
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+.mlv-walkbar__mark { display: inline-flex; color: var(--mlv-stale-ink); }
+.mlv-walkbar__mark[hidden] { display: none; }
+.mlv-walkbar__tools {
+  display: flex;
+  flex: 1 1 auto;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--mlv-s2) var(--mlv-s4);
+  min-width: 0;
+}
+.mlv-walkbar__filters { display: inline-flex; flex-wrap: wrap; gap: var(--mlv-s2); }
+.mlv-walkbar__filter {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  height: 22px;
+  padding: 0 var(--mlv-s3);
+  border: 1px solid var(--mlv-border);
+  border-radius: var(--mlv-r-chip);
+  background: var(--mlv-surface);
+  color: var(--mlv-text);
+  font-size: var(--mlv-fs-12);
+  white-space: nowrap;
+  cursor: pointer;
+}
+.mlv-walkbar__filter[hidden] { display: none; }
+.mlv-walkbar__filter:hover { border-color: var(--mlv-border-strong); }
+/* The chosen filter: a stronger border and weight, not colour alone. */
+.mlv-walkbar__filter[aria-pressed="true"] {
+  border-color: var(--mlv-text-2);
+  font-weight: var(--mlv-fw-semi);
+}
+.mlv-walkbar__fcount { color: var(--mlv-text-2); font-variant-numeric: tabular-nums; }
+.mlv-walkbar__filter[aria-pressed="true"] .mlv-walkbar__fcount { color: var(--mlv-text); }
+.mlv-walkbar__keys {
+  display: inline-flex;
+  flex-wrap: wrap;
+  gap: var(--mlv-s2) var(--mlv-s4);
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-11);
+}
+.mlv-walkbar__keys[hidden] { display: none; }
+.mlv-walkbar__key { display: inline-flex; align-items: center; gap: 2px; white-space: nowrap; }
+.mlv-walkbar__exit { margin-left: auto; min-height: 22px; padding: 0 var(--mlv-s3); }
+.mlv-walkbar__editor {
+  display: flex;
+  align-items: flex-start;
+  gap: 5px;
+  margin: 0;
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-11);
+  overflow-wrap: anywhere;
+}
+.mlv-walkbar__editor[hidden] { display: none; }
+.mlv-walkbar__editor[data-walk-status="blocked"],
+.mlv-walkbar__editor[data-walk-status="failed"] { color: var(--mlv-text); }
+.mlv-walkbar__editoricon { display: inline-flex; flex: none; padding-top: 1px; color: var(--mlv-stale-ink); }
+.mlv-walkbar__editoricon[hidden] { display: none; }
+.mlv-walkbar[data-layout="narrow"] { padding: 3px var(--mlv-s3); }
+.mlv-walkbar[data-layout="narrow"] .mlv-walkbar__exitlabel {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  overflow: hidden;
+  clip: rect(0 0 0 0);
+}
+
+/* The header's Review button: an icon and a word; pressed while the walk runs. */
+.mlv-header__review {
+  flex: none;
+  height: 24px;
+  min-height: 0;
+  padding: 0 var(--mlv-s3);
+  gap: 5px;
+}
+.mlv-header__review[aria-pressed="true"] { border-color: var(--mlv-text-2); }
+
+/*
+ * The walk's quote in the Selection pane: a focus-coloured left rule (the line the editor beside
+ * is asked for) and one line under its head saying what the editor shows, or why nothing was
+ * opened. Not colour alone: the line says it in words.
+ */
+.mlv-quote.is-walk {
+  margin-left: calc(-1 * var(--mlv-s3));
+  padding-left: calc(var(--mlv-s3) - 2px);
+  border-left: 2px solid var(--mlv-focus);
+}
+.mlv-quote__walk {
+  display: flex;
+  align-items: flex-start;
+  gap: 5px;
+  margin: 3px 0 0 calc(1.4em + var(--mlv-s3));
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-11);
+}
+.mlv-quote.is-walk[data-walk-status="blocked"] .mlv-quote__walk,
+.mlv-quote.is-walk[data-walk-status="failed"] .mlv-quote__walk { color: var(--mlv-text); }
+.mlv-quote__walk .mlv-uicon { flex: none; margin-top: 1px; color: var(--mlv-stale-ink); }
diff --git a/webview/src/types.ts b/webview/src/types.ts
index bf07668b..807a98df 100644
--- a/webview/src/types.ts
+++ b/webview/src/types.ts
@@ -257,6 +257,23 @@ export interface ViewState {
    * `railTab` and, since the same fix, `selection`.
    */
   sheetOpen?: boolean;
+  /**
+   * Viewer M3: the review walk's place for `workflowRevision`: its filter, the claim it is on, the
+   * quote of that claim, and whether it was running. Absent until the walk has been started, and
+   * restored on a remount only when `workflowRevision` matches; another revision starts fresh. It
+   * records no verdict and no "checked" mark, only the position.
+   */
+  walk?: WalkViewState;
+}
+
+/** Viewer M3: the review walk's saved place (`ViewState.walk`). */
+export interface WalkViewState {
+  filter: 'notObserved' | 'findings' | 'changed' | 'all';
+  claim: Sel;
+  /** The claim's quote (0-based) the walk last showed; absent at 0. */
+  quote?: number;
+  /** The walk was running; absent when it was not. */
+  active?: boolean;
 }
 
 /** A Refine composer's reader-visible state. */
@@ -365,8 +382,13 @@ export type UiToHost =
    * instead); `highlight: false` selects the range without the whole-range decoration.
    */
   | { v: 1; type: 'openLocation'; file: string; absFile: string; line: number; col: number; endLine: number; endCol: number; preview?: boolean; evidenceId?: string; cell?: number; focus?: boolean; seq?: number; requestId?: string; walk?: boolean; highlight?: boolean }
-  /** Viewer M3: the review walk ended; the host clears the cited-range highlight and drops a walk open still on its way. */
-  | { v: 1; type: 'walk'; state: 'end' }
+  /**
+   * Viewer M3: the review walk ended (`end`), or it moved to a claim it opens nothing for (`clear`:
+   * a claim with no quote, or one it only selected). Either way the host clears the cited-range
+   * highlight and drops a walk open still on its way, so the editor never shows an earlier claim's
+   * lines as if they were this one's.
+   */
+  | { v: 1; type: 'walk'; state: 'end' | 'clear' }
   /** Viewer M1: the workspace-root hint's two actions. The host owns the folder. */
   | { v: 1; type: 'workspaceHint'; action: 'add' | 'open' }
   /**
diff --git a/webview/src/ui/appkeys.ts b/webview/src/ui/appkeys.ts
index 9059acea..0a64441e 100644
--- a/webview/src/ui/appkeys.ts
+++ b/webview/src/ui/appkeys.ts
@@ -9,7 +9,8 @@
  * nothing else calls them:
  *
  *  - THE Escape cascade, in this exact order — shortcut sheet -> the Refine…
- *    popover -> legend -> the open bottom panel (viewer M2) -> focus mode -> selection -> blur.
+ *    popover -> legend -> the review walk (viewer M3) -> the open bottom panel (viewer M2) ->
+ *    focus mode -> selection -> blur.
  *    One owner writes that order ONCE
  *    (CONTRACTS v1.1 §10.1, which is where v1.0 §11.13 now lives); whichever
  *    rung fires also stops the flow it owned.
@@ -56,6 +57,14 @@ export interface KeyContext {
   /** Viewer M2: collapse the open bottom panel to its tab strip; false when there is none. */
   collapseSheet(): boolean;
   announce(text: string): void;
+  /** Viewer M3: the review walk. */
+  walking(): boolean;
+  /** End the walk; false when it was not running. */
+  endWalk(): boolean;
+  review(): void;
+  walkStep(delta: number): boolean;
+  walkQuote(delta: number): boolean;
+  walkJump(kind: 'notObserved' | 'findings', backwards: boolean): boolean;
 }
 
 export function commandPortFor(ctx: KeyContext): CommandPort {
@@ -71,6 +80,10 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
       // above focus mode because it is the shallower thing on screen: dismissing
       // it must never also throw away the focus or selection underneath.
       else if (ctx.legendOpen()) ctx.closeLegend();
+      // Viewer M3: the review walk ends before anything it opened is closed: the claim it was on
+      // stays selected and the bottom panel stays open on it. One Escape ends it, whatever else is
+      // on screen below it, so it never takes two presses to leave the walk.
+      else if (ctx.endWalk()) return true;
       // Viewer M2: the open bottom panel collapses to its tab strip before anything on the canvas
       // is undone: the selection it shows stays selected.
       else if (ctx.collapseSheet()) return true;
@@ -131,6 +144,13 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
     toggleShortcuts: () => ctx.toggleShortcuts(),
 
     cycleConnections: (backwards) => cycleConnections(ctx, backwards),
+
+    walking: () => ctx.walking(),
+    review: () => ctx.review(),
+    walkStep: (delta) => ctx.walkStep(delta),
+    walkQuote: (delta) => ctx.walkQuote(delta),
+    walkNotObserved: (backwards) => ctx.walkJump('notObserved', backwards),
+    walkFindings: (backwards) => ctx.walkJump('findings', backwards),
   };
 }
 
diff --git a/webview/src/ui/chrome.ts b/webview/src/ui/chrome.ts
index ca6a4ffe..73afa03e 100644
--- a/webview/src/ui/chrome.ts
+++ b/webview/src/ui/chrome.ts
@@ -5,7 +5,7 @@
  * and the authored header. In order:
  *
  *   title · provenance chip (host · revision) · search · severity toggles · "N not observed" ·
- *   ... menu · Refine…
+ *   Review (viewer M3) · ... menu · Refine…
  *
  * The row never wraps. How much of it shows depends on the panel's width (`headerLayout`):
  *
@@ -21,10 +21,10 @@
  * Viewer M2 review (M2R-2, A11Y-8): how wide the controls are depends on the document (two-digit
  * counts, three severities) and on whether the search field is open, so the layout alone could
  * not keep Refine… inside the panel. After every change `fitRow` measures the row and, while it
- * overflows, folds in this order: the revision chip (About stays in the ... menu), the "not
- * observed" toggle (into the ... menu, with its count and units), then the title (kept for screen
- * readers) and, only while the search field is open at mid or narrow widths, the severity toggles
- * (back when it closes). The roving tab stop is re-derived after each fold. A layout engine is
+ * overflows, folds in this order: the revision chip and, since viewer M3, the Review button (About
+ * and Review stay in the ... menu, and `r` starts the walk), the "not observed" toggle (into the
+ * ... menu, with its count and units), then the title (kept for screen readers) and, only while
+ * the search field is open at mid or narrow widths, the severity toggles (back when it closes). The roving tab stop is re-derived after each fold. A layout engine is
  * needed to measure; jsdom folds nothing.
  *
  * The status bar (about 22 px) carries the step and connection counts, the coverage status with the
@@ -82,6 +82,8 @@ export interface ChromeCallbacks {
   onShortcuts(): void;
   /** The ... menu is opening: repaint, so its checkboxes and disabled items are current. */
   onMenuOpen(): void;
+  /** Viewer M3: the Review button or the ... menu's item: start the review walk, or end it. */
+  onReview(): void;
 }
 
 export interface ChromeState {
@@ -106,6 +108,8 @@ export interface ChromeState {
   exceptionsOn: boolean;
   /** Viewer M2: the rail is docked beside the canvas or a bottom sheet under it (the menu names it). */
   railMode: 'docked' | 'sheet';
+  /** Viewer M3: the review walk is running (Review is pressed). */
+  walking: boolean;
 }
 
 /** Viewer M2: inferred or unresolved claims, counted by what they are. */
@@ -137,8 +141,9 @@ export function coverageText(document: WorkflowDocument): string {
 }
 
 /**
- * How far `fitRow` may fold the row: the revision chip, then "not observed", then the title; and,
- * only while the search field is open, the severity toggles (they come back when it closes).
+ * How far `fitRow` may fold the row: the revision chip and the Review button (viewer M3), then "not
+ * observed", then the title; and, only while the search field is open, the severity toggles (they
+ * come back when it closes).
  */
 export const HEADER_FIT_MAX = 4;
 
@@ -172,6 +177,8 @@ export class Chrome {
   /** The word after the severity toggles, "findings": the unit their numbers count. */
   private sevUnit: HTMLElement;
   private exceptionsBtn: HTMLButtonElement;
+  /** Viewer M3: starts or ends the review walk; folds with the revision chip. */
+  private reviewBtn: HTMLButtonElement;
   private counts: HTMLElement;
   private coverage: HTMLButtonElement;
   private fresh: HTMLElement;
@@ -279,6 +286,18 @@ export class Chrome {
     on(this.exceptionsBtn, 'click', () => cb.onToggleExceptions(this.exceptionsBtn.getAttribute('aria-pressed') !== 'true'));
     this.toolbar.appendChild(this.exceptionsBtn);
 
+    // Viewer M3: the review walk. A toggle: pressed while the walk runs. Like the revision chip it
+    // is left out below 620 px and folds first when the row is short (the ... menu always has it,
+    // and `r` starts it anywhere).
+    this.reviewBtn = el('button', 'mlv-btn mlv-header__review') as HTMLButtonElement;
+    this.reviewBtn.type = 'button';
+    this.reviewBtn.setAttribute('aria-pressed', 'false');
+    this.reviewBtn.appendChild(uiIcon('review', 14));
+    add(this.reviewBtn, el('span', 'mlv-header__reviewlabel', 'Review'));
+    this.reviewBtn.hidden = true;
+    on(this.reviewBtn, 'click', () => cb.onReview());
+    this.toolbar.appendChild(this.reviewBtn);
+
     this.more = new MoreMenu((id, byKeyboard) => this.pick(id, byKeyboard), () => cb.onMenuOpen());
     this.toolbar.appendChild(this.more.button);
 
@@ -371,13 +390,16 @@ export class Chrome {
    * Viewer M2 review (M2R-1): the `hidden` attribute on every control the current shape leaves
    * out, so the roving tab stop, the ... menu and a test agree with what the stylesheet draws. The
    * revision chip: no document, below 620 px, or folded. The search icon: only at `mid` with the
-   * field closed. "Not observed": nothing to count, or folded.
+   * field closed. "Not observed": nothing to count, or folded. Viewer M3: Review goes with the
+   * revision chip (below 620 px, or folded), so the 541 px row keeps the M2 controls; the ... menu
+   * always has it.
    */
   private syncControls(): void {
     this.provenance.hidden = !this.hasDocument || this.layout === 'narrow' || this.fitLevel >= 1;
     const searchFolded = (this.layout === 'mid' || this.layout === 'narrow') && this.header.getAttribute('data-search') !== 'open';
     this.searchBtn.hidden = !(this.layout === 'mid' && searchFolded);
     this.exceptionsBtn.hidden = !this.hasExceptions || this.fitLevel >= 2;
+    this.reviewBtn.hidden = !this.hasDocument || this.layout === 'narrow' || this.fitLevel >= 1;
     for (const [sev, b] of this.sevButtons) b.hidden = !this.sevShown.has(sev) || this.fitLevel >= 4;
     this.sevUnit.hidden = this.sevShown.size === 0 || this.fitLevel >= 4;
     this.header.setAttribute('data-fit', String(this.fitLevel));
@@ -425,6 +447,7 @@ export class Chrome {
       minimapShown: !s.minimapCollapsed,
       minimapUnavailable: s.minimapUnavailable,
       railOpen: s.railOpen,
+      walking: s.walking,
       railMode: s.railMode,
       hasSelection: s.hasSelection,
       canExport: !!s.graph,
@@ -443,6 +466,7 @@ export class Chrome {
     else if (id === 'fit') cb.onFitWhole();
     else if (id === 'zoomsel') cb.onZoomToSelection();
     else if (id === 'shortcuts') cb.onShortcuts();
+    else if (id === 'review') cb.onReview();
     else cb.onExport(id);
   }
 
@@ -493,6 +517,12 @@ export class Chrome {
     const shown = SEVERITY_ORDER.filter((sev) => this.sevShown.has(sev));
     this.sevUnit.textContent = shown.length === 1 && s.visibleCounts[shown[0]] === 1 ? 'finding' : 'findings';
 
+    this.reviewBtn.setAttribute('aria-pressed', s.walking ? 'true' : 'false');
+    this.reviewBtn.title = s.walking
+      ? 'End the review walk (Escape). It remembers its place for this revision.'
+      : 'Review the claims one by one (R): each is selected here and its cited lines are opened and highlighted in the editor beside. Focus stays here.';
+    this.reviewBtn.setAttribute('aria-label', s.walking ? 'Review walk running; press to end it' : 'Review the claims');
+
     this.syncSearch();
     this.renderStatus(s);
     this.fitRow();
diff --git a/webview/src/ui/commands.ts b/webview/src/ui/commands.ts
index 7a2b297e..4d37313c 100644
--- a/webview/src/ui/commands.ts
+++ b/webview/src/ui/commands.ts
@@ -38,6 +38,14 @@ export interface CommandPort {
   focusRailTabs(): void;
   toggleShortcuts(): void;
   cycleConnections(backwards: boolean): boolean;
+  /** Viewer M3: the review walk (see `KeyCommands`). */
+  walking(): boolean;
+  review(): void;
+  walkStep(delta: number): boolean;
+  walkQuote(delta: number): boolean;
+  walkNotObserved(backwards: boolean): boolean;
+  /** Viewer M3: `n` / `p` while the walk runs: the next or previous finding in the walk's order. */
+  walkFindings(backwards: boolean): boolean;
 }
 
 /** Every rail tab, in strip order: About, Findings, Selection, Outline (viewer M2). */
@@ -64,6 +72,8 @@ export function canvasCommands(port: CommandPort): KeyCommands {
     focusSearch: () => port.focusSearch(),
     escape: () => port.dismissTopmost(),
     cycleIssue: (backwards) => {
+      // Viewer M3: while the review walk runs, n / p move the walk to the next or previous finding.
+      if (port.walking()) return port.walkFindings(backwards);
       const issues = port.visibleIssues();
       if (!issues.length) return false;
       const current = port.selectedIssueId();
@@ -91,5 +101,10 @@ export function canvasCommands(port: CommandPort): KeyCommands {
     focusRailTabs: () => port.focusRailTabs(),
     toggleShortcuts: () => port.toggleShortcuts(),
     cycleConnections: (backwards) => port.cycleConnections(backwards),
+    walking: () => port.walking(),
+    review: () => port.review(),
+    walkStep: (delta) => port.walkStep(delta),
+    walkQuote: (delta) => port.walkQuote(delta),
+    walkNotObserved: (backwards) => port.walkNotObserved(backwards),
   };
 }
diff --git a/webview/src/ui/hostnotice.ts b/webview/src/ui/hostnotice.ts
index 8ee935a4..141c6cfa 100644
--- a/webview/src/ui/hostnotice.ts
+++ b/webview/src/ui/hostnotice.ts
@@ -19,6 +19,8 @@ const WARN_CODES = new Set(['stale', 'root-hint']);
 export interface HostNoticeCallbacks {
   /** The root hint's actions; the host decides which folder. */
   onWorkspaceHint(action: 'add' | 'open'): void;
+  /** Viewer M3: the stale notice's "Review affected claims" starts the walk on Changed files. */
+  onReviewAffected(): void;
 }
 
 export class HostNotice {
@@ -27,6 +29,12 @@ export class HostNotice {
   private text: HTMLElement;
   private actions: HTMLElement;
   private cb: HostNoticeCallbacks;
+  /** Viewer M3: "Review affected claims", offered under a stale notice while claims cite those files. */
+  private review: HTMLButtonElement;
+  private reviewCount = 0;
+  private walking = false;
+  private message = '';
+  private codes: readonly string[] = [];
 
   constructor(cb: HostNoticeCallbacks) {
     this.cb = cb;
@@ -37,6 +45,22 @@ export class HostNotice {
     this.icon.setAttribute('aria-hidden', 'true');
     this.text = add(this.root, el('p', 'mlv-hostnotice__text'));
     this.actions = add(this.root, el('div', 'mlv-hostnotice__actions'));
+    this.review = button('mlv-btn mlv-hostnotice__review', 'Review affected claims');
+    this.review.setAttribute('data-notice-action', 'review');
+    on(this.review, 'click', () => this.cb.onReviewAffected());
+  }
+
+  /**
+   * Viewer M3: how many claims cite a changed or missing file (the walk's Changed files count), and
+   * whether the walk is running. The action is offered under the host's `stale` notice when that
+   * count is above zero and the walk is not already running (it would be a second tab stop before
+   * the diagram, and the walk bar has the filter).
+   */
+  setReview(count: number, walking: boolean): void {
+    if (count === this.reviewCount && walking === this.walking) return;
+    this.reviewCount = count;
+    this.walking = walking;
+    this.syncActions();
   }
 
   /** Show the host's text, or hide the notice when it is empty. */
@@ -49,8 +73,21 @@ export class HostNotice {
     this.text.textContent = message;
     clear(this.icon);
     if (kind !== 'info') this.icon.appendChild(uiIcon('warning', 14));
+    this.message = message;
+    this.codes = list;
+    this.syncActions();
+  }
+
+  private syncActions(): void {
+    const message = this.message;
+    const list = this.codes;
     clear(this.actions);
     this.actions.hidden = true;
+    if (message && list.indexOf('stale') >= 0 && this.reviewCount > 0 && !this.walking) {
+      this.review.title = 'Walk the ' + this.reviewCount + (this.reviewCount === 1 ? ' claim' : ' claims') + ' whose quotes cite a file that changed or went missing; nothing stale is opened';
+      this.actions.appendChild(this.review);
+      this.actions.hidden = false;
+    }
     if (message && list.indexOf('root-hint') >= 0) {
       const addBtn = button('mlv-btn mlv-btn--primary', 'Add folder to workspace');
       addBtn.setAttribute('data-workspace-hint', 'add');
diff --git a/webview/src/ui/keymap.ts b/webview/src/ui/keymap.ts
index c69e781f..c4d7cc98 100644
--- a/webview/src/ui/keymap.ts
+++ b/webview/src/ui/keymap.ts
@@ -47,6 +47,16 @@ export interface KeyCommands {
   toggleShortcuts(): void;
   /** `e` / `Shift+E`: walk the selection's connections. */
   cycleConnections(backwards: boolean): boolean;
+  /** Viewer M3: the review walk is running (j, k, ↓, ↑, [ and ] answer only then). */
+  walking(): boolean;
+  /** Viewer M3, `r`: start the review walk where it was left in this revision, or end it. */
+  review(): void;
+  /** Viewer M3, while walking: j / ↓ (+1) and k / ↑ (-1) step through the claims. */
+  walkStep(delta: number): boolean;
+  /** Viewer M3, while walking: `]` (+1) and `[` (-1) step through the claim's quotes. */
+  walkQuote(delta: number): boolean;
+  /** Viewer M3, `u` / `Shift+U`: start the walk on the claims not observed, or step through them. */
+  walkNotObserved(backwards: boolean): boolean;
 }
 
 export interface KeyBinding {
@@ -60,12 +70,18 @@ export const KEYMAP: KeyBinding[] = [
   // bar. `Mod+F` is printed Cmd+F (⌘F) on macOS and Ctrl+F elsewhere (ui/platform.ts). Viewer M2
   // live fix: Ctrl/Cmd+K is gone; the workbench reads Cmd+K (macOS) and Ctrl+K as a chord prefix.
   { keys: ['Mod+F', '/'], action: 'focusSearch', description: 'Search steps, findings, IDs, or cited text' },
-  { keys: ['n', 'p'], action: 'cycleIssue', description: 'Next / previous finding (document order)' },
+  { keys: ['n', 'p'], action: 'cycleIssue', description: 'Next / previous finding (document order); in the review walk, in the walk\'s order' },
   // Viewer M1: a click selects and shows the claim; opening the source is Enter (or a double-click).
-  { keys: ['Enter'], action: 'open', description: 'Open the cited source beside the diagram; focus stays here' },
+  { keys: ['Enter'], action: 'open', description: 'Open the cited source beside the diagram; focus stays here (in the review walk: open the current quote again)' },
   { keys: ['Alt+Enter'], action: 'openFocus', description: 'Open the cited source and move focus to the editor' },
   { keys: ['Space'], action: 'collapse', description: 'Collapse or expand the selected group' },
-  { keys: ['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'], action: 'move', description: 'Move the selection' },
+  { keys: ['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'], action: 'move', description: 'Move the selection (in the review walk, ↓ and ↑ step through the claims)' },
+  // Viewer M3: the review walk. Plain keys only (the M2 key rule): VS Code leaves them to a focused
+  // webview. `[` and `]` were the scope keys until viewer M2 removed scoping.
+  { keys: ['r'], action: 'review', description: 'Review walk: go claim by claim, each opened and highlighted in the editor beside (starts on the claims not observed; r again or Escape ends it)' },
+  { keys: ['j', 'k'], action: 'walkStep', description: 'In the review walk: next / previous claim' },
+  { keys: ['[', ']'], action: 'walkQuote', description: 'In the review walk: previous / next quote of the claim' },
+  { keys: ['u', 'Shift+U'], action: 'walkNotObserved', description: 'Review walk on the claims not observed: start it, then next / previous one' },
   // Viewer M2: key 0 is the readable first view; the whole document is the ... menu's "Fit the
   // whole diagram" (and Shift+0, which also folds the groups).
   { keys: ['0'], action: 'fit', description: 'Readable view: the whole diagram if it fits at reading size, otherwise phase 1' },
@@ -90,7 +106,7 @@ export const KEYMAP: KeyBinding[] = [
   { keys: ['?'], action: 'shortcuts', description: 'Show this shortcut sheet' },
   // The rungs, in the order `dismissTopmost` runs them (CONTRACTS 11.13). The
   // sheet is the only place the cascade is described to the user (MLV-R1-F2-06).
-  { keys: ['Escape'], action: 'escape', description: 'Close the menu, this sheet, the Refine popover or the legend, collapse the bottom panel, exit focus mode, clear the selection, leave the canvas' },
+  { keys: ['Escape'], action: 'escape', description: 'Close the menu, this sheet, the Refine popover or the legend, end the review walk, collapse the bottom panel, exit focus mode, clear the selection, leave the canvas' },
   { keys: ['Tab', 'Shift+Tab'], action: 'browser', description: 'Move focus out of the diagram (never intercepted)' },
 ];
 
@@ -143,6 +159,29 @@ export function handleCanvasKey(ev: KeyboardEvent, cmd: KeyCommands): boolean {
     if (!cmd.escape()) return false;
     return consume();
   }
+  // Viewer M3: the review walk. `r` starts or ends it; `u` / Shift+U start it on the claims not
+  // observed or step through them (branch on shiftKey: Caps Lock sends 'U' for a plain u). While it
+  // runs, j / k and ↓ / ↑ step and [ / ] change the quote; outside it those keys keep their meaning
+  // (the arrows move spatially) or are left unconsumed.
+  if (key === 'r' || key === 'R') {
+    cmd.review();
+    return consume();
+  }
+  if (key === 'u' || key === 'U') {
+    if (!cmd.walkNotObserved(ev.shiftKey)) return false;
+    return consume();
+  }
+  if (cmd.walking()) {
+    const step = key === 'j' || key === 'J' || key === 'ArrowDown' ? 1 : key === 'k' || key === 'K' || key === 'ArrowUp' ? -1 : 0;
+    if (step) {
+      if (!cmd.walkStep(step)) return false;
+      return consume();
+    }
+    if (key === '[' || key === ']') {
+      if (!cmd.walkQuote(key === ']' ? 1 : -1)) return false;
+      return consume();
+    }
+  }
   if (key === 'n' || key === 'N' || key === 'p' || key === 'P') {
     if (!cmd.cycleIssue(key === 'p' || key === 'P')) return false;
     return consume();
diff --git a/webview/src/ui/moremenu.ts b/webview/src/ui/moremenu.ts
index 2520b9e0..15a00a24 100644
--- a/webview/src/ui/moremenu.ts
+++ b/webview/src/ui/moremenu.ts
@@ -1,6 +1,6 @@
 /**
- * The header's ... menu (viewer M2): the view toggles, the whole-diagram fit, the exports and the
- * shortcut sheet, plus whatever the header has no room for: search and the revision below 620 px,
+ * The header's ... menu (viewer M2): the review walk (viewer M3), the view toggles, the whole-diagram
+ * fit, the exports and the shortcut sheet, plus whatever the header has no room for: search and the revision below 620 px,
  * and, in a row too narrow for its controls, the revision and the "not observed" toggle.
  *
  * The standard menu-button pattern, as the export menu it replaces used it (VW-03): the trigger is
@@ -21,6 +21,7 @@ export type MoreItemId =
   | 'search'
   | 'about'
   | 'exceptions'
+  | 'review'
   | 'legend'
   | 'flow'
   | 'minimap'
@@ -49,6 +50,9 @@ const ITEMS: ItemSpec[] = [
   { id: 'search', label: 'Search steps and findings', icon: 'search', keys: 'Mod+F', folded: true },
   { id: 'about', label: 'About this revision', icon: 'info', folded: true },
   { id: 'exceptions', label: 'Not observed', icon: 'notobserved', check: true, folded: true },
+  // Viewer M3: the review walk, always here (the header's Review button folds first when the row
+  // is short); "End the review" while it runs.
+  { id: 'review', label: 'Review the claims', icon: 'review', keys: 'R', group: true },
   { id: 'legend', label: 'Legend', icon: 'legend', keys: 'L', check: true, group: true },
   { id: 'flow', label: 'Connection flow animation', icon: 'flow', keys: 'A', check: true },
   { id: 'minimap', label: 'Overview map', icon: 'minimap', check: true },
@@ -85,6 +89,8 @@ export interface MoreMenuState {
    */
   minimapUnavailable: string | null;
   railOpen: boolean;
+  /** Viewer M3: the review walk is running (the item reads "End the review"). */
+  walking: boolean;
   /** Viewer M2: the rail item is "Side panel" while docked and "Bottom panel" as a sheet. */
   railMode: 'docked' | 'sheet';
   hasSelection: boolean;
@@ -226,6 +232,14 @@ export class MoreMenu {
         if (label) label.textContent = s.exceptionsLabel;
         item.title = s.exceptionsOn ? 'The observed claims are faded; choose to show them again' : 'Fade the observed claims so these stand out';
       }
+      if (id === 'review') {
+        const label = item.querySelector('.mlv-moremenu__label');
+        if (label) label.textContent = s.walking ? 'End the review' : 'Review the claims';
+        item.title = s.walking
+          ? 'End the review walk (Escape); it remembers its place for this revision'
+          : 'Walk the claims one by one, each opened and highlighted in the editor beside; focus stays here';
+        item.disabled = !s.canExport;
+      }
       if (id === 'rail') {
         const label = item.querySelector('.mlv-moremenu__label');
         if (label) label.textContent = s.railMode === 'sheet' ? 'Bottom panel' : 'Side panel';
diff --git a/webview/src/ui/rail.ts b/webview/src/ui/rail.ts
index 1e3ce0f3..9da6771e 100644
--- a/webview/src/ui/rail.ts
+++ b/webview/src/ui/rail.ts
@@ -16,6 +16,7 @@ import { renderIssuePanel } from './issuelist.js';
 import { renderOutlineTree } from './outline.js';
 import type { RelationMode } from './outline.js';
 import { renderSelectionPane } from './selection.js';
+import type { WalkMark } from './selection.js';
 import { renderAboutPane } from './about.js';
 import type { Issue, Loc, MLEdge, MLNode, RailTab, RelatedLoc, StaleReason, WorkflowDocument } from '../types.js';
 import type { GraphIndex } from '../layout/model.js';
@@ -81,6 +82,8 @@ export interface RailState {
   document: WorkflowDocument | null;
   /** Viewer M2: the Selection pane's columns (two in a sheet at least 620 px wide). */
   columns: 1 | 2;
+  /** Viewer M3: the review walk's quote mark for the Selection pane, while it shows the walk's claim. */
+  walk?: WalkMark | null;
 }
 
 /** The tabs, in order. The Selection tab keeps the id `inspector` (saved view states use it). */
@@ -494,6 +497,7 @@ export class Rail {
       columns: s.columns,
       document: s.document,
       staleReason: s.staleReason,
+      walk: s.walk || null,
     }, {
       onOpen: (loc, focusEditor) => this.cb.onOpen(loc, focusEditor),
       onShowNode: (id) => this.cb.onShowNode(id),
diff --git a/webview/src/ui/selection.ts b/webview/src/ui/selection.ts
index c03f238d..886d7180 100644
--- a/webview/src/ui/selection.ts
+++ b/webview/src/ui/selection.ts
@@ -34,6 +34,8 @@ import { edgeKindText } from '../render/edges.js';
 import { issueStaleReasons, staleChipText, suggestionBlock, wireOpenControl } from './issuelist.js';
 import { allElsewhere, staleQuotes, STALE_TEXT } from '../freshness.js';
 import { uiIcon } from '../icons.js';
+import { walkQuoteText } from '../walk.js';
+import type { WalkOpenStatus } from '../walk.js';
 import type { GraphIndex } from '../layout/model.js';
 import type { Issue, Loc, MLEdge, MLNode, RelatedLoc, Sel, StaleReason, WorkflowDocument } from '../types.js';
 
@@ -55,6 +57,17 @@ export interface SelectionPaneState {
   /** The displayed revision: its published hashes decide "unchanged" against "not checked". */
   document: WorkflowDocument | null;
   staleReason?(file: string): StaleReason | undefined;
+  /**
+   * Viewer M3: while the review walk shows this claim, which of its quotes the walk asked the
+   * editor for, and what became of it (`applyWalkMark`).
+   */
+  walk?: WalkMark | null;
+}
+
+/** Viewer M3: the review walk's quote in the pane and what the editor beside shows for it. */
+export interface WalkMark {
+  quote: number;
+  status: WalkOpenStatus;
 }
 
 export interface SelectionPaneCallbacks {
@@ -96,6 +109,41 @@ export function renderSelectionPane(panel: HTMLElement, s: SelectionPaneState, c
   } else {
     add(root, el('p', 'mlv-empty-note', 'Select a step, a connection or a finding to read its claim beside its evidence.'));
   }
+  applyWalkMark(panel, s.walk || null);
+}
+
+/**
+ * Viewer M3: mark the review walk's quote in the pane under `container`: a left rule on that quote
+ * (`.mlv-quote.is-walk`, `data-walk-status`) and one line under it saying what the editor beside
+ * shows: opening, highlighted, or why it was not opened (the host's reason). Any older mark goes.
+ * Updated in place when the host answers, so the pane keeps its scroll and focus. `reveal` (the
+ * walk moved to another quote of the same claim, `[` or `]`) scrolls the pane the least distance
+ * that shows the marked quote, at once (no smooth scroll, so reduced motion needs nothing more).
+ */
+export function applyWalkMark(container: HTMLElement | null, mark: WalkMark | null, reveal = false): void {
+  if (!container) return;
+  for (const old of Array.from(container.querySelectorAll('.mlv-quote.is-walk'))) {
+    old.classList.remove('is-walk');
+    old.removeAttribute('data-walk-status');
+    const line = old.querySelector('.mlv-quote__walk');
+    if (line) line.remove();
+  }
+  if (!mark) return;
+  const quotes = container.querySelectorAll('.mlv-sel .mlv-insp__source-evidence > .mlv-quote');
+  const li = quotes[mark.quote] as HTMLElement | undefined;
+  if (!li) return;
+  li.classList.add('is-walk');
+  li.setAttribute('data-walk-status', mark.status.state);
+  const text = walkQuoteText(mark.status);
+  if (text) {
+    const line = el('p', 'mlv-quote__walk');
+    if (mark.status.state === 'blocked' || mark.status.state === 'failed') line.appendChild(uiIcon('warning', 12));
+    add(line, el('span', '', text));
+    const head = li.querySelector('.mlv-quote__head');
+    if (head && head.nextSibling) li.insertBefore(line, head.nextSibling);
+    else li.appendChild(line);
+  }
+  if (reveal && typeof li.scrollIntoView === 'function') li.scrollIntoView({ block: 'nearest' });
 }
 
 /** The claim column and the evidence column; one container when the pane has one column. */
diff --git a/webview/src/ui/walkbar.ts b/webview/src/ui/walkbar.ts
new file mode 100644
index 00000000..dfeaeeba
--- /dev/null
+++ b/webview/src/ui/walkbar.ts
@@ -0,0 +1,194 @@
+/**
+ * The review walk's bar (viewer M3, roadmap step 11): a band at the FOOT OF THE DIAGRAM COLUMN,
+ * shown only while the walk runs: directly above the bottom sheet's tabs (with the side panel, at
+ * 1260 px and wider, along the bottom of the diagram). It is a flex row of the diagram column, so
+ * it never covers a card, and it comes after the canvas in the document, so Tab goes canvas, walk
+ * controls, then the claim in the sheet.
+ *
+ *   Claim 3 of 16 · Not observed   [Not observed 16] [Findings 4] [All 176]   j k step · [ ] quotes · Esc exits   [Exit]
+ *   In the editor beside: train.py · lines 12–14, highlighted. Focus stays here.
+ *
+ * Below 620 px (the measured beside-the-code panel is 541 px) it is one row: "3/16", the filters
+ * and Exit. The key hint and the editor line go; a quote the host did not open puts a warning
+ * mark on the position, and the Selection pane says why.
+ *
+ * The controls are ONE `role="toolbar"` tab stop (the filters and Exit; the arrow keys move
+ * between them). The diagram keeps its place within four Tab presses of the top while the walk
+ * runs, and Tab is never held here. The bar itself is a labelled region. Everything it says is derived from
+ * the authored ids and basis, the host's stale files and the host's answers; nothing is a verdict.
+ */
+
+import { add, button, clear, el, on } from '../dom.js';
+import { uiIcon } from '../icons.js';
+import { RovingGroup } from './roving.js';
+import { FILTER_LABEL, WALK_FILTERS, walkEditorText } from '../walk.js';
+import type { WalkFilter, WalkOpenStatus } from '../walk.js';
+
+export interface WalkBarCallbacks {
+  onFilter(filter: WalkFilter): void;
+  /** Exit, or Escape inside the bar: the walk ends and the diagram gets the focus back. */
+  onExit(): void;
+  /**
+   * A walk key pressed while the focus is in the bar (j, k, [, ], u, U, n, p). True when the walk
+   * used it.
+   */
+  onKey(ev: KeyboardEvent): boolean;
+}
+
+export interface WalkBarState {
+  /** 0-based place in the filtered list, and its length. */
+  position: number;
+  total: number;
+  filter: WalkFilter;
+  counts: Record;
+  offered: readonly WalkFilter[];
+  status: WalkOpenStatus;
+  /** Below 620 px: "3/16", the filters and Exit only. */
+  narrow: boolean;
+}
+
+/** The keys the bar hands to the walk when one of its controls has the focus. */
+const WALK_KEYS = new Set(['j', 'J', 'k', 'K', '[', ']', 'u', 'U', 'n', 'N', 'p', 'P']);
+
+export class WalkBar {
+  readonly root: HTMLElement;
+  private pos: HTMLElement;
+  private posText: HTMLElement;
+  private posMark: HTMLElement;
+  private tools: HTMLElement;
+  private filters = new Map();
+  private keys: HTMLElement;
+  private exit: HTMLButtonElement;
+  private editor: HTMLElement;
+  private editorText: HTMLElement;
+  private editorIcon: HTMLElement;
+  private roving: RovingGroup;
+
+  constructor(cb: WalkBarCallbacks) {
+    this.root = el('section', 'mlv-walkbar');
+    this.root.setAttribute('aria-label', 'Review walk');
+    this.root.hidden = true;
+
+    const row = add(this.root, el('div', 'mlv-walkbar__row'));
+    this.pos = add(row, el('p', 'mlv-walkbar__pos'));
+    this.posMark = add(this.pos, el('span', 'mlv-walkbar__mark'));
+    this.posMark.setAttribute('aria-hidden', 'true');
+    this.posMark.appendChild(uiIcon('warning', 12));
+    this.posMark.hidden = true;
+    this.posText = add(this.pos, el('span', 'mlv-walkbar__postext'));
+
+    this.tools = add(row, el('div', 'mlv-walkbar__tools'));
+    this.tools.setAttribute('role', 'toolbar');
+    this.tools.setAttribute('aria-label', 'Review walk controls');
+    const group = add(this.tools, el('div', 'mlv-walkbar__filters'));
+    group.setAttribute('role', 'group');
+    group.setAttribute('aria-label', 'Which claims to walk');
+    for (const filter of WALK_FILTERS) {
+      // Not a `.mlv-chip--btn`: an unpressed filter is one of several choices, never struck through.
+      const b = button('mlv-walkbar__filter', '');
+      b.setAttribute('data-walk-filter', filter);
+      b.setAttribute('aria-pressed', 'false');
+      add(b, el('span', 'mlv-walkbar__flabel', FILTER_LABEL[filter]));
+      add(b, el('span', 'mlv-walkbar__fcount', '0'));
+      on(b, 'click', () => cb.onFilter(filter));
+      this.filters.set(filter, b);
+      group.appendChild(b);
+    }
+    this.keys = add(this.tools, el('span', 'mlv-walkbar__keys'));
+    this.keys.setAttribute('aria-hidden', 'true');
+    for (const [k, what] of [['j k', 'step'], ['[ ]', 'quotes'], ['Enter', 'opens again'], ['Esc', 'exits']]) {
+      const part = add(this.keys, el('span', 'mlv-walkbar__key'));
+      for (const one of k.split(' ')) add(part, el('kbd', 'mlv-kbd', one));
+      add(part, el('span', '', ' ' + what));
+    }
+    this.exit = button('mlv-btn mlv-walkbar__exit', '', 'Exit the review (Escape)');
+    this.exit.appendChild(uiIcon('close', 12));
+    add(this.exit, el('span', 'mlv-walkbar__exitlabel', 'Exit'));
+    this.exit.title = 'Exit the review (Escape). The walk remembers its place for this revision.';
+    on(this.exit, 'click', () => cb.onExit());
+    this.tools.appendChild(this.exit);
+
+    this.editor = add(this.root, el('p', 'mlv-walkbar__editor'));
+    this.editorIcon = add(this.editor, el('span', 'mlv-walkbar__editoricon'));
+    this.editorIcon.setAttribute('aria-hidden', 'true');
+    this.editorIcon.appendChild(uiIcon('warning', 12));
+    this.editorText = add(this.editor, el('span', 'mlv-walkbar__editortext'));
+
+    on(this.root, 'keydown', (ev: KeyboardEvent) => {
+      if (ev.defaultPrevented || ev.ctrlKey || ev.metaKey || ev.altKey) return;
+      if (ev.key === 'Escape') {
+        ev.preventDefault();
+        ev.stopPropagation();
+        cb.onExit();
+        return;
+      }
+      if (!WALK_KEYS.has(ev.key)) return;
+      if (cb.onKey(ev)) ev.preventDefault();
+    });
+    this.roving = new RovingGroup(this.tools);
+  }
+
+  get shown(): boolean {
+    return !this.root.hidden;
+  }
+
+  /** Show the bar with this state, or hide it (`null`). */
+  update(s: WalkBarState | null): void {
+    if (!s) {
+      this.root.hidden = true;
+      return;
+    }
+    this.root.hidden = false;
+    this.root.setAttribute('data-layout', s.narrow ? 'narrow' : 'wide');
+    const problem = s.status.state === 'blocked' || s.status.state === 'failed';
+    this.root.setAttribute('data-walk-status', s.status.state);
+    const label = FILTER_LABEL[s.filter];
+    const place = s.total ? 'Claim ' + (s.position + 1) + ' of ' + s.total : 'No claims';
+    this.posText.textContent = s.narrow ? (s.total ? s.position + 1 + '/' + s.total : '0/0') : place + ' · ' + label;
+    this.posMark.hidden = !(problem && s.narrow);
+    const editorLine = walkEditorText(s.status);
+    // The narrow form keeps the whole sentence for assistive technology and the tooltip.
+    this.pos.title = place + ' · ' + label + (s.narrow ? '. ' + editorLine : '');
+    this.pos.setAttribute('aria-label', place + ', ' + label + (problem && s.narrow ? '. ' + editorLine : ''));
+    for (const [filter, b] of this.filters) {
+      const offered = s.offered.indexOf(filter) >= 0;
+      b.hidden = !offered;
+      b.setAttribute('aria-pressed', filter === s.filter ? 'true' : 'false');
+      const count = b.querySelector('.mlv-walkbar__fcount');
+      if (count) count.textContent = String(s.counts[filter]);
+      const n = s.counts[filter];
+      const units = n === 1 ? ' claim' : ' claims';
+      b.setAttribute('aria-label', FILTER_LABEL[filter] + ', ' + n + units);
+      b.title = filterTitle(filter, n);
+    }
+    this.keys.hidden = s.narrow;
+    this.editor.hidden = s.narrow;
+    this.editor.setAttribute('data-walk-status', s.status.state);
+    this.editorIcon.hidden = !problem;
+    this.editorText.textContent = editorLine;
+    this.roving.sync();
+  }
+
+  /** The bar's tab stop (a filter or Exit), for a test or a caller that moves the focus here. */
+  focus(): void {
+    const stop = Array.from(this.tools.querySelectorAll('button')).find((b) => b.tabIndex === 0 && !b.hidden);
+    try {
+      (stop || this.exit).focus();
+    } catch (_e) {
+      /* a detached bar cannot take the focus */
+    }
+  }
+
+  destroy(): void {
+    this.roving.destroy();
+    clear(this.root);
+  }
+}
+
+function filterTitle(filter: WalkFilter, n: number): string {
+  const count = n + (n === 1 ? ' claim' : ' claims');
+  if (filter === 'notObserved') return 'Walk the ' + count + ' the author marked inferred or unresolved (the header\'s "not observed" count)';
+  if (filter === 'findings') return 'Walk the ' + count + ' that are findings';
+  if (filter === 'changed') return 'Walk the ' + count + ' whose quotes cite a file that changed or went missing since publishing';
+  return 'Walk all ' + count + ': every step, connection and finding';
+}
diff --git a/webview/src/walk.ts b/webview/src/walk.ts
new file mode 100644
index 00000000..fdff182b
--- /dev/null
+++ b/webview/src/walk.ts
@@ -0,0 +1,299 @@
+/**
+ * The review walk's claims (viewer M3, roadmap step 11): every step, connection and finding of the
+ * displayed revision once, in the canvas's drawn order, and the filters over them. Pure: no DOM,
+ * no App, nothing called; everything here is the authored ids, the authored basis and the host's
+ * stale files.
+ *
+ * ORDER (spec-reading §4.2). The lanes in phase order; in each lane its steps as the canvas draws
+ * their boxes and the Outline lists them: document order, a group before the steps it contains,
+ * depth first. Each step is followed by its outgoing connections in document order, then by the
+ * findings whose first cited step (in this order) it is, in document order. The design gives no
+ * place to a finding that cites no step (one that cites only connections, or the workflow as a
+ * whole), so those come LAST, in document order. A connection whose source step the document
+ * lacks also comes last; validation refuses such a document, and the walk still visits every
+ * claim exactly once.
+ */
+
+import { allElsewhere } from './freshness.js';
+import { authoredCell } from './notebook.js';
+import type { GraphIndex } from './layout/model.js';
+import type { Loc, Sel, StaleReason } from './types.js';
+
+/** A claim is a step (node), a connection (edge) or a finding (issue), named by its authored id. */
+export type Claim = Sel;
+
+/** The walk's filters, in the order the walk bar offers them. */
+export type WalkFilter = 'notObserved' | 'findings' | 'changed' | 'all';
+export const WALK_FILTERS: readonly WalkFilter[] = ['notObserved', 'findings', 'changed', 'all'];
+
+/** The walk bar's words for each filter. */
+export const FILTER_LABEL: Record = {
+  notObserved: 'Not observed',
+  findings: 'Findings',
+  changed: 'Changed files',
+  all: 'All',
+};
+
+/** What the live region says for the filter (nothing for All: every claim is in it). */
+const FILTER_SPOKEN: Record = {
+  notObserved: 'not observed',
+  findings: 'findings',
+  changed: 'changed files',
+  all: '',
+};
+
+/**
+ * The basis the header's "not observed" chip counts (`notObservedCounts`): inferred or unresolved.
+ * One predicate for both, so the walk's Not observed filter and the header can never disagree.
+ */
+export function isNotObserved(basis: string | undefined): boolean {
+  return !!basis && basis !== 'observed';
+}
+
+export function sameClaim(a: Claim | null | undefined, b: Claim | null | undefined): boolean {
+  return !!a && !!b && a.kind === b.kind && a.id === b.id;
+}
+
+/** Every claim once, in the drawn order (see the file comment). */
+export function claimOrder(index: GraphIndex): Claim[] {
+  const out: Claim[] = [];
+  const nodeAt = new Map();
+  const nodes: string[] = [];
+  const visit = (id: string): void => {
+    if (nodeAt.has(id) || !index.nodeById.has(id)) return;
+    nodeAt.set(id, nodes.length);
+    nodes.push(id);
+    for (const child of index.laneChildren(id)) visit(child);
+  };
+  for (const lane of index.lanes) for (const root of index.roots(lane.id)) visit(root);
+  // A step the drawn hierarchy did not reach (none can, today) still gets its turn.
+  for (const node of index.graph.nodes || []) visit(node.id);
+
+  // Each finding goes after its first cited step in this order; one that cites no step goes last.
+  const homed = new Map();
+  const homeless: string[] = [];
+  for (const issue of index.graph.issues || []) {
+    let home: string | null = null;
+    for (const id of issue.nodeIds || []) {
+      const at = nodeAt.get(id);
+      if (at !== undefined && (home === null || at < (nodeAt.get(home) as number))) home = id;
+    }
+    if (home === null) homeless.push(issue.id);
+    else {
+      const list = homed.get(home);
+      if (list) list.push(issue.id);
+      else homed.set(home, [issue.id]);
+    }
+  }
+
+  const seenEdges = new Set();
+  const seenIssues = new Set();
+  const pushIssue = (id: string): void => {
+    if (seenIssues.has(id)) return;
+    seenIssues.add(id);
+    out.push({ kind: 'issue', id });
+  };
+  for (const id of nodes) {
+    out.push({ kind: 'node', id });
+    for (const edge of index.outEdges.get(id) || []) {
+      if (seenEdges.has(edge.id)) continue;
+      seenEdges.add(edge.id);
+      out.push({ kind: 'edge', id: edge.id });
+    }
+    for (const issueId of homed.get(id) || []) pushIssue(issueId);
+  }
+  for (const edge of index.graph.edges || []) {
+    if (seenEdges.has(edge.id)) continue;
+    seenEdges.add(edge.id);
+    out.push({ kind: 'edge', id: edge.id });
+  }
+  for (const id of homeless) pushIssue(id);
+  return out;
+}
+
+/** The claim's authored basis. */
+export function claimBasis(index: GraphIndex, claim: Claim): string | undefined {
+  if (claim.kind === 'node') return index.nodeById.get(claim.id)?.basis;
+  if (claim.kind === 'edge') return index.edgeById.get(claim.id)?.basis;
+  return index.issueById.get(claim.id)?.basis;
+}
+
+/**
+ * The claim's quotes, in the order its Selection pane numbers them: a step's or connection's own
+ * evidence; a finding's supporting evidence, then its counter-evidence.
+ */
+export function claimLocs(index: GraphIndex, claim: Claim): Loc[] {
+  if (claim.kind === 'node') return index.nodeById.get(claim.id)?.evidenceLocs || [];
+  if (claim.kind === 'edge') return index.edgeById.get(claim.id)?.evidenceLocs || [];
+  return index.issueById.get(claim.id)?.relatedLocs || [];
+}
+
+/**
+ * Whether the Changed files filter is offered: the host reports stale files and not every one is
+ * only in another folder (the root hint's case, where nothing changed and the notice says which
+ * folder to add). In a mix, a file in another folder counts as missing, as the status bar says.
+ */
+export function changedOffered(reasons: readonly StaleReason[]): boolean {
+  return reasons.length > 0 && !allElsewhere(reasons);
+}
+
+export type StaleTest = (file: string) => boolean;
+
+/** Whether `claim` belongs to `filter`. */
+export function inFilter(filter: WalkFilter, index: GraphIndex, claim: Claim, isStale: StaleTest): boolean {
+  if (filter === 'all') return true;
+  if (filter === 'findings') return claim.kind === 'issue';
+  if (filter === 'notObserved') return isNotObserved(claimBasis(index, claim));
+  return claimLocs(index, claim).some((loc) => !!loc.file && isStale(loc.file));
+}
+
+/** The claims of `filter`, in the walk's order. */
+export function filterClaims(order: readonly Claim[], filter: WalkFilter, index: GraphIndex, isStale: StaleTest): Claim[] {
+  return order.filter((claim) => inFilter(filter, index, claim, isStale));
+}
+
+/** How many claims each filter holds. */
+export function filterCounts(order: readonly Claim[], index: GraphIndex, isStale: StaleTest): Record {
+  const counts: Record = { notObserved: 0, findings: 0, changed: 0, all: 0 };
+  for (const claim of order) for (const filter of WALK_FILTERS) if (inFilter(filter, index, claim, isStale)) counts[filter]++;
+  return counts;
+}
+
+/**
+ * The filters the walk bar offers: All always; the others only when they hold a claim (as the
+ * header hides "not observed" when nothing is), and Changed files only while it is offered at all.
+ */
+export function offeredFilters(counts: Record, changed: boolean): WalkFilter[] {
+  return WALK_FILTERS.filter((filter) => filter === 'all' || (counts[filter] > 0 && (filter !== 'changed' || changed)));
+}
+
+/**
+ * Where a walk over `list` starts or continues for `anchor`: the anchor itself when the list holds
+ * it; else the first claim after it in the drawn order; else (nothing comes after it) the list's
+ * last claim. No anchor: the first claim. -1 for an empty list.
+ */
+export function positionFor(list: readonly Claim[], anchor: Claim | null | undefined, order: readonly Claim[]): number {
+  if (!list.length) return -1;
+  if (!anchor) return 0;
+  const exact = list.findIndex((claim) => sameClaim(claim, anchor));
+  if (exact >= 0) return exact;
+  const rank = new Map();
+  order.forEach((claim, i) => rank.set(claim.kind + ':' + claim.id, i));
+  const at = rank.get(anchor.kind + ':' + anchor.id);
+  if (at === undefined) return 0;
+  const after = list.findIndex((claim) => (rank.get(claim.kind + ':' + claim.id) ?? -1) > at);
+  return after >= 0 ? after : list.length - 1;
+}
+
+/** "Step", "Group", "Connection" or "Finding": what the claim is, in the viewer's words. */
+export function claimNoun(index: GraphIndex, claim: Claim): string {
+  if (claim.kind === 'node') return index.isGroup(claim.id) ? 'Group' : 'Step';
+  return claim.kind === 'edge' ? 'Connection' : 'Finding';
+}
+
+function endsOf(index: GraphIndex, claim: Claim): { from: string; to: string } | null {
+  const edge = index.edgeById.get(claim.id);
+  if (!edge) return null;
+  const from = index.nodeById.get(edge.source);
+  const to = index.nodeById.get(edge.target);
+  return { from: from ? from.label || from.id : edge.source, to: to ? to.label || to.id : edge.target };
+}
+
+/** The claim's authored title: a step's label, a connection's label (or its ends), a finding's F label and title. */
+export function claimTitle(index: GraphIndex, claim: Claim): string {
+  if (claim.kind === 'node') {
+    const node = index.nodeById.get(claim.id);
+    return node ? node.label || node.id : claim.id;
+  }
+  if (claim.kind === 'edge') {
+    const edge = index.edgeById.get(claim.id);
+    const ends = endsOf(index, claim);
+    if (!edge || !ends) return claim.id;
+    return (edge.label ? edge.label + ' · ' : '') + ends.from + ' → ' + ends.to;
+  }
+  const issue = index.issueById.get(claim.id);
+  return issue ? (issue.short ? issue.short + ' ' : '') + issue.title : claim.id;
+}
+
+/** The same title for the live region: a connection reads "label, from A to B", never an arrow. */
+function spokenTitle(index: GraphIndex, claim: Claim): string {
+  if (claim.kind !== 'edge') return claimTitle(index, claim);
+  const edge = index.edgeById.get(claim.id);
+  const ends = endsOf(index, claim);
+  if (!edge || !ends) return claim.id;
+  return (edge.label ? edge.label + ', ' : '') + 'from ' + ends.from + ' to ' + ends.to;
+}
+
+/**
+ * The live region's line for one step of the walk: "Claim 3 of 16, not observed: Step Load
+ * batches, inferred." The basis is said only when it is not observed; the filter only when it is
+ * not All.
+ */
+export function walkAnnouncement(position: number, total: number, filter: WalkFilter, index: GraphIndex, claim: Claim): string {
+  const basis = claimBasis(index, claim);
+  const said = FILTER_SPOKEN[filter];
+  return 'Claim ' + (position + 1) + ' of ' + total + (said ? ', ' + said : '') + ': ' +
+    claimNoun(index, claim) + ' ' + spokenTitle(index, claim) + (isNotObserved(basis) ? ', ' + basis : '') + '.';
+}
+
+/** "train.py · lines 12–14", or "nb.ipynb · cell 24 · lines 1–3" (the cell counted from 0, as recorded). */
+export function walkLocText(loc: Loc): string {
+  const end = loc.endLine && loc.endLine > loc.line ? loc.endLine : loc.line;
+  const lines = end > loc.line ? 'lines ' + loc.line + '–' + end : 'line ' + loc.line;
+  const cell = authoredCell(loc);
+  return loc.file + (cell ? ' · cell ' + cell.cell : '') + ' · ' + lines;
+}
+
+/**
+ * What the editor beside shows for the walk's current claim, as far as the viewer knows: nothing
+ * to open (`none`: the claim cites no lines), no way to open (`unavailable`: the host cannot open
+ * source), not asked yet (`idle`: restored, or the walk followed a click; Enter opens), asked
+ * (`opening`), shown and highlighted (`done`, the host said so), not opened (`blocked`, with the
+ * host's reason, or the viewer's own for a file the host already reported stale) or `failed`.
+ */
+export type WalkOpenState = 'none' | 'unavailable' | 'idle' | 'opening' | 'done' | 'blocked' | 'failed';
+
+export interface WalkOpenStatus {
+  state: WalkOpenState;
+  /** The quote the editor is asked for (absent for `none` and `unavailable`). */
+  loc?: Loc;
+  /** `blocked` and `failed`: the sentence to show, with the reason and that nothing was opened. */
+  message?: string;
+  /** The quote's place among the claim's quotes (0-based), and how many there are. */
+  quote: number;
+  quotes: number;
+}
+
+/** "(quote 2 of 3)" when the claim has more than one quote. */
+function quoteOf(s: WalkOpenStatus): string {
+  return s.quotes > 1 ? ' (quote ' + (s.quote + 1) + ' of ' + s.quotes + ')' : '';
+}
+
+/**
+ * The walk bar's editor line: "In the editor beside: train.py · lines 12–14, highlighted. Focus
+ * stays here." It claims only what the host answered (VW-10): `opening` says it was asked, and a
+ * blocked open says why nothing was opened.
+ */
+export function walkEditorText(s: WalkOpenStatus): string {
+  const where = s.loc ? walkLocText(s.loc) + quoteOf(s) : '';
+  switch (s.state) {
+    case 'none': return 'This claim cites no lines, so nothing is opened for it.';
+    case 'unavailable': return 'This view cannot open source files.';
+    case 'idle': return 'Enter shows ' + where + ' in the editor beside.';
+    case 'opening': return 'Opening in the editor beside: ' + where + '…';
+    case 'done': return 'In the editor beside: ' + where + ', highlighted. Focus stays here.';
+    default: return (s.quotes > 1 ? 'Quote ' + (s.quote + 1) + ' of ' + s.quotes + ': ' : '') + (s.message || 'Not opened.');
+  }
+}
+
+/** The short line under the walk's quote in the Selection pane. */
+export function walkQuoteText(s: WalkOpenStatus): string {
+  switch (s.state) {
+    case 'idle': return 'Enter shows these lines in the editor beside.';
+    case 'opening': return 'Opening in the editor beside…';
+    case 'done': return 'In the editor beside, highlighted.';
+    case 'blocked':
+    case 'failed': return s.message || 'Not opened.';
+    default: return '';
+  }
+}
diff --git a/webview/test/authored-handshake.mjs b/webview/test/authored-handshake.mjs
index c061ed6b..5d690804 100644
--- a/webview/test/authored-handshake.mjs
+++ b/webview/test/authored-handshake.mjs
@@ -474,3 +474,124 @@ export async function authoredEscapeHandshake() {
     rmSync(wire.root, { recursive: true, force: true });
   }
 }
+
+/**
+ * Viewer M3, roadmap steps 11 and 12 together: the review walk in the built viewer driving the
+ * real host. `r` on the diagram starts the walk on the claims not observed; after the pause each
+ * step's quote is opened beside the panel with the focus kept on the diagram and its lines
+ * highlighted; a claim with no quotes clears the highlight; one Escape ends the walk, clears the
+ * highlight and does not reach VS Code. On a stale revision, the notice's "Review affected claims"
+ * walks the claims citing the changed file: the host answers blocked, opens nothing and raises no
+ * notification, and the viewer shows the host's reason. Mock `vscode` and JSDOM: not a live check.
+ */
+export async function authoredWalkHandshake() {
+  const walkDocument = () => {
+    const document = baseDocument();
+    document.nodes.push({ id: 'save', label: 'Save checkpoint', phase: 'loop', basis: 'unresolved', evidence: [] });
+    document.edges.push({ id: 'persist', source: 'update', target: 'save', label: 'weights', basis: 'observed', evidence: ['e2'] });
+    return { ...document, verification: { files: { 'source.py': sha256(SOURCE) }, publishedAt: '2026-09-25T00:00:00Z' } };
+  };
+  const walkResults = (wire) => wire.hostPosts.filter((m) => m.type === 'actionResult' && m.action === 'openLocation');
+
+  // A fresh revision: the walk opens, highlights, clears and ends.
+  let wire = await openWire(walkDocument(), { 'source.py': SOURCE });
+  try {
+    const forwarded = [];
+    const page = mountPage(wire, (win) => win.addEventListener('keydown', (ev) => forwarded.push(ev.key)));
+    await waitFor(() => $(page, '[data-node-id="loss"]'), 'the viewer did not mount');
+    const { window } = page;
+    const press = (key, target = window.document.activeElement) => {
+      const event = new window.KeyboardEvent('keydown', { key, bubbles: true, cancelable: true });
+      target.dispatchEvent(event);
+      return event;
+    };
+    const canvas = $(page, '.mlv-canvas');
+    canvas.focus();
+    assert.equal(press('r').defaultPrevented, true);
+    assert.equal(page.app.walk.active, true);
+    // Not observed: the inferred connection, the inferred finding and the unresolved step.
+    assert.equal($(page, '.mlv-walkbar__postext').textContent, 'Claim 1 of 3 · Not observed');
+    assert.deepEqual(plain(page.app.selection), { kind: 'edge', id: 'step' });
+    await waitFor(() => walkResults(wire).length === 1, 'the host did not answer the walk\'s first open');
+    const request = page.outgoing.filter((m) => m.type === 'openLocation').at(-1);
+    assert.equal(request.walk, true);
+    assert.equal(request.seq, 1);
+    assert.deepEqual(plain(walkResults(wire)[0]), { v: 1, type: 'actionResult', requestId: request.requestId, action: 'openLocation', outcome: 'done', seq: 1 });
+    const shown = vscode.__recorded.shownDocuments;
+    assert.equal(shown.length, 1);
+    assert.equal(shown[0].options.preserveFocus, true, 'the editor opens beside with the focus kept');
+    assert.equal(vscode.__recorded.decorationTypes.length, 1, 'the cited lines are highlighted');
+    assert.equal(vscode.__recorded.decorationTypes[0].disposed, false);
+    await waitFor(() => $(page, '.mlv-walkbar__editor').getAttribute('data-walk-status') === 'done', 'the bar did not show the done answer');
+    assert.equal($(page, '.mlv-walkbar__editortext').textContent, 'In the editor beside: source.py · line 2, highlighted. Focus stays here.');
+    assert.equal(window.document.activeElement, canvas, 'the keyboard stayed on the diagram');
+
+    // The finding, then the step with no quotes: the walk asks the host to clear the highlight.
+    press('j');
+    await waitFor(() => walkResults(wire).length === 2, 'the host did not answer the second open');
+    assert.equal(walkResults(wire)[1].seq, 2);
+    assert.deepEqual(plain(page.app.selection), { kind: 'issue', id: 'risk' });
+    press('j');
+    assert.deepEqual(plain(page.app.selection), { kind: 'node', id: 'save' });
+    assert.equal($(page, '.mlv-walkbar__editortext').textContent, 'This claim cites no lines, so nothing is opened for it.');
+    await waitFor(() => page.outgoing.some((m) => m.type === 'walk' && m.state === 'clear'), 'the walk did not ask for a clear');
+    await waitFor(() => vscode.__recorded.decorationTypes.every((type) => type.disposed), 'the host kept the highlight of the earlier claim');
+
+    // One Escape ends the walk; VS Code never sees it.
+    press('k');
+    await waitFor(() => walkResults(wire).length === 3, 'the host did not answer the step back');
+    await waitFor(() => vscode.__recorded.decorationTypes.some((type) => !type.disposed), 'the step back did not highlight');
+    const event = press('Escape');
+    assert.equal(event.defaultPrevented, true);
+    assert.equal(page.app.walk.active, false, 'one Escape ended the walk');
+    assert.equal($(page, '.mlv-walkbar').hidden, true);
+    assert.ok(page.app.selection, 'the claim stays selected');
+    assert.deepEqual(forwarded.filter((key) => key === 'Escape'), [], 'the Escape did not reach VS Code');
+    await waitFor(() => vscode.__recorded.decorationTypes.every((type) => type.disposed), 'the walk\'s end did not clear the highlight');
+    // The place is kept in the webview's state for this revision, and nothing else is recorded.
+    page.app.saveSoon.flush?.();
+    page.app.bridge.saveState(page.app.getState());
+    assert.deepEqual(plain(wire.state.walk), { filter: 'notObserved', claim: { kind: 'issue', id: 'risk' } });
+    assert.equal(wire.state.workflowRevision, 'r1');
+    assert.equal(vscode.__recorded.messages.filter((m) => m[0] === 'warn' || m[0] === 'error').length, 0, 'no notification');
+    process.stdout.write('  PASS  review walk → opens beside with the focus kept and highlights → a claim with no quotes clears it → Escape ends it\n');
+  } finally {
+    wire.controller.dispose();
+    for (const page of wire.pages) page.window.close();
+    rmSync(wire.root, { recursive: true, force: true });
+  }
+
+  // A stale revision: "Review affected claims" walks the claims citing source.py; nothing opens.
+  wire = await openWire(walkDocument(), { 'source.py': SOURCE + '# edited after publication\n' });
+  try {
+    const page = mountPage(wire);
+    const notice = () => $(page, '.mlv-hostnotice');
+    await waitFor(() => $(page, '[data-node-id="loss"]') && notice() && !notice().hidden, 'the stale revision did not mount with its notice');
+    await waitFor(() => $(page, '[data-notice-action="review"]'), 'the notice did not offer "Review affected claims"');
+    const action = $(page, '[data-notice-action="review"]');
+    assert.equal(action.textContent, 'Review affected claims');
+    const notifications = () => vscode.__recorded.messages.filter((m) => m[0] === 'warn' || m[0] === 'error').length;
+    const before = notifications();
+    action.click();
+    assert.equal(page.app.walk.active, true);
+    assert.equal(page.app.walk.filter, 'changed');
+    // Every claim but the unresolved step cites source.py: 2 steps, 2 connections, 1 finding.
+    assert.equal($(page, '.mlv-walkbar__postext').textContent, 'Claim 1 of 5 · Changed files');
+    assert.equal($(page, '.mlv-walkbar__editortext').textContent, 'source.py: changed since publishing; not opened.', 'said at once');
+    await waitFor(() => walkResults(wire).length === 1, 'the host did not answer the stale open');
+    const result = walkResults(wire)[0];
+    assert.equal(result.outcome, 'blocked');
+    assert.equal(result.seq, 1);
+    assert.equal(vscode.__recorded.shownDocuments.length, 0, 'the changed file was never opened');
+    assert.equal(notifications(), before, 'and the walk raised no notification (the one on load says the revision is stale)');
+    // The host's own words replace the viewer's (one quote, so no "Quote 1 of 1").
+    await waitFor(() => $(page, '.mlv-walkbar__editortext').textContent === result.message, () => 'the bar did not show the host\'s reason: ' + $(page, '.mlv-walkbar__editortext').textContent + ' / ' + result.message);
+    assert.match(result.message, /source\.py/);
+    assert.match(page.window.document.querySelector('.mlv-root > [aria-live]').textContent, /^Not opened: /);
+    process.stdout.write('  PASS  stale revision → "Review affected claims" → blocked by the host, nothing opened, the reason in the bar\n');
+  } finally {
+    wire.controller.dispose();
+    for (const page of wire.pages) page.window.close();
+    rmSync(wire.root, { recursive: true, force: true });
+  }
+}
diff --git a/webview/test/authored-integration.test.mjs b/webview/test/authored-integration.test.mjs
index 6aafc425..e2afd455 100644
--- a/webview/test/authored-integration.test.mjs
+++ b/webview/test/authored-integration.test.mjs
@@ -1,5 +1,5 @@
 import test from 'node:test';
-import { authoredEscapeHandshake, authoredHandshake, authoredStaleHandshake } from './authored-handshake.mjs';
+import { authoredEscapeHandshake, authoredHandshake, authoredStaleHandshake, authoredWalkHandshake } from './authored-handshake.mjs';
 
 test('authored VS Code handshake supports citations, refinement, export, remount and watched revisions', async () => {
   await authoredHandshake();
@@ -12,3 +12,7 @@ test('authored VS Code handshake shows a stale revision as historical inside the
 test('an Escape the viewer acted on stops at the page instead of also reaching VS Code', async () => {
   await authoredEscapeHandshake();
 });
+
+test('the review walk drives the real host: opens beside with the focus kept, highlights, clears, ends; stale claims are blocked', async () => {
+  await authoredWalkHandshake();
+});
diff --git a/webview/test/header-m2.test.mjs b/webview/test/header-m2.test.mjs
index d806dc74..a0a5ed04 100644
--- a/webview/test/header-m2.test.mjs
+++ b/webview/test/header-m2.test.mjs
@@ -96,6 +96,7 @@ function headerShows(ctx) {
   }
   const exceptions = header.querySelector('.mlv-chip--exceptions');
   if (visible(ctx, exceptions)) parts.push(visible(ctx, exceptions.querySelector('.mlv-chip__detail')) ? 'not observed (breakdown)' : 'not observed');
+  if (visible(ctx, header.querySelector('.mlv-header__review'))) parts.push('Review');
   if (visible(ctx, header.querySelector('.mlv-btn--more'))) parts.push('more');
   if (visible(ctx, header.querySelector('.mlv-workflow__refine'))) parts.push('Refine…');
   return parts;
@@ -113,7 +114,7 @@ const menuItems = (ctx) => $$(ctx, '.mlv-moremenu__item').filter((item) => visib
 test('at 1440 px the header row holds every control, with the "not observed" breakdown', async () => {
   const ctx = await mount(doc(), { width: 1440 });
   assert.equal($(ctx, '.mlv-header').getAttribute('data-layout'), 'full');
-  assert.deepEqual(headerShows(ctx), ['title', 'host · revision', 'search field', 'high', 'medium', 'not observed (breakdown)', 'more', 'Refine…']);
+  assert.deepEqual(headerShows(ctx), ['title', 'host · revision', 'search field', 'high', 'medium', 'not observed (breakdown)', 'Review', 'more', 'Refine…']);
   assert.equal($(ctx, '.mlv-header__title').textContent, 'Fine-tune a classifier on CIFAR-10 with mixed precision');
   assert.equal($(ctx, '.mlv-header__title').title, 'Fine-tune a classifier on CIFAR-10 with mixed precision');
   assert.equal($(ctx, '.mlv-header__prov').textContent, 'claude-code · r7');
@@ -124,7 +125,7 @@ test('at 1440 px the header row holds every control, with the "not observed" bre
 test('at 900 px search folds behind an icon and the chip keeps the revision; still one row of controls', async () => {
   const ctx = await mount(doc(), { width: 900 });
   assert.equal($(ctx, '.mlv-header').getAttribute('data-layout'), 'mid');
-  assert.deepEqual(headerShows(ctx), ['title', 'revision', 'search icon', 'high', 'medium', 'not observed', 'more', 'Refine…']);
+  assert.deepEqual(headerShows(ctx), ['title', 'revision', 'search icon', 'high', 'medium', 'not observed', 'Review', 'more', 'Refine…']);
   // The breakdown folds into the accessible name and the tooltip.
   assert.equal($(ctx, '.mlv-chip--exceptions').getAttribute('aria-label'), '3 not observed (1 step, 1 connection, 1 finding)');
   // The icon opens the field and focuses it; leaving it empty folds it again.
@@ -136,7 +137,8 @@ test('at 900 px search folds behind an icon and the chip keeps the revision; sti
   assert.equal($(ctx, '.mlv-header').getAttribute('data-search'), 'closed');
   // The ... menu stands in for nothing at this width: the row has room for every control.
   openMenu(ctx);
-  assert.deepEqual(menuItems(ctx), ['legend', 'flow', 'minimap', 'rail', 'fit', 'zoomsel', 'svg', 'png', 'copy-svg', 'shortcuts']);
+  // Viewer M3: Review is always in the menu too (the header's button folds first on a short row).
+  assert.deepEqual(menuItems(ctx), ['review', 'legend', 'flow', 'minimap', 'rail', 'fit', 'zoomsel', 'svg', 'png', 'copy-svg', 'shortcuts']);
   ctx.app.destroy();
 });
 
@@ -146,7 +148,7 @@ test('at 541 px only the title, the severity toggles, "not observed", ... and Re
   assert.deepEqual(headerShows(ctx), ['title', 'high', 'medium', 'not observed', 'more', 'Refine…']);
   const menu = openMenu(ctx);
   assert.equal(menu.hidden, false);
-  assert.deepEqual(menuItems(ctx), ['search', 'about', 'legend', 'flow', 'minimap', 'rail', 'fit', 'zoomsel', 'svg', 'png', 'copy-svg', 'shortcuts']);
+  assert.deepEqual(menuItems(ctx), ['search', 'about', 'review', 'legend', 'flow', 'minimap', 'rail', 'fit', 'zoomsel', 'svg', 'png', 'copy-svg', 'shortcuts']);
   assert.equal($(ctx, '[data-more-item="about"] .mlv-moremenu__label').textContent, 'About revision r7 · claude-code');
   assert.equal($(ctx, '[data-more-item="rail"] .mlv-moremenu__label').textContent, 'Bottom panel', 'at 541 px the rail is the bottom sheet');
   // The menu's Search opens the field in the title's place.
@@ -177,7 +179,7 @@ test('resizing the panel moves controls between the row and the menu, and the st
   assert.ok(visible(ctx, $(ctx, '.mlv-status .mlv-zoom__value, .mlv-status .mlv-zoom')));
   ctx.resize(1100);
   assert.equal($(ctx, '.mlv-header').getAttribute('data-layout'), 'wide');
-  assert.deepEqual(headerShows(ctx), ['title', 'host · revision', 'search field', 'high', 'medium', 'not observed', 'more', 'Refine…']);
+  assert.deepEqual(headerShows(ctx), ['title', 'host · revision', 'search field', 'high', 'medium', 'not observed', 'Review', 'more', 'Refine…']);
   assert.ok(visible(ctx, $(ctx, '.mlv-status .mlv-zoom__btn')));
   ctx.app.destroy();
 });
@@ -235,15 +237,16 @@ test('the ... menu is a menu button: arrows, Home and End move; Escape and Tab c
   keydown(ctx, button, 'ArrowDown');
   assert.equal(menu.hidden, false);
   assert.equal(button.getAttribute('aria-expanded'), 'true');
-  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'legend');
+  // Viewer M3: the menu starts with Review the claims.
+  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'review');
   keydown(ctx, ctx.document.activeElement, 'ArrowDown');
-  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'flow');
+  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'legend');
   keydown(ctx, ctx.document.activeElement, 'End');
   assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'shortcuts');
   keydown(ctx, ctx.document.activeElement, 'ArrowDown');
-  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'legend', 'the arrows wrap');
+  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'review', 'the arrows wrap');
   keydown(ctx, ctx.document.activeElement, 'Home');
-  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'legend');
+  assert.equal(ctx.document.activeElement.getAttribute('data-more-item'), 'review');
   const esc = keydown(ctx, ctx.document.activeElement, 'Escape');
   assert.equal(esc.defaultPrevented, true);
   assert.equal(menu.hidden, true);
@@ -294,7 +297,7 @@ test('each ... item does what it says: legend, flow, overview map, rail, fit, ex
   assert.ok($(ctx, '.mlv-sheet') && !$(ctx, '.mlv-sheet').hidden, 'the shortcut sheet opens');
   // Every item names itself; the exports are the whole diagram, and nothing else is offered.
   assert.deepEqual($$(ctx, '.mlv-moremenu__item').map((item) => item.querySelector('.mlv-moremenu__label').textContent), [
-    'Search steps and findings', 'About revision r7 · claude-code', '3 not observed (1 step, 1 connection, 1 finding)', 'Legend', 'Connection flow animation', 'Overview map', 'Side panel',
+    'Search steps and findings', 'About revision r7 · claude-code', '3 not observed (1 step, 1 connection, 1 finding)', 'Review the claims', 'Legend', 'Connection flow animation', 'Overview map', 'Side panel',
     'Fit the whole diagram', 'Zoom to the selection', 'Export SVG…', 'Export PNG…', 'Copy SVG', 'Keyboard shortcuts',
   ]);
   assert.equal($(ctx, '[data-more-item="zoomsel"]').disabled, true, 'nothing selected, nothing to zoom to');
@@ -402,10 +405,12 @@ test('the shortcut sheet lists the find key and no scope keys', async () => {
   // Viewer M2 live fix: the find key for the platform (jsdom is not macOS) and `/`; no K.
   assert.ok(keys.includes('Ctrl+F /'), keys.join(' | '));
   assert.equal(keys.some((k) => /K$|K /.test(k)), false, 'no Ctrl+K or Cmd+K');
-  assert.equal(keys.some((k) => /^s Shift\+S$|^\[ \]$/.test(k)), false, 'the scope keys are gone');
+  assert.equal(keys.some((k) => /^s Shift\+S$/.test(k)), false, 'the scope keys are gone');
+  // Viewer M3: [ and ] came back for the review walk's quotes, not for a scope.
+  assert.deepEqual(rows.filter((row) => row[0] === '[ ]').map((row) => row[1]), ['In the review walk: previous / next quote of the claim']);
   const sheet = $(ctx, '.mlv-sheet').textContent;
   assert.doesNotMatch(sheet, /scope/i);
-  assert.match(sheet, /Close the menu, this sheet, the Refine popover or the legend, collapse the bottom panel/);
+  assert.match(sheet, /Close the menu, this sheet, the Refine popover or the legend, end the review walk, collapse the bottom panel/);
   assert.match(sheet, /About \/ Findings \/ Selection \/ Outline/);
   ctx.app.destroy();
 });
diff --git a/webview/test/m2-review.test.mjs b/webview/test/m2-review.test.mjs
index 5504eb52..abf70d95 100644
--- a/webview/test/m2-review.test.mjs
+++ b/webview/test/m2-review.test.mjs
@@ -221,6 +221,8 @@ function emulateRow(ctx) {
     add('.mlv-chip--sev', 44);
     add('.mlv-header__unit', 50);
     add('.mlv-chip--exceptions', 150);
+    // Viewer M3: the Review button (an icon and a word), shown from 620 px until the row folds.
+    add('.mlv-header__review', 78);
     add('.mlv-btn--more', 26);
     add('.mlv-workflow__refine', 70, 0);
     return total;
diff --git a/webview/test/walk.test.mjs b/webview/test/walk.test.mjs
new file mode 100644
index 00000000..b9ed0a0d
--- /dev/null
+++ b/webview/test/walk.test.mjs
@@ -0,0 +1,841 @@
+// Viewer M3, roadmap step 11: the claim-by-claim review walk, webview side.
+//
+// The fixtures are SYNTHETIC: generated documents with the shapes of the two public shakedown
+// artifacts the design was measured on (vit-cc: 6 phases, 31 steps in two groups, 41 connections,
+// 7 findings, 7 claims not observed; yolov5-cc2: 4 phases, 59 steps in two groups, 113
+// connections, 4 findings, 16 claims not observed, two steps without quotes), plus small
+// hand-made documents for the order rules. No third-party text is used. The shipped stylesheet is
+// injected into jsdom; jsdom lays nothing out, so the panel width is a stubbed
+// `getBoundingClientRect`, and the host is the test's recording bridge, which answers the walk's
+// opens by hand. None of this is a live VS Code check, a usability check or a semantic review.
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import { join } from 'node:path';
+import { loadBundle, recordingBridge, WEBVIEW_ROOT } from './helpers.mjs';
+
+const CSS = await readFile(join(WEBVIEW_ROOT, 'dist', 'mlview.css'), 'utf8');
+const sleep = (ms) => new Promise((done) => setTimeout(done, ms));
+/** Values from the page's realm compared by content (their prototypes are the page's). */
+const plain = (value) => (value === undefined ? undefined : JSON.parse(JSON.stringify(value)));
+const eq = (actual, expected, message) => (message === undefined ? assert.deepEqual(plain(actual), plain(expected)) : assert.deepEqual(plain(actual), plain(expected), message));
+
+/* ── synthetic documents ─────────────────────────────────────────────── */
+
+function lcg(seed) {
+  let s = seed >>> 0;
+  return () => {
+    s = (Math.imul(s, 1664525) + 1013904223) >>> 0;
+    return s / 4294967296;
+  };
+}
+
+/**
+ * A document with a given shape: phases, steps (some in groups, listed out of phase order),
+ * connections, findings citing several steps (in several phases) or connections, a number of
+ * inferred or unresolved claims of each kind, steps without quotes, and notebook-cell quotes.
+ */
+function shapedWorkflow(spec) {
+  const rand = lcg(spec.seed);
+  const pick = (n) => Math.floor(rand() * n);
+  const phases = Array.from({ length: spec.phases }, (_, i) => ({ id: 'p' + i, label: 'Phase ' + i }));
+  const phaseOf = (i) => 'p' + Math.min(spec.phases - 1, Math.floor((i * spec.phases) / spec.nodes));
+  const nodes = Array.from({ length: spec.nodes }, (_, i) => ({ id: 'n' + i, label: 'Step ' + i, phase: phaseOf(i), kind: 'operation', basis: 'observed', evidence: [] }));
+  // Groups: a group step and its children, all in the group's phase.
+  for (const [g, size] of spec.groups.entries()) {
+    const phase = 'p' + (g % spec.phases);
+    const members = nodes.filter((n) => n.phase === phase).slice(0, size + 1);
+    assert.ok(members.length === size + 1, 'phase ' + phase + ' has room for a group of ' + size);
+    const [head, ...children] = members;
+    head.kind = 'group';
+    for (const child of children) child.parent = head.id;
+  }
+  const evidence = [];
+  const cite = (count) => {
+    const ids = [];
+    for (let k = 0; k < count; k++) {
+      const id = 'ev' + evidence.length;
+      const notebook = rand() < spec.notebookShare;
+      const line = 1 + pick(40);
+      evidence.push(notebook
+        ? { id, file: 'notes.ipynb', cell: pick(30), line: 1 + pick(5), endLine: 1 + pick(5) + 5, quote: 'cell_code_' + id + '()' }
+        : { id, file: 'src/file' + pick(4) + '.py', line, endLine: line + pick(3), quote: 'code_' + id + '()' });
+      ids.push(id);
+    }
+    return ids;
+  };
+  const steps = nodes.slice();
+  for (let i = 0; i < spec.notObserved.steps; i++) steps[(i * 7 + 3) % steps.length].basis = i % 2 ? 'unresolved' : 'inferred';
+  let empty = spec.emptyEvidence;
+  for (const node of nodes) {
+    // A step without quotes is either a group head or unresolved (the contract's only two cases).
+    if (empty > 0 && (node.kind === 'group' || node.basis === 'unresolved')) {
+      empty--;
+      continue;
+    }
+    node.evidence = cite(1 + pick(spec.maxEvidence));
+  }
+  assert.equal(empty, 0, 'the fixture places every step without quotes');
+  const edges = [];
+  for (let i = 0; i < spec.edges; i++) {
+    let source = pick(spec.nodes);
+    let target = pick(spec.nodes);
+    if (target === source) target = (source + 1) % spec.nodes;
+    edges.push({ id: 'c' + i, source: 'n' + source, target: 'n' + target, label: 'flow ' + i, kind: i % 5 ? 'data' : 'control', basis: 'observed', evidence: cite(1 + pick(spec.maxEvidence)) });
+  }
+  for (let i = 0; i < spec.notObserved.connections; i++) edges[(i * 11 + 2) % edges.length].basis = i % 3 ? 'inferred' : 'unresolved';
+  const severities = ['high', 'medium', 'low'];
+  const findings = spec.findings.map((f, i) => {
+    const nodeIds = [];
+    while (nodeIds.length < f.nodes) {
+      const id = 'n' + pick(spec.nodes);
+      if (!nodeIds.includes(id)) nodeIds.push(id);
+    }
+    const edgeIds = [];
+    while (edgeIds.length < (f.edges || 0)) {
+      const id = 'c' + pick(spec.edges);
+      if (!edgeIds.includes(id)) edgeIds.push(id);
+    }
+    return { id: 'f' + i, title: 'Finding ' + i, message: 'Synthetic finding ' + i + '.', severity: severities[i % 3], nodeIds, edgeIds,
+      basis: i < spec.notObserved.findings ? 'inferred' : 'observed', evidence: cite(1) };
+  });
+  // Document order is not drawn order: list the steps rotated, so later phases come first.
+  const rotated = nodes.slice(Math.floor(spec.nodes / 3)).concat(nodes.slice(0, Math.floor(spec.nodes / 3)));
+  return {
+    workflowVersion: '1.0', title: spec.title, producer: { kind: 'host-llm', host: 'claude-code', model: 'synthetic' },
+    revision: { id: spec.revision || 'syn-r1' },
+    request: { question: 'How is the model trained?', scope: 'src/' },
+    phases, nodes: rotated, edges, findings, evidence,
+    coverage: { status: 'scoped', summary: 'Synthetic coverage.', inspectedFiles: ['notes.ipynb', 'src/file0.py'], limitations: [] },
+  };
+}
+
+/** The vit-cc shape: 79 claims = 31 + 41 + 7, of which 7 are not observed (0 + 3 + 4). */
+const VIT_SHAPE = {
+  seed: 7, title: 'Synthetic: the vit-cc shape', phases: 6, nodes: 31, groups: [4, 4], edges: 41,
+  findings: [{ nodes: 3 }, { nodes: 3 }, { nodes: 3 }, { nodes: 1 }, { nodes: 3 }, { nodes: 2 }, { nodes: 3 }],
+  notObserved: { steps: 0, connections: 3, findings: 4 }, emptyEvidence: 0, notebookShare: 0.84, maxEvidence: 2,
+};
+/** The yolov5-cc2 shape: 176 claims = 59 + 113 + 4, of which 16 are not observed (4 + 10 + 2). */
+const YOLO_SHAPE = {
+  seed: 5, title: 'Synthetic: the yolov5-cc2 shape', phases: 4, nodes: 59, groups: [12, 8], edges: 113,
+  findings: [{ nodes: 5 }, { nodes: 2, edges: 1 }, { nodes: 2 }, { nodes: 1 }],
+  notObserved: { steps: 4, connections: 10, findings: 2 }, emptyEvidence: 2, notebookShare: 0, maxEvidence: 12,
+};
+
+/** A small document for the order rules, with groups, a cross-phase parent and homeless findings. */
+function orderDoc() {
+  const ev = (id, file = 'train.py', line = 1) => ({ id, file, line, endLine: line + 1, quote: 'x()' });
+  return {
+    workflowVersion: '1.0', title: 'Order rules', producer: { kind: 'host-llm', host: 'codex', model: 'm' }, revision: { id: 'o1' },
+    request: { question: 'q', scope: 's' },
+    phases: [{ id: 'data', label: 'Data' }, { id: 'fit', label: 'Fit' }],
+    nodes: [
+      // Listed fit-first: drawn order still starts with the Data lane.
+      { id: 'loop', label: 'Epoch loop', phase: 'fit', kind: 'group', basis: 'observed', evidence: [] },
+      { id: 'step', label: 'Optimizer step', phase: 'fit', parent: 'loop', basis: 'inferred', evidence: ['e3', 'e4'] },
+      { id: 'load', label: 'Load batches', phase: 'data', basis: 'observed', evidence: ['e1'] },
+      { id: 'aug', label: 'Augment', phase: 'data', basis: 'observed', evidence: ['e2'] },
+      // A parent in another phase: drawn as a root of its own lane, after the lane's other roots.
+      { id: 'sched', label: 'LR schedule', phase: 'data', parent: 'loop', basis: 'unresolved', evidence: [] },
+      { id: 'zero', label: 'Zero grads', phase: 'fit', parent: 'loop', basis: 'observed', evidence: ['e5'] },
+    ],
+    edges: [
+      { id: 'c-step-zero', source: 'step', target: 'zero', label: 'then', basis: 'observed', evidence: ['e4'] },
+      { id: 'c-load-aug', source: 'load', target: 'aug', label: 'images', basis: 'observed', evidence: ['e1'] },
+      { id: 'c-aug-step', source: 'aug', target: 'step', label: 'batches', basis: 'inferred', evidence: ['e2', 'e3'] },
+      { id: 'c-load-step', source: 'load', target: 'step', label: 'labels', basis: 'observed', evidence: ['e1'] },
+    ],
+    findings: [
+      { id: 'f-whole', title: 'No seed', message: 'm', severity: 'low', nodeIds: [], basis: 'observed', evidence: ['e1'] },
+      // Cites zero then aug: its first cited step in DRAWN order is aug (Data lane), not zero.
+      { id: 'f-two', title: 'Order risk', message: 'm', severity: 'high', nodeIds: ['zero', 'aug'], basis: 'inferred', evidence: ['e5'], counterEvidence: ['e2'] },
+      { id: 'f-edge', title: 'Cast on batches', message: 'm', severity: 'medium', nodeIds: [], edgeIds: ['c-aug-step'], basis: 'unresolved', evidence: ['e2'] },
+      { id: 'f-step', title: 'Clip missing', message: 'm', severity: 'medium', nodeIds: ['step'], basis: 'observed', evidence: ['e3'] },
+    ],
+    evidence: [ev('e1', 'data.py', 3), ev('e2', 'data.py', 9), ev('e3', 'train.py', 4), ev('e4', 'train.py', 8), ev('e5', 'nb.ipynb', 2)].map((e) => (e.file === 'nb.ipynb' ? { ...e, cell: 7 } : e)),
+    coverage: { status: 'scoped', summary: 's', inspectedFiles: ['data.py', 'train.py'], limitations: ['Launcher not read.'] },
+  };
+}
+
+/* ── mounting ────────────────────────────────────────────────────────── */
+
+async function mount(document, opts = {}) {
+  const ctx = await loadBundle();
+  const style = ctx.document.createElement('style');
+  style.textContent = CSS;
+  ctx.document.head.appendChild(style);
+  if (opts.bodyClass) ctx.document.body.classList.add(opts.bodyClass);
+  const root = ctx.document.getElementById('mlview-root');
+  let width = opts.width || 0;
+  root.getBoundingClientRect = () => ({ x: 0, y: 0, top: 0, left: 0, width, height: 798, right: width, bottom: 798 });
+  const bridge = recordingBridge(ctx.window, 'vscode', { ...(opts.state ? { state: opts.state } : {}), ...(opts.capabilities ? { capabilities: opts.capabilities } : {}) });
+  const app = ctx.MLView.mountWorkflow(root, document, bridge);
+  const resize = (next) => {
+    width = next;
+    ctx.window.dispatchEvent(new ctx.window.Event('resize'));
+  };
+  const canvas = ctx.document.querySelector('.mlv-canvas');
+  canvas.focus();
+  return { ...ctx, root, bridge, app, resize, canvas };
+}
+
+const $ = (ctx, selector) => ctx.document.querySelector(selector);
+const $$ = (ctx, selector) => Array.from(ctx.document.querySelectorAll(selector));
+const press = (ctx, key, init = {}, target = ctx.document.activeElement || ctx.canvas) => {
+  const ev = new ctx.window.KeyboardEvent('keydown', { key, bubbles: true, cancelable: true, ...init });
+  target.dispatchEvent(ev);
+  return ev;
+};
+const live = (ctx) => $(ctx, '.mlv-root > [aria-live]').textContent;
+const opens = (ctx) => ctx.bridge.posted.filter((m) => m.type === 'openLocation');
+const walkFrames = (ctx) => ctx.bridge.posted.filter((m) => m.type === 'walk');
+const answer = (ctx, frame, outcome, extra = {}) =>
+  ctx.bridge.send({ v: 1, type: 'actionResult', requestId: frame.requestId, action: 'openLocation', outcome, seq: frame.seq, ...extra });
+const key = (claim) => claim.kind + ':' + claim.id;
+/** Press `k` (or `j`) until the walk is on claim `id` (at most 20 presses, so a regression fails, never hangs). */
+function walkTo(ctx, id, k) {
+  for (let i = 0; i < 20 && (!ctx.app.walk.current() || ctx.app.walk.current().id !== id); i++) press(ctx, k);
+  assert.equal(ctx.app.walk.current() && ctx.app.walk.current().id, id, 'the walk reached ' + id);
+}
+
+function visible(ctx, element) {
+  if (!element) return false;
+  for (let node = element; node && node.nodeType === 1; node = node.parentElement) {
+    if (node.hidden) return false;
+    const style = ctx.window.getComputedStyle(node);
+    if (style.display === 'none' || style.visibility === 'hidden') return false;
+  }
+  return true;
+}
+
+/* ── the order: every claim exactly once ─────────────────────────────── */
+
+for (const [name, shape, totals] of [
+  ['vit-cc', VIT_SHAPE, { steps: 31, connections: 41, findings: 7, all: 79, notObserved: 7 }],
+  ['yolov5-cc2', YOLO_SHAPE, { steps: 59, connections: 113, findings: 4, all: 176, notObserved: 16 }],
+]) {
+  test(`the ${name} shape: the walk visits all ${totals.all} claims (${totals.steps}+${totals.connections}+${totals.findings}) exactly once, each step before its connections and findings`, async () => {
+    const document = shapedWorkflow(shape);
+    const ctx = await mount(document, { width: 1440 });
+    try {
+      const order = ctx.app.walk.claims();
+      assert.equal(order.length, totals.all);
+      assert.equal(new Set(order.map(key)).size, totals.all, 'no claim twice');
+      for (const node of document.nodes) assert.equal(order.filter((c) => key(c) === 'node:' + node.id).length, 1, node.id);
+      for (const edge of document.edges) assert.equal(order.filter((c) => key(c) === 'edge:' + edge.id).length, 1, edge.id);
+      for (const finding of document.findings) assert.equal(order.filter((c) => key(c) === 'issue:' + finding.id).length, 1, finding.id);
+      // Steps in drawn order: lanes in phase order, each lane as the Outline lists it.
+      const outline = $$(ctx, '.mlv-rail__tab[data-tab="outline"]')[0];
+      outline.click();
+      const outlineSteps = $$(ctx, '[data-outline-id]').map((row) => row.getAttribute('data-outline-id'));
+      eq(order.filter((c) => c.kind === 'node').map((c) => c.id), outlineSteps, 'steps in the Outline\'s (drawn) order');
+      const phaseRank = new Map(document.phases.map((p, i) => [p.id, i]));
+      const stepPhases = order.filter((c) => c.kind === 'node').map((c) => phaseRank.get(document.nodes.find((n) => n.id === c.id).phase));
+      eq(stepPhases, stepPhases.slice().sort((a, b) => a - b), 'lanes in phase order');
+      // Each connection right after its source step's block; each finding after its first cited step.
+      const stepRank = new Map(order.filter((c) => c.kind === 'node').map((c, i) => [c.id, i]));
+      let current = null;
+      for (const claim of order) {
+        if (claim.kind === 'node') current = claim.id;
+        else if (claim.kind === 'edge') assert.equal(document.edges.find((e) => e.id === claim.id).source, current, claim.id + ' follows its source');
+        else {
+          const cited = document.findings.find((f) => f.id === claim.id).nodeIds.slice().sort((a, b) => stepRank.get(a) - stepRank.get(b));
+          assert.equal(cited[0], current, claim.id + ' follows its first cited step');
+        }
+      }
+    } finally {
+      ctx.app.destroy();
+    }
+  });
+
+  test(`the ${name} shape: each filter's count equals the header's count with its unit (Not observed ${totals.notObserved})`, async () => {
+    const ctx = await mount(shapedWorkflow(shape), { width: 1440 });
+    try {
+      const chip = $(ctx, '.mlv-chip--exceptions');
+      const headerNotObserved = Number(/^(\d+) not observed/.exec(chip.getAttribute('aria-label'))[1]);
+      assert.equal(headerNotObserved, totals.notObserved);
+      const severityTotal = $$(ctx, '.mlv-chip--sev .mlv-chip__count').reduce((sum, el) => sum + Number(el.textContent), 0);
+      const status = $(ctx, '.mlv-status__counts').textContent;
+      assert.equal(status, `${totals.steps} steps · ${totals.connections} connections`);
+      press(ctx, 'r');
+      const count = (filter) => Number($(ctx, `.mlv-walkbar__filter[data-walk-filter="${filter}"] .mlv-walkbar__fcount`).textContent);
+      assert.equal(count('notObserved'), headerNotObserved, 'Not observed = the header chip');
+      assert.equal(count('findings'), severityTotal, 'Findings = the severity toggles\' findings');
+      assert.equal(count('all'), totals.steps + totals.connections + severityTotal, 'All = steps + connections + findings');
+      assert.equal($(ctx, '.mlv-walkbar__filter[data-walk-filter="changed"]').hidden, true, 'no Changed files without stale files');
+      // The default filter is Not observed, and the bar says so with the count.
+      assert.equal($(ctx, '.mlv-walkbar__postext').textContent, `Claim 1 of ${totals.notObserved} · Not observed`);
+      assert.equal($(ctx, '.mlv-walkbar__filter[aria-pressed="true"]').getAttribute('data-walk-filter'), 'notObserved');
+      // Stepping through the whole filter visits each not-observed claim once.
+      const seen = [];
+      for (let i = 0; i < totals.notObserved; i++) {
+        seen.push(key(ctx.app.walk.current()));
+        press(ctx, 'j');
+      }
+      assert.equal(new Set(seen).size, totals.notObserved);
+      assert.match(live(ctx), new RegExp(`^Claim ${totals.notObserved} of ${totals.notObserved} is the last one\\.$`));
+    } finally {
+      ctx.app.destroy();
+    }
+  });
+}
+
+test('order rules: lanes in phase order, a group before its steps, a step before its connections and the findings it hosts; findings with no cited step last', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    eq(ctx.app.walk.claims().map(key), [
+      // Data lane: load, aug, then sched (its parent is in Fit, so it is a root of Data).
+      'node:load', 'edge:c-load-aug', 'edge:c-load-step',
+      'node:aug', 'edge:c-aug-step', 'issue:f-two',
+      'node:sched',
+      // Fit lane: the group, then its steps.
+      'node:loop', 'node:step', 'edge:c-step-zero', 'issue:f-step', 'node:zero',
+      // No cited step: the connection-only finding and the whole-workflow one, in document order.
+      'issue:f-whole', 'issue:f-edge',
+    ]);
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+/* ── the keys ────────────────────────────────────────────────────────── */
+
+test('r starts the walk on Not observed and ends it; the header Review button and the ⋯ item do the same', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    const bar = $(ctx, '.mlv-walkbar');
+    const review = $(ctx, '.mlv-header__review');
+    assert.equal(bar.hidden, true, 'no bar before the walk');
+    assert.ok(visible(ctx, review), 'Review is on the header row');
+    assert.equal(review.getAttribute('aria-pressed'), 'false');
+    assert.equal(press(ctx, 'r').defaultPrevented, true);
+    assert.equal(ctx.app.walk.active, true);
+    assert.equal(bar.hidden, false);
+    assert.equal(review.getAttribute('aria-pressed'), 'true');
+    // The not-observed claims, in the drawn order.
+    eq(ctx.app.walk.list.map(key), ['edge:c-aug-step', 'issue:f-two', 'node:sched', 'node:step', 'issue:f-edge']);
+    eq(ctx.app.selection, ctx.app.walk.current(), 'the first claim is selected');
+    assert.equal(ctx.app.getState().railTab, 'inspector', 'and shown in the Selection tab');
+    press(ctx, 'r');
+    assert.equal(ctx.app.walk.active, false);
+    assert.equal(bar.hidden, true);
+    eq(walkFrames(ctx).at(-1), { v: 1, type: 'walk', state: 'end' }, 'the host is told the walk ended');
+    review.click();
+    assert.equal(ctx.app.walk.active, true, 'the Review button starts it');
+    review.click();
+    assert.equal(ctx.app.walk.active, false, 'and ends it');
+    $(ctx, '.mlv-btn--more').click();
+    const item = $(ctx, '[data-more-item="review"]');
+    assert.ok(visible(ctx, item));
+    assert.equal(item.querySelector('.mlv-moremenu__label').textContent, 'Review the claims');
+    assert.equal(item.querySelector('.mlv-moremenu__keys').textContent, 'R');
+    item.click();
+    assert.equal(ctx.app.walk.active, true, 'the ⋯ item starts it');
+    $(ctx, '.mlv-btn--more').click();
+    assert.equal($(ctx, '[data-more-item="review"] .mlv-moremenu__label').textContent, 'End the review');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('j / k and ↓ / ↑ step while walking; outside the walk the arrows move spatially and j, k, [ and ] are left alone', async () => {
+  const ctx = await mount(shapedWorkflow(VIT_SHAPE), { width: 1440 });
+  try {
+    ctx.app.select({ kind: 'node', id: ctx.app.walk.claims()[0].id });
+    ctx.canvas.focus();
+    for (const k of ['j', 'k', '[', ']']) assert.equal(press(ctx, k).defaultPrevented, false, k + ' is not consumed outside the walk');
+    let before = ctx.app.selection.id;
+    assert.equal(press(ctx, 'ArrowRight').defaultPrevented, true);
+    assert.notEqual(ctx.app.selection.id, before, 'ArrowRight moved the selection spatially');
+    before = ctx.app.selection.id;
+    assert.equal(press(ctx, 'ArrowDown').defaultPrevented, true);
+    assert.notEqual(ctx.app.selection.id, before, 'ArrowDown moved the selection spatially');
+    ctx.canvas.focus();
+    press(ctx, 'r');
+    ctx.app.walk.setFilter('all');
+    const at = () => ctx.app.walk.position;
+    const start = at();
+    press(ctx, 'j');
+    assert.equal(at(), start + 1);
+    press(ctx, 'ArrowDown');
+    assert.equal(at(), start + 2);
+    press(ctx, 'k');
+    press(ctx, 'ArrowUp');
+    assert.equal(at(), start);
+    eq(ctx.app.selection, ctx.app.walk.current(), 'each step selects its claim');
+    // ← and → keep their spatial meaning during the walk; the walk follows a claim it holds.
+    ctx.app.walk.setFilter('all');
+    press(ctx, 'ArrowRight');
+    eq(ctx.app.walk.current(), ctx.app.selection, 'the walk followed the spatial move');
+    // No Ctrl/Cmd chord is answered by the walk.
+    for (const init of [{ ctrlKey: true }, { metaKey: true }]) {
+      for (const k of ['j', 'k', 'r', 'u', '[', ']']) assert.equal(press(ctx, k, init).defaultPrevented, false, k + ' with a modifier goes to VS Code');
+    }
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('[ and ] step through the claim\'s quotes; Enter opens the current quote again at once', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    press(ctx, 'r');
+    // The first not-observed claim is the connection Augment → Optimizer step, with two quotes.
+    eq(ctx.app.walk.current(), { kind: 'edge', id: 'c-aug-step' });
+    ctx.app.walk.flushOpen();
+    assert.equal(opens(ctx).at(-1).evidenceId, 'e2');
+    const scrolled = [];
+    ctx.window.HTMLElement.prototype.scrollIntoView = function (options) { scrolled.push([this, options]); };
+    press(ctx, ']');
+    assert.equal(live(ctx), 'Quote 2 of 2: train.py · lines 4–5.');
+    // The pane's mark moves to the second quote at once and is scrolled into view (least distance).
+    const marked = $(ctx, '.mlv-quote.is-walk');
+    assert.equal(marked, $$(ctx, '.mlv-sel .mlv-insp__source-evidence > .mlv-quote')[1]);
+    eq(scrolled.map(([element, options]) => [element === marked, options]), [[true, { block: 'nearest' }]]);
+    assert.equal($(ctx, '.mlv-walkbar__editor').getAttribute('data-walk-status'), 'opening');
+    assert.equal(ctx.app.walk.pendingOpen, true, 'the quote opens after the same pause as a step');
+    ctx.app.walk.flushOpen();
+    assert.equal(opens(ctx).at(-1).evidenceId, 'e3');
+    assert.equal(press(ctx, ']').defaultPrevented, true);
+    assert.equal(live(ctx), 'Quote 2 of 2 is the last one.');
+    press(ctx, '[');
+    ctx.app.walk.flushOpen();
+    assert.equal(opens(ctx).at(-1).evidenceId, 'e2');
+    const count = opens(ctx).length;
+    assert.equal(press(ctx, 'Enter').defaultPrevented, true);
+    assert.equal(opens(ctx).length, count + 1, 'Enter opens at once, without the pause');
+    const last = opens(ctx).at(-1);
+    assert.equal(last.evidenceId, 'e2');
+    assert.equal(last.walk, true);
+    assert.equal(last.focus, undefined, 'focus stays here');
+    press(ctx, 'Enter', { altKey: true });
+    assert.equal(opens(ctx).at(-1).focus, true, 'Alt+Enter moves focus to the editor');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('u starts the walk on Not observed and steps through it (Shift+U back); n / p walk the findings in the walk', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    // Outside the walk, n is the M2 findings walk (document order) and starts nothing.
+    press(ctx, 'n');
+    assert.equal(ctx.app.walk.active, false);
+    eq(ctx.app.selection, { kind: 'issue', id: 'f-whole' });
+    ctx.canvas.focus();
+    press(ctx, 'u');
+    assert.equal(ctx.app.walk.active, true);
+    assert.equal(ctx.app.walk.filter, 'notObserved');
+    eq(ctx.app.walk.current(), { kind: 'edge', id: 'c-aug-step' });
+    press(ctx, 'u');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-two' }, 'u: the next not-observed claim in the drawn order');
+    press(ctx, 'U', { shiftKey: true });
+    eq(ctx.app.walk.current(), { kind: 'edge', id: 'c-aug-step' }, 'Shift+U: the previous one');
+    // On All, u keeps the filter and jumps to the next not-observed claim.
+    ctx.app.walk.setFilter('all');
+    press(ctx, 'u');
+    assert.equal(ctx.app.walk.filter, 'all');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-two' });
+    // In the walk, n and p go to the next and previous finding in the walk's (drawn) order.
+    press(ctx, 'n');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-step' }, 'the next finding after F2');
+    press(ctx, 'n');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-whole' }, 'then the findings without a cited step, at the end');
+    press(ctx, 'p');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-step' });
+    // Not observed holds no F4: the walk moves to the next claim it holds, the F3 at the end.
+    ctx.app.walk.setFilter('notObserved');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-edge' });
+    // n wraps to F2, which Not observed holds; the next, F4, is observed: the filter becomes Findings.
+    press(ctx, 'n');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-two' });
+    assert.equal(ctx.app.walk.filter, 'notObserved');
+    press(ctx, 'n');
+    eq(ctx.app.walk.current(), { kind: 'issue', id: 'f-step' });
+    assert.equal(ctx.app.walk.filter, 'findings');
+    assert.equal($(ctx, '.mlv-walkbar__filter[aria-pressed="true"]').getAttribute('data-walk-filter'), 'findings');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+/* ── each step ───────────────────────────────────────────────────────── */
+
+test('each step asks the host after a pause, numbered; a burst of steps sends one open; only the latest answer is shown', async () => {
+  const ctx = await mount(shapedWorkflow(YOLO_SHAPE), { width: 1440 });
+  try {
+    press(ctx, 'r');
+    ctx.app.walk.setFilter('all');
+    const before = opens(ctx).length;
+    for (let i = 0; i < 6; i++) press(ctx, 'j');
+    assert.equal(opens(ctx).length, before, 'nothing is asked while the reader keeps moving');
+    assert.equal(ctx.app.walk.pendingOpen, true);
+    await sleep(220);
+    assert.equal(opens(ctx).length, before + 1, 'one open after the pause');
+    const first = opens(ctx).at(-1);
+    assert.equal(first.walk, true);
+    assert.ok(Number.isInteger(first.seq) && first.seq > 0);
+    assert.match(first.requestId, /^[A-Za-z0-9_-]{1,64}$/);
+    assert.equal(first.preview, true);
+    assert.equal($(ctx, '.mlv-walkbar__editor').getAttribute('data-walk-status'), 'opening');
+    assert.match($(ctx, '.mlv-walkbar__editortext').textContent, /^Opening in the editor beside: /);
+    press(ctx, 'j');
+    ctx.app.walk.flushOpen();
+    const second = opens(ctx).at(-1);
+    assert.ok(second.seq > first.seq, 'the number rises with every open');
+    // The first open's late answer changes nothing; the second's is shown.
+    answer(ctx, first, 'blocked', { reason: 'changed', message: 'stale; not opened.' });
+    assert.equal($(ctx, '.mlv-walkbar__editor').getAttribute('data-walk-status'), 'opening');
+    answer(ctx, second, 'done');
+    assert.equal($(ctx, '.mlv-walkbar__editor').getAttribute('data-walk-status'), 'done');
+    const where = $(ctx, '.mlv-walkbar__editortext').textContent;
+    assert.match(where, /^In the editor beside: src\/file\d\.py · lines? \d+(–\d+)?( \(quote 1 of \d+\))?, highlighted\. Focus stays here\.$/);
+    // The pane marks the quote the editor shows.
+    const mark = $(ctx, '.mlv-quote.is-walk');
+    assert.ok(mark, 'the walk\'s quote is marked in the Selection pane');
+    assert.equal(mark.getAttribute('data-walk-status'), 'done');
+    assert.equal(mark.querySelector('.mlv-quote__walk').textContent, 'In the editor beside, highlighted.');
+    // The focus stayed on the diagram the whole time.
+    assert.equal(ctx.document.activeElement, ctx.canvas);
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('a blocked result shows its reason in the bar and the pane and is announced; nothing is opened and nothing is toasted', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    press(ctx, 'r');
+    ctx.app.walk.flushOpen();
+    const frame = opens(ctx).at(-1);
+    answer(ctx, frame, 'blocked', { reason: 'unsaved', message: 'Unsaved changes in data.py no longer contain the cited lines; not opened. Save or revert the file.' });
+    const editor = $(ctx, '.mlv-walkbar__editor');
+    assert.equal(editor.getAttribute('data-walk-status'), 'blocked');
+    assert.match($(ctx, '.mlv-walkbar__editortext').textContent, /^Quote 1 of 2: Unsaved changes in data\.py no longer contain the cited lines; not opened\./);
+    assert.ok(visible(ctx, $(ctx, '.mlv-walkbar__editoricon')), 'a warning mark with the words');
+    const mark = $(ctx, '.mlv-quote.is-walk');
+    assert.equal(mark.getAttribute('data-walk-status'), 'blocked');
+    assert.match(mark.querySelector('.mlv-quote__walk').textContent, /no longer contain the cited lines; not opened/);
+    assert.match(live(ctx), /^Not opened: Unsaved changes in data\.py/);
+    assert.equal($$(ctx, '.mlv-toast').length, 0, 'no toast');
+    // A file the host already reported stale is said at once, and still asked for (the host never
+    // opens it, and clears the earlier claim's highlight).
+    ctx.bridge.send({ v: 1, type: 'stale', files: [{ path: 'data.py', reason: 'changed' }] });
+    ctx.app.walk.setFilter('all');
+    walkTo(ctx, 'load', 'k');
+    assert.equal(editor.getAttribute('data-walk-status'), 'blocked');
+    assert.equal($(ctx, '.mlv-walkbar__editortext').textContent, 'data.py: changed since publishing; not opened.');
+    ctx.app.walk.flushOpen();
+    assert.equal(opens(ctx).at(-1).evidenceId, 'e1', 'the walk still asks, so the host can clear the highlight');
+    assert.equal($$(ctx, '.mlv-toast').length, 0, 'still no toast');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('a claim with no quotes opens nothing, says so, and tells the host to clear the highlight', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    press(ctx, 'r');
+    walkTo(ctx, 'sched', 'j');
+    assert.equal($(ctx, '.mlv-walkbar__editortext').textContent, 'This claim cites no lines, so nothing is opened for it.');
+    const frames = walkFrames(ctx).length;
+    ctx.app.walk.flushOpen();
+    eq(walkFrames(ctx).slice(frames), [{ v: 1, type: 'walk', state: 'clear' }]);
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('the live region announces the place, the filter, the kind, the title and an exception\'s basis', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    press(ctx, 'r');
+    assert.equal(live(ctx), 'Claim 1 of 5, not observed: Connection batches, from Augment to Optimizer step, inferred.');
+    press(ctx, 'j');
+    assert.equal(live(ctx), 'Claim 2 of 5, not observed: Finding F2 Order risk, inferred.');
+    press(ctx, 'j');
+    assert.equal(live(ctx), 'Claim 3 of 5, not observed: Step LR schedule, unresolved.');
+    ctx.app.walk.setFilter('all');
+    assert.equal(live(ctx), 'All: 14 claims. Claim 7 of 14: Step LR schedule, unresolved.');
+    for (let i = 0; i < 3; i++) press(ctx, 'k');
+    assert.equal(live(ctx), 'Claim 4 of 14: Step Augment.', 'no basis word for an observed claim, no filter word for All');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+/* ── Escape, Tab and the place ───────────────────────────────────────── */
+
+test('Escape ends the walk at once, before the bottom sheet collapses, from the canvas, the bar, the header and the sheet', async () => {
+  const ctx = await mount(orderDoc(), { width: 541 });
+  try {
+    press(ctx, 'r');
+    assert.equal($(ctx, '.mlv-rail').getAttribute('data-expanded'), 'true', 'the step opened the bottom sheet');
+    let ev = press(ctx, 'Escape');
+    assert.equal(ev.defaultPrevented, true);
+    assert.equal(ctx.app.walk.active, false, 'one Escape ends the walk');
+    assert.equal($(ctx, '.mlv-rail').getAttribute('data-expanded'), 'true', 'the sheet stays open on the claim');
+    assert.ok(ctx.app.selection, 'and the claim stays selected');
+    eq(walkFrames(ctx).at(-1), { v: 1, type: 'walk', state: 'end' });
+    // From the bar: Escape ends it and gives the focus back to the diagram.
+    press(ctx, 'r');
+    ctx.app.walkBar.focus();
+    assert.ok($(ctx, '.mlv-walkbar').contains(ctx.document.activeElement));
+    press(ctx, 'Escape');
+    assert.equal(ctx.app.walk.active, false);
+    assert.equal(ctx.document.activeElement, ctx.canvas);
+    // From the header's toolbar.
+    press(ctx, 'r');
+    $(ctx, '.mlv-btn--more').focus();
+    ev = press(ctx, 'Escape');
+    assert.equal(ctx.app.walk.active, false);
+    assert.equal(ev.defaultPrevented, true, 'marked handled, so VS Code does not also act on it');
+    // From inside the open sheet: the walk ends; the sheet collapses only on the next Escape.
+    ctx.canvas.focus();
+    press(ctx, 'r');
+    const tab = $(ctx, '.mlv-rail__tab[aria-selected="true"]');
+    tab.focus();
+    press(ctx, 'Escape');
+    assert.equal(ctx.app.walk.active, false);
+    assert.equal($(ctx, '.mlv-rail').getAttribute('data-expanded'), 'true');
+    assert.equal(ctx.document.activeElement, ctx.canvas);
+    press(ctx, 'Escape');
+    assert.equal($(ctx, '.mlv-rail').getAttribute('data-expanded'), 'false', 'the next Escape collapses the sheet, as in M2');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('the bar sits at the foot of the diagram, above the bottom sheet: Tab goes canvas, walk controls, sheet, and is never held', async () => {
+  for (const width of [1440, 900, 541]) {
+    const ctx = await mount(orderDoc(), { width });
+    try {
+      press(ctx, 'r');
+      const focusable = 'a[href], button:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]';
+      const stops = $$(ctx, focusable).filter((element) => element.tabIndex >= 0 && visible(ctx, element));
+      const inBar = stops.filter((element) => $(ctx, '.mlv-walkbar').contains(element));
+      assert.equal(inBar.length, 1, `${width} px: one tab stop in the bar`);
+      const at = stops.indexOf(ctx.canvas);
+      assert.ok(at >= 0 && at <= 3, `${width} px: the canvas is Tab stop ${at + 1} (${stops.slice(0, at + 1).map((e) => e.className || e.tagName).join(' | ')})`);
+      // In the diagram column, after the canvas; the rail (side panel or bottom sheet) after it.
+      const bar = $(ctx, '.mlv-walkbar');
+      assert.equal(bar.parentElement, $(ctx, '.mlv-main'), 'the bar is part of the diagram column');
+      assert.equal(bar.previousElementSibling, ctx.canvas, 'directly under the diagram');
+      assert.equal(bar.parentElement.nextElementSibling, $(ctx, '.mlv-rail'), 'and directly above the bottom sheet');
+      assert.equal(stops[at + 1], inBar[0], 'Tab from the canvas reaches the walk\'s controls');
+      assert.ok(stops.indexOf($(ctx, '.mlv-rail__tab[aria-selected="true"]')) > at + 1, 'then the claim in the sheet');
+      assert.equal(press(ctx, 'Tab').defaultPrevented, false, 'Tab on the canvas goes to the browser');
+      ctx.app.walkBar.focus();
+      assert.equal(press(ctx, 'Tab').defaultPrevented, false, 'Tab in the bar goes to the browser');
+    } finally {
+      ctx.app.destroy();
+    }
+  }
+});
+
+test('the place is remembered per revision: r resumes it; a remount restores it; another revision starts fresh', async () => {
+  const document = shapedWorkflow(VIT_SHAPE);
+  const ctx = await mount(document, { width: 1440 });
+  let saved;
+  try {
+    press(ctx, 'r');
+    press(ctx, 'j');
+    press(ctx, 'j');
+    const there = ctx.app.walk.current();
+    press(ctx, 'Escape');
+    press(ctx, 'r');
+    eq(ctx.app.walk.current(), there, 'r resumes where the walk ended');
+    assert.equal(ctx.app.walk.position, 2);
+    saved = ctx.app.getState();
+    eq(saved.walk, { filter: 'notObserved', claim: there, active: true });
+    assert.equal(saved.workflowRevision, 'syn-r1');
+    // Nothing but the place is recorded: no verdict or "checked" mark anywhere in the state.
+    assert.doesNotMatch(JSON.stringify(saved), /checked|verdict|reviewed/i);
+  } finally {
+    ctx.app.destroy();
+  }
+  // A remount of the same revision (VS Code rebuilt a hidden panel) brings the running walk back,
+  // and asks the host for nothing until the reader moves or presses Enter.
+  const again = await mount(document, { width: 1440, state: JSON.parse(JSON.stringify(saved)) });
+  try {
+    assert.equal(again.app.walk.active, true);
+    assert.equal(again.app.walk.position, 2);
+    assert.equal(opens(again).length, 0, 'no open on a remount');
+    assert.match($(again, '.mlv-walkbar__editortext').textContent, /^Enter shows .* in the editor beside\.$/);
+    eq(again.app.selection, saved.walk.claim);
+    // Another revision: the walk ends and starts fresh.
+    const next = { ...document, revision: { id: 'syn-r2', parent: 'syn-r1' } };
+    again.app.setWorkflow(next);
+    assert.equal(again.app.walk.active, false);
+    eq(walkFrames(again).at(-1), { v: 1, type: 'walk', state: 'end' });
+    assert.equal(again.app.getState().walk, undefined, 'the place of the old revision is dropped');
+    again.canvas.focus();
+    press(again, 'r');
+    assert.equal(again.app.walk.position, 0, 'a fresh start');
+  } finally {
+    again.app.destroy();
+  }
+  // A saved place for another revision is not applied.
+  const other = await mount({ ...document, revision: { id: 'syn-r9' } }, { width: 1440, state: JSON.parse(JSON.stringify(saved)) });
+  try {
+    assert.equal(other.app.walk.active, false);
+    other.canvas.focus();
+    press(other, 'r');
+    assert.equal(other.app.walk.position, 0);
+  } finally {
+    other.app.destroy();
+  }
+});
+
+/* ── changed files ───────────────────────────────────────────────────── */
+
+test('Changed files is offered only with stale files; the stale notice\'s "Review affected claims" starts the walk on it', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    ctx.bridge.send({ v: 1, type: 'workflowError', message: 'data.py changed since revision o1 was published.', codes: ['stale'] });
+    assert.equal($(ctx, '[data-notice-action="review"]'), null, 'no action before the host reports which files');
+    ctx.bridge.send({ v: 1, type: 'stale', files: [{ path: 'data.py', reason: 'changed' }] });
+    const action = $(ctx, '[data-notice-action="review"]');
+    assert.ok(visible(ctx, action));
+    assert.equal(action.textContent, 'Review affected claims');
+    action.click();
+    assert.equal(ctx.app.walk.active, true);
+    assert.equal(ctx.app.walk.filter, 'changed');
+    // Claims whose quotes cite data.py: load, load→aug, load→step, aug, aug→step, f-two (counter-evidence), f-whole, f-edge.
+    eq(ctx.app.walk.list.map(key), ['node:load', 'edge:c-load-aug', 'edge:c-load-step', 'node:aug', 'edge:c-aug-step', 'issue:f-two', 'issue:f-whole', 'issue:f-edge']);
+    assert.equal($(ctx, '.mlv-walkbar__filter[data-walk-filter="changed"] .mlv-walkbar__fcount').textContent, '8');
+    assert.equal($(ctx, '[data-notice-action="review"]'), null, 'the action goes while the walk runs');
+    assert.equal(ctx.document.activeElement, ctx.canvas, 'the diagram has the keys');
+    // The files are fixed: the filter goes, and the walk keeps its claim on All.
+    const there = ctx.app.walk.current();
+    ctx.bridge.send({ v: 1, type: 'stale', files: [] });
+    assert.equal(ctx.app.walk.filter, 'all');
+    eq(ctx.app.walk.current(), there);
+    assert.equal($(ctx, '.mlv-walkbar__filter[data-walk-filter="changed"]').hidden, true);
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('files that are only in another folder (the root hint) offer no Changed files filter and no review action', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    ctx.bridge.send({ v: 1, type: 'stale', files: [{ path: 'data.py', reason: 'elsewhere' }, { path: 'train.py', reason: 'elsewhere' }] });
+    ctx.bridge.send({ v: 1, type: 'workflowError', message: 'The cited files are under ./sub/.', codes: ['root-hint'] });
+    assert.equal($(ctx, '[data-notice-action="review"]'), null);
+    press(ctx, 'r');
+    assert.equal($(ctx, '.mlv-walkbar__filter[data-walk-filter="changed"]').hidden, true);
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+/* ── the narrow layout ───────────────────────────────────────────────── */
+
+test('at 541 px the bar is "3/16", the filters and Exit; at 900 px it has the place, the keys and the editor line', async () => {
+  const ctx = await mount(shapedWorkflow(YOLO_SHAPE), { width: 541 });
+  try {
+    press(ctx, 'r');
+    press(ctx, 'j');
+    press(ctx, 'j');
+    const bar = $(ctx, '.mlv-walkbar');
+    assert.equal(bar.getAttribute('data-layout'), 'narrow');
+    assert.equal(visible(ctx, $(ctx, '.mlv-header__review')), false, 'the 541 px header keeps the M2 controls; Review is in the ⋯ menu');
+    assert.equal($(ctx, '.mlv-walkbar__postext').textContent, '3/16');
+    assert.equal($(ctx, '.mlv-walkbar__pos').getAttribute('aria-label'), 'Claim 3 of 16, Not observed');
+    assert.equal(visible(ctx, $(ctx, '.mlv-walkbar__keys')), false, 'no key hint');
+    assert.equal(visible(ctx, $(ctx, '.mlv-walkbar__editor')), false, 'no editor line');
+    assert.ok(visible(ctx, $(ctx, '.mlv-walkbar__filter[data-walk-filter="notObserved"]')));
+    const exit = $(ctx, '.mlv-walkbar__exit');
+    assert.ok(visible(ctx, exit));
+    assert.equal(exit.getAttribute('aria-label'), 'Exit the review (Escape)', 'Exit keeps its name when its word is hidden');
+    // A quote the host did not open puts a mark on the place; its name says why.
+    ctx.app.walk.flushOpen();
+    answer(ctx, opens(ctx).at(-1), 'blocked', { reason: 'missing', message: 'utils.py is missing since revision syn-r1 was published; not opened.' });
+    assert.ok(visible(ctx, $(ctx, '.mlv-walkbar__mark')));
+    assert.match($(ctx, '.mlv-walkbar__pos').getAttribute('aria-label'), /utils\.py is missing since revision syn-r1 was published; not opened\./);
+    assert.match($(ctx, '.mlv-quote.is-walk .mlv-quote__walk').textContent, /utils\.py is missing/, 'and the pane says it in full');
+    ctx.resize(900);
+    assert.equal(bar.getAttribute('data-layout'), 'wide');
+    assert.equal($(ctx, '.mlv-walkbar__postext').textContent, 'Claim 3 of 16 · Not observed');
+    assert.ok(visible(ctx, $(ctx, '.mlv-walkbar__keys')));
+    assert.ok(visible(ctx, $(ctx, '.mlv-walkbar__editor')));
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('the header\'s Review button folds with the revision chip when the row is short; the ⋯ menu always has Review', async () => {
+  const ctx = await mount(orderDoc(), { width: 900 });
+  try {
+    const header = $(ctx, '.mlv-header');
+    // jsdom measures nothing: stand in a row that overflows until level 1.
+    Object.defineProperty(header, 'clientWidth', { configurable: true, get: () => 500 });
+    Object.defineProperty(header, 'scrollWidth', { configurable: true, get: () => (Number(header.getAttribute('data-fit')) >= 1 ? 500 : 640) });
+    ctx.app.refreshChrome();
+    assert.equal(header.getAttribute('data-fit'), '1');
+    assert.equal($(ctx, '.mlv-header__review').hidden, true, 'Review folded');
+    assert.equal($(ctx, '.mlv-header__prov').hidden, true, 'with the revision chip');
+    assert.equal($(ctx, '.mlv-chip--exceptions').hidden, false, '"not observed" keeps its count on the row');
+    $(ctx, '.mlv-btn--more').click();
+    assert.ok(visible(ctx, $(ctx, '[data-more-item="review"]')));
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+/* ── motion, opening and the record ──────────────────────────────────── */
+
+test('the walk adds no motion: no transition or animation in its styles, and nothing moves under reduced motion', async () => {
+  const rules = CSS.split('}').filter((rule) => /mlv-walkbar|mlv-quote\.is-walk|mlv-quote__walk|mlv-header__review/.test(rule));
+  assert.ok(rules.length > 5, 'the walk\'s rules are in the shipped stylesheet');
+  for (const rule of rules) assert.doesNotMatch(rule, /transition|animation/, rule.slice(0, 80));
+  const ctx = await mount(orderDoc(), { width: 1440, bodyClass: 'vscode-reduce-motion' });
+  try {
+    press(ctx, 'r');
+    press(ctx, 'j');
+    assert.equal(ctx.app.walk.position, 1, 'the walk works the same with reduced motion');
+    assert.equal($$(ctx, '.mlv-edge__flow').length, 0, 'and starts no flow');
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('a host that cannot open source: the walk selects and announces, and asks for nothing', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440, capabilities: { canOpenSource: false } });
+  try {
+    press(ctx, 'r');
+    assert.equal($(ctx, '.mlv-walkbar__editortext').textContent, 'This view cannot open source files.');
+    await sleep(200);
+    assert.equal(opens(ctx).length, 0);
+    assert.equal(ctx.app.walk.active, true);
+  } finally {
+    ctx.app.destroy();
+  }
+});
+
+test('a click on a claim the walk holds moves the walk there without opening it; an Open link of that claim opens it as the walk\'s quote', async () => {
+  const ctx = await mount(orderDoc(), { width: 1440 });
+  try {
+    press(ctx, 'r');
+    ctx.app.walk.setFilter('all');
+    ctx.app.walk.flushOpen();
+    const count = opens(ctx).length;
+    const card = $(ctx, '.mlv-node[data-node-id="zero"]');
+    card.dispatchEvent(new ctx.window.MouseEvent('click', { bubbles: true, cancelable: true, detail: 1 }));
+    await ctx.app.doubleClick && sleep(10);
+    eq(ctx.app.walk.current(), { kind: 'node', id: 'zero' }, 'the walk followed the click');
+    assert.equal(opens(ctx).length, count, 'a click opens nothing');
+    eq(walkFrames(ctx).at(-1), { v: 1, type: 'walk', state: 'clear' }, 'the old highlight is cleared');
+    assert.match($(ctx, '.mlv-walkbar__editortext').textContent, /^Enter shows nb\.ipynb · cell 7 · lines 2–3 in the editor beside\.$/);
+    $(ctx, '.mlv-quote__open').click();
+    const frame = opens(ctx).at(-1);
+    assert.equal(frame.evidenceId, 'e5');
+    assert.equal(frame.walk, true, 'the Open link went through the walk (no notification when blocked)');
+    assert.equal(frame.cell, 7);
+  } finally {
+    ctx.app.destroy();
+  }
+});

From 0b87a0c3d273ec86612eb1af17d3c5b7c752f08c Mon Sep 17 00:00:00 2001
From: realmyang 
Date: Fri, 2 Oct 2026 21:23:40 +0200
Subject: [PATCH 04/16] Viewer M3 step 11: document the review walk

CHANGELOG (the M3 section), STATUS, README, LLM_WORKFLOW, the webview and
extension READMEs: what the walk visits and in which order, the filters,
the keys, the walk bar, the place per revision, Review affected claims,
the host's walk clear, and what was checked (local tests, plus a short live
run on vit-cc in an isolated Extension Development Host).

Co-Authored-By: Claude Opus 5.5 
---
 CHANGELOG.md               | 99 ++++++++++++++++++++++++++++++++------
 README.md                  | 17 +++++--
 docs/LLM_WORKFLOW.md       | 45 ++++++++++++++---
 docs/STATUS.md             | 27 ++++++++++-
 vscode-extension/README.md | 27 ++++++++---
 webview/README.md          | 65 ++++++++++++++++++++++---
 6 files changed, 241 insertions(+), 39 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1468bed2..3c6b9ef0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,16 +8,88 @@ truth lives in [docs/STATUS.md](docs/STATUS.md) and
 
 ## Unreleased — viewer M3: review walk and the way back
 
-The viewer's third milestone, in progress. This part is the host side of the
-review walk (roadmap step 12), a fix for Escape, and a look at the cost of
-jumping through a large notebook. The walk itself, which steps through the
-diagram's claims and opens each one's source, comes in a later step; until
-then nothing here changes what a reader sees except Escape and less work on
-repeated notebook jumps. Checked by local jsdom and mock `vscode` tests
-(mutation-checked against the fixes) and in an isolated VS Code 1.139 Extension
-Development Host on macOS driven over the DevTools protocol. Not tried on
-Windows or Linux, with a screen reader or as a usability check. No contract
-change, no new setting, no geometry change, and the version is unchanged.
+The viewer's third milestone, in progress. So far: the review walk, which goes
+through the diagram claim by claim and opens each one's cited lines beside it
+(roadmap step 11), the host side of that walk (step 12), a fix for Escape, and
+a look at the cost of jumping through a large notebook. Checked by local jsdom
+and mock `vscode` tests (mutation-checked against the fixes) and in an isolated
+VS Code 1.139 Extension Development Host on macOS driven over the DevTools
+protocol. Not tried on Windows or Linux, with a screen reader or as a usability
+check. No contract change, no new setting, no geometry change, and the version
+is unchanged.
+
+The review walk (step 11):
+- Press `r` on the diagram, **Review** in the header or **Review the claims**
+  in the **⋯** menu to go through the displayed revision claim by claim. The
+  order is the diagram's: phase by phase, each step, then its outgoing
+  connections, then the findings whose first cited step it is. A finding that
+  cites no step (only connections, or the workflow as a whole) has no place
+  in that order; the roadmap does not say where it goes, so these come last,
+  in document order. Every step, connection and finding is visited exactly
+  once: 79 claims (31 + 41 + 7) in the vit-cc shakedown artifact and 176
+  (59 + 113 + 4) in yolov5-cc2, counted by the walk's own order on both
+  documents and pinned by synthetic test documents of the same shape.
+- The walk starts on **Not observed**, the claims marked inferred or
+  unresolved: 7 in vit-cc and 16 in yolov5-cc2, the same numbers as the
+  header's **N not observed**. The other filters are **Findings**, **All**
+  and, only when VS Code reports changed or missing cited files, **Changed
+  files**. Each shows its count; a filter with nothing in it is not offered.
+- Keys while walking: `j` / `k` or ↓ / ↑ for the next or previous claim, `[`
+  / `]` for the claim's quotes, Enter to open the current quote again
+  (Alt+Enter also moves the focus to the editor), `n` / `p` for the next or
+  previous finding in the walk's order, and `r` or Escape to end it. `u` starts
+  the walk on Not observed, and `u` / Shift+U then step through those claims
+  whatever the filter. ← and → still move to the nearest card. Outside the
+  walk `j`, `k`, `[`, `]` and the arrows do what they did; the walk uses no Ctrl
+  or Cmd keys.
+- Each step selects the claim and brings it into view (a finding frames the
+  steps it cites), shows it in the Selection tab (a hidden side panel or a
+  collapsed bottom panel opens), and, once you stop for about 150 ms, opens
+  its cited lines in the editor beside the diagram with the range highlighted
+  while the keyboard stays on the diagram. A claim with no quotes opens
+  nothing and says so, and the previous claim's highlight goes. A quote VS
+  Code did not open (its file changed, went missing or has unsaved edits)
+  shows the reason in the walk bar and under the quote in the Selection tab;
+  nothing is opened and no notification appears. A screen reader hears, for
+  example, "Claim 3 of 16, not observed: Step Load batches, inferred."
+- The walk bar sits at the foot of the diagram, directly above the bottom
+  panel's tabs (with the side panel, along the bottom of the diagram), and is
+  shown only while walking: "Claim 3 of 16 · Not observed", the filters, the
+  keys, **Exit**, and a line such as "In the editor beside: train.py · lines
+  12–14, highlighted. Focus stays here." Below 620 px wide it is one row:
+  "3/16", the filters and **Exit**; a quote that was not opened adds a warning
+  mark there and the Selection tab says why. It sits under the diagram rather
+  than under the header so the diagram stays within four Tab presses of the
+  top, and Tab goes from the diagram to the walk's controls to the claim.
+- The walk remembers where it was for each revision in the panel's saved view
+  state: `r` resumes there, and a panel VS Code rebuilt brings a running walk
+  back without opening anything until you move or press Enter. A new revision
+  starts fresh. Nothing marks a claim as checked, and nothing is written to
+  any file.
+- The notice for changed cited files has **Review affected claims**, which
+  walks the claims whose quotes cite those files.
+- The header's **Review** button is shown from 620 px wide and folds into the
+  **⋯** menu with the revision when the row is short; the menu always has it.
+- Clicking or searching to another claim the walk holds moves the walk there
+  without opening it (Enter opens it), and clears the earlier highlight.
+- The walk counts every claim in the document; the severity toggles and the
+  **N not observed** fade do not change what it visits.
+- Live (vit-cc, VS Code 1.139, macOS, the diagram about 393, 543 and 902 px
+  wide beside the notebook): `r` started the walk on 7 claims, each step
+  opened the notebook beside it with the cited cell lines highlighted and the
+  focus left in the diagram, `]` opened the second quote, Escape ended the
+  walk, and no notification appeared. Found in that run: after `]` the
+  second quote stayed below the Selection tab's fold. The tab now scrolls the
+  walk's quote into view; that fix is checked in jsdom only, not live.
+
+The host side, for the walk (added with step 11):
+- A new `walk` message state, `clear`, sent when the walk moves to a claim it
+  opens nothing for (no quotes, or a claim you only selected): the host clears
+  the highlight and drops a walk open still on its way, as for the walk's
+  end.
+- A blocked walk open also clears the previous claim's highlight, so the
+  editor never shows an earlier claim's lines while the walk says this one was
+  not opened. A blocked Enter, double-click or Open link keeps it, as before.
 
 Opening a cited range for the walk (`openLocation`, no change for Enter,
 double-click or an Open link):
@@ -25,9 +97,8 @@ double-click or an Open link):
   `highlight: false`. The host drops an open whose number is not above the
   last one it saw, and one a later open overtook while it waited (for example
   for a notebook cell's editor). A new page starts the numbering again. The
-  walk is expected to wait about 150 ms after the reader stops moving before
-  it asks for a jump; that pause belongs to the walk step and is not in the
-  viewer yet.
+  walk waits about 150 ms after the reader stops moving before it asks for a
+  jump.
 - Each open with a request id gets one answer: done, blocked, cancelled or
   failed. A blocked answer names the reason and says nothing was
   opened, for example "vit_pytorch/efficient.py changed after revision
@@ -48,7 +119,7 @@ double-click or an Open link):
 
 Escape:
 - An Escape the viewer used (closing the menu, the shortcut sheet, the Refine
-  popover or the legend, collapsing the bottom panel, leaving focus mode,
+  popover or the legend, ending the review walk, collapsing the bottom panel, leaving focus mode,
   clearing the selection or the search) no longer also reaches VS Code. VS
   Code's webview forwards every key to the workbench, even one the page has
   handled, so a viewer Escape also hid a visible notification, which was
diff --git a/README.md b/README.md
index cfd14266..7968191e 100644
--- a/README.md
+++ b/README.md
@@ -53,9 +53,10 @@ in the runbook. Only install one copy of the skill in each discovery path.
 To refine a particular node, edge, or finding, select it and use **Refine →
 Copy prompt**. Choose an intent or enter a specific question, then paste the
 prompt into the same assistant. The header is one row: the title, the
-assistant and revision, search, the severity toggles, **N not observed**, a
-**⋯** menu (legend, flow animation, fit, exports, shortcuts) and **Refine…**.
-In a narrow panel, such as beside your code, search and the revision move
+assistant and revision, search, the severity toggles, **N not observed**,
+**Review**, a **⋯** menu (legend, flow animation, fit, exports, shortcuts) and
+**Refine…**.
+In a narrow panel, such as beside your code, search, the revision and **Review** move
 into the **⋯** menu, and a row that is still too full folds **N not
 observed** into it too, so **Refine…** stays in view. The status bar counts steps and connections, shows the
 coverage status with its limitations, and says whether the cited files are
@@ -82,6 +83,16 @@ narrower than about 1260 px the rail is a bottom sheet under the diagram: a
 tab strip until you select something, then about half the height, with the
 selected card kept in view above it; Escape collapses it.
 
+To check a diagram claim by claim, press `r` (or **Review**). The review walk
+starts on the claims marked inferred or unresolved, the header's **N not
+observed** count, and can also walk the findings, every claim, or, after a
+cited file changed, the claims citing it. Each step selects the claim, shows
+it in Selection and, after a short pause, opens its cited lines beside the
+diagram, highlighted, while the keyboard stays on the diagram: `j` / `k` (or
+↓ / ↑) move, `[` / `]` change quote, Enter opens again and Escape ends the
+walk. A quote whose file changed is not opened; the walk says why. The walk
+remembers its place for each revision and records nothing else.
+
 The workflow supports custom phases, nested groups, branches and cycles,
 notebook cell references, and findings with evidence and counter-evidence.
 Observed, inferred, and unresolved claims remain distinguishable: only the
diff --git a/docs/LLM_WORKFLOW.md b/docs/LLM_WORKFLOW.md
index 3176d5d2..a1c423d8 100644
--- a/docs/LLM_WORKFLOW.md
+++ b/docs/LLM_WORKFLOW.md
@@ -168,6 +168,36 @@ again keeps its tab, its selection and an open bottom panel. With VS Code's
 screen-reader optimisation on, a selection is announced by its claim and
 nothing animates.
 
+The review walk goes through the displayed revision claim by claim. Press `r`
+on the diagram, **Review** in the header or **Review the claims** in the **⋯**
+menu. It follows the diagram's order: phase by phase, each step, then its
+outgoing connections, then the findings whose first cited step it is;
+findings that cite no step (only connections, or the workflow as a whole) come
+last, in document order. It starts on **Not observed**, the claims marked
+inferred or unresolved, with the same count as the header's **N not
+observed**; **Findings**, **All** and, while VS Code reports changed or
+missing cited files, **Changed files** are the other filters, each with its
+count. `j` / `k` or ↓ / ↑ go to the next or previous claim, `[` / `]` to the
+claim's other quotes, Enter opens the current quote again (Alt+Enter moves the
+focus to the editor), `n` / `p` go to the next or previous finding, `u` /
+Shift+U to the next or previous claim not observed (`u` also starts the walk
+there), and Escape or `r` ends the walk. ← and → still move to the nearest
+card. Each step selects the claim, brings it into view and shows it in the
+Selection tab; about 150 ms after you stop, its cited lines open in the editor
+beside the diagram with the range highlighted, and the keyboard stays on the
+diagram. A claim with no quotes opens nothing and clears the previous
+highlight. A quote whose file changed, went missing or has unsaved edits is
+not opened: the walk bar and the quote in the Selection tab say why, and no
+notification appears. A screen reader hears, for example, "Claim 3 of 16, not
+observed: Step Load batches, inferred." The walk bar sits under the diagram,
+above the bottom panel's tabs (with the side panel, along the bottom of the
+diagram), and shows the place and filter, the filters, the keys, **Exit** and
+what the editor beside shows; below 620 px wide it is "3/16", the filters and
+**Exit**. The walk remembers its place for each revision in the panel's view
+state, so `r` resumes there; a new revision starts fresh. It marks nothing as
+checked and writes nothing to any file. When cited files change, the notice
+offers **Review affected claims**, which walks the claims citing them.
+
 On the diagram, observed claims carry no basis mark. An inferred step or
 connection has a dashed border or line and an `inferred` tag; an unresolved
 one has a dotted border or line and a `? unresolved` tag. Line style shows
@@ -196,19 +226,20 @@ every group. Zoomed out below 62%, cards show only their titles, at about
 11 px on screen down to about 35% zoom; the full title is in the hover card.
 
 The header is one row: the title, the assistant and revision, search, the
-severity toggles (each with its count), **N not observed**, a **⋯** menu and
-**Refine…**. In a panel under 620 px wide, such as beside your code, search
-and the revision move into the **⋯** menu; a row still too full folds **N not
+severity toggles (each with its count), **N not observed**, **Review**, a
+**⋯** menu and **Refine…**. In a panel under 620 px wide, such as beside your
+code, search, the revision and **Review** move into the **⋯** menu; a row still too full folds **N not
 observed** into it as well, so **Refine…** stays in view. The menu also holds the legend, the
 flow animation, the overview map, the side or bottom panel, **Fit the whole diagram**,
-zoom to the selection, the SVG and PNG exports and the shortcut sheet. The
-overview map item is disabled, with the reason, when the map is not drawn: in
+zoom to the selection, the SVG and PNG exports and the shortcut sheet, and
+always **Review the claims**. The overview map item is disabled, with the reason, when the map is not drawn: in
 a panel 900 px wide or narrower, a diagram under 350 px tall, or with fewer
 than 30 cards. Ctrl+F (Cmd+F on macOS), or `/` on the diagram, focuses
 search; the viewer's other keys are single keys, so VS Code's own Ctrl and Cmd
 shortcuts keep working, and the shortcut sheet prints them for your platform.
-Escape closes one thing at a time in the viewer (a menu or panel, the bottom
-sheet, focus mode, the selection, then the focus on the diagram) without VS
+Escape closes one thing at a time in the viewer (a menu or panel, the review
+walk, the bottom sheet, focus mode, the selection, then the focus on the
+diagram) without VS
 Code also acting on it; after that it goes to VS Code, for example to hide a
 notification. Each search result shows its
 title and, under it, where it is cited. The status bar counts steps and
diff --git a/docs/STATUS.md b/docs/STATUS.md
index 947c161c..48732c20 100644
--- a/docs/STATUS.md
+++ b/docs/STATUS.md
@@ -143,6 +143,30 @@ the hint's and VS Code's Add Folder, Save Workspace As, Restart Extension Host,
 Reload Window and the multi-root case; an extension install or update was not
 tried ([changelog](../CHANGELOG.md)).
 
+Unreleased viewer M3, step 11 (the review walk): `r`, the header's **Review**
+button or **Review the claims** in the **⋯** menu goes through the displayed
+revision claim by claim, in the diagram's order (each step, its outgoing
+connections, then the findings whose first cited step it is; findings that
+cite no step come last). Every claim is visited once: 79 in vit-cc, 176 in
+yolov5-cc2. It starts on **Not observed** (7 and 16, the header's counts);
+**Findings**, **All** and, when cited files changed, **Changed files** are the
+other filters. `j` / `k` or ↓ / ↑ step, `[` / `]` change quote, Enter opens
+again, `u` / Shift+U go through the claims not observed, `n` / `p` through the
+findings, and Escape or `r` ends it. About 150 ms after each step the cited
+lines open beside the diagram, highlighted, with the keyboard kept on the
+diagram; a quote VS Code did not open says why in the walk bar and the
+Selection tab, with no notification. The bar sits under the diagram, above the
+bottom panel's tabs, and shrinks to "3/16", the filters and Exit below 620 px.
+The place is remembered per revision in the panel's view state; nothing marks
+a claim as checked. The changed-files notice offers **Review affected
+claims**. The host gained a `walk` `clear` message and clears the highlight
+on a blocked walk open. Checked by local jsdom and mock `vscode` tests (with
+synthetic documents of the vit-cc and yolov5-cc2 shape, the real host with
+the built viewer, and mutation checks) and briefly in an isolated VS Code
+1.139 Extension Development Host on macOS (vit-cc beside its notebook at about
+393, 543 and 902 px); not with a screen reader, on Windows or Linux, or as a
+usability check ([changelog](../CHANGELOG.md)).
+
 Unreleased viewer M3, step 12 (the host side of the review walk) and Escape:
 an `openLocation` request may carry a sequence number, a request id, a walk
 flag and `highlight: false`. The host drops an open a later one has
@@ -154,8 +178,7 @@ double-click or an Open link still does. A `walk` end message clears the
 cited-range highlight and its overview-ruler mark, as closing the panel does.
 The check behind a jump is cached per revision and freshness: 60 jumps into a
 synthetic 3.8 MB notebook hashed it once instead of 60 times
-([performance](PERFORMANCE.md)). The walk itself (step 11) is not in the
-viewer yet. An Escape the viewer used no longer also reaches VS Code (where
+([performance](PERFORMANCE.md)). An Escape the viewer used no longer also reaches VS Code (where
 it hid a notification); with nothing left to close and the focus off the
 diagram, Escape goes to VS Code. The M2 report of focus lost on Escape after
 Enter opened a notebook was not reproduced in 14 live attempts, so this fixes
diff --git a/vscode-extension/README.md b/vscode-extension/README.md
index d3c10c66..5e337487 100644
--- a/vscode-extension/README.md
+++ b/vscode-extension/README.md
@@ -64,6 +64,20 @@ the arrow keys choose one; `b` shows or hides the rail. A resize or a rail
 change that hides the selected card pans just enough to show it again, and a
 panel shown again after being hidden keeps its selection and an open sheet.
 Notebook cells are numbered from 0, as the artifact records them.
+`r` (or **Review** in the header, or **Review the claims** in the **⋯** menu)
+starts the review walk: claim by claim in the diagram's order (each step, its
+outgoing connections, then the findings whose first cited step it is;
+findings citing no step last), starting on the claims not observed, with
+**Findings**, **All** and, after a cited file changed, **Changed files** as the
+other filters. `j` / `k` or ↓ / ↑ move, `[` / `]` change quote, Enter opens
+again, `u` / Shift+U and `n` / `p` go through the claims not observed and the
+findings, and Escape or `r` ends it. About 150 ms after each step the claim's
+cited lines open beside the diagram, highlighted, with the keyboard kept on
+the diagram; a quote whose file changed or is missing is not opened, and the
+walk bar (under the diagram) and the Selection tab say why, with no
+notification. The walk remembers its place per revision in the panel's view
+state and records nothing else; the changed-files notice offers **Review
+affected claims**.
 Enter, a double-click (on a step, connection, finding or Outline step) or a
 quote's **Open** link opens the cited range beside the diagram: the whole range is selected and highlighted, and focus
 stays in the diagram. The source goes to an editor group you already have
@@ -90,19 +104,20 @@ document if it fits at 62% or more, otherwise the first phase at 90%); `0`
 returns there, and **Fit the whole diagram** shows everything. Zoomed out,
 cards show only their titles, at about 11 px.
 The header is one row of about 36 px: the title, the assistant and revision,
-search (Ctrl+F, or Cmd+F on macOS), the severity toggles, **N not observed**, a **⋯** menu
-and **Refine…**, which names the step, connection or finding it will refine.
+search (Ctrl+F, or Cmd+F on macOS), the severity toggles, **N not observed**,
+**Review**, a **⋯** menu and **Refine…**, which names the step, connection or
+finding it will refine.
 Below 620 px wide only the title, the severity toggles, **N not observed**,
-**⋯** and **Refine…** stay in the row; search and the revision move into the
-**⋯** menu, which also holds the legend, the flow animation, the overview map,
+**⋯** and **Refine…** stay in the row; search, the revision and **Review** move
+into the **⋯** menu, which always has **Review the claims** and also holds the legend, the flow animation, the overview map,
 the side or bottom panel, **Fit the whole diagram**, the exports and the shortcut sheet.
 The overview map item is disabled, with the reason, when the map is not drawn
 (at 900 px wide or narrower, under 350 px tall, or below 30 cards). The
 viewer's other keys are single keys, so VS Code's Ctrl and Cmd shortcuts are
 left alone; the shortcut sheet prints the keys for your platform.
 Escape in the diagram closes the topmost thing (the menu, the shortcut sheet,
-the Refine popover, the legend, the open bottom panel, focus mode, the
-selection) or clears the search, and VS Code does not also act on that key
+the Refine popover, the legend, the review walk, the open bottom panel, focus
+mode, the selection) or clears the search, and VS Code does not also act on that key
 press. Once nothing is left to close and the focus is off the diagram, Escape
 goes to VS Code, for example to hide a notification.
 The status bar reads, for example, "31 steps · 41 connections",
diff --git a/webview/README.md b/webview/README.md
index 3f7bef90..61f3f745 100644
--- a/webview/README.md
+++ b/webview/README.md
@@ -182,7 +182,8 @@ golden is byte-identical):
   canvas (the extension sets no `enableFindWidget`, so the webview has no find
   bar of its own; Ctrl/Cmd+K did the same until the live-check fixes). Search rows print the title first and the location under
   it, cut from the start; `.mlv-result__count` heads the list.
-- Chrome icons are 19 inline SVG paths in `src/icons.ts` (`uiIcon`), drawn in
+- Chrome icons are 20 inline SVG paths in `src/icons.ts` (`uiIcon`; viewer M3
+  added `review`), drawn in
   the codicon style; there is no icon font, so the CSP is unchanged.
 - `test/header-m2.test.mjs` injects the shipped stylesheet and stubs the root
   width to check the header at 1440, 900 and 541 px, the ⋯ menu, the removed
@@ -340,9 +341,8 @@ setting; the golden is byte-identical):
 - The host drops a numbered open whose `seq` is not above the last one it saw
   on this page (answered `cancelled`), and an open a later open overtook while
   it waited (a notebook's cell editor, for example). A new page (`ready`)
-  starts the numbering again. The walk itself (step 11) should send a jump
-  only after the reader has stopped moving for about 150 ms; that debounce is
-  not in the viewer yet.
+  starts the numbering again. The walk sends a jump only after the reader has
+  stopped moving for `WALK_OPEN_DEBOUNCE_MS` (150 ms, `src/app/walk.ts`).
 - `actionResult` answers `openLocation` too: `done`, `blocked` (not opened,
   with `reason` and a short `message` such as "train.py changed after
   revision r3 was published; not opened."), `cancelled` or `failed`. It
@@ -356,7 +356,11 @@ setting; the golden is byte-identical):
   a `requestId`.
 - `{ type: 'walk', state: 'end' }` is new: the walk ended, so the host clears
   the cited-range highlight (and its overview-ruler mark) and drops a walk open
-  still waiting. Closing the panel clears it too.
+  still waiting. Closing the panel clears it too. `state: 'clear'` (added with
+  step 11) does the same while the walk goes on: the walk moved to a claim it
+  opens nothing for (no quotes, or a claim the reader only selected). A
+  blocked walk open also clears the previous claim's highlight; a blocked
+  ordinary open keeps it.
 - The checks behind a jump are cached per revision and freshness version, keyed
   by each cited file's device, inode, size, and modification and change times
   (`checkCitedFile` in `vscode-extension/src/authoredPanel.ts`). The first jump
@@ -376,6 +380,53 @@ setting; the golden is byte-identical):
   handled too. `authoredEscapeHandshake` in `test/authored-handshake.mjs` pins
   both with a stand-in forwarder attached before the scripts.
 
+Viewer M3 review walk, the viewer (roadmap step 11; no contract change, no new
+setting; the golden is byte-identical):
+
+- `src/walk.ts` is pure: `claimOrder(index)` walks the drawn order (lanes, then
+  `roots` and `laneChildren` depth first, as the Outline lists them): each
+  step, its `outEdges`, then the findings whose first cited step in that order
+  it is; then any connection whose source no lane reached (none can today),
+  then findings citing no step, in document order (the roadmap is silent on
+  those). It also holds the
+  filters (`notObserved` uses `isNotObserved`, the same test as the header's
+  count; `changed` is offered unless every stale file is only in another
+  folder, the root hint's case),
+  `positionFor` (keep the claim, else the next one in drawn order), and the
+  bar, pane and live-region wording.
+- `src/app/walk.ts` (`ReviewWalk`) runs it: start, stop, step, quotes, the
+  `u` and `n` / `p` jumps, filters, the debounced numbered open
+  (`openLocation` with `walk: true`, `seq`, `requestId` via
+  `App.postRequest`), only the latest answer shown, `walk: 'clear'` for a
+  claim with nothing to open, and the place per revision. A reader's own
+  selection of a claim in the list moves the walk without opening it.
+- `src/ui/walkbar.ts` is the bar: a labelled region at the end of `.mlv-main`
+  (after the canvas, before the rail), one `role="toolbar"` tab stop for the
+  filters and Exit, `data-layout="narrow"` below 620 px. Escape inside it ends
+  the walk; j, k, [, ], u, n and p pressed there go to the walk.
+- `ViewState.walk` (`WalkViewState`: `filter`, `claim`, `quote` when not the
+  first, `active` while running) is written only once a walk ran for the
+  displayed revision, restored only for the same `workflowRevision`
+  (`sanitizeWalk`), and a remount resumes a running walk without posting an
+  open. No other walk state is kept; nothing is a verdict.
+- Keys (`KEYMAP`, `handleCanvasKey`): `r` toggles, `u` / Shift+U, and only
+  while walking `j` / `k`, ↓ / ↑ and `[` / `]`; `n` / `p` follow the walk's
+  order while it runs (`CommandPort.walkFindings`). The Escape cascade ends
+  the walk after the legend and before the bottom sheet (`appkeys.ts`), and an
+  Escape inside the open sheet ends a running walk first.
+- The header's `.mlv-header__review` goes with the revision chip (below
+  620 px or at fit level 1); the ⋯ menu always has `review`. `HostNotice`
+  offers `[data-notice-action="review"]` for `stale` while claims cite a
+  changed file. The Selection pane marks the walk's quote (`applyWalkMark`:
+  `.mlv-quote.is-walk`, `.mlv-quote__walk`) in place and scrolls it into view
+  on `[` / `]`.
+- `test/walk.test.mjs` covers the order on synthetic documents with the
+  vit-cc and yolov5-cc2 shapes (79 and 176 claims), filter counts against the
+  header, keys, debounce and `seq`, blocked answers, announcements, the place
+  per revision, Changed files, Tab order and 541 / 900 px.
+  `authoredWalkHandshake` in `test/authored-handshake.mjs` drives the real
+  host with the built viewer.
+
 Viewer M1 cleanup (no contract change):
 
 - The bundle contains only the authored path. Inbound, the viewer handles
@@ -384,8 +435,8 @@ Viewer M1 cleanup (no contract change):
   Diagram") and `restoreState` (the tests drive collapse with it); any other
   type is answered with a `log` frame and ignored. Outbound it posts
   `openLocation`, `workspaceHint`, `refineWorkflow`, `copy`, `exportFile` and
-  `log` (viewer M3 adds `walk` to the protocol for the review walk; the viewer
-  does not send it yet); the host bootstrap posts `ready`.
+  `log`, and since viewer M3 `walk` (sent by the review walk); the host
+  bootstrap posts `ready`.
 - A saved `ViewState` with keys the viewer no longer writes (for example
   `showSuppressed` or `railGroupBy`) still loads; those keys are ignored.
 - `MLGraph` carries only what an authored document fills in. Fields of the

From 688611222125495f31fef1c4d525e98e28b5bbe1 Mon Sep 17 00:00:00 2001
From: realmyang 
Date: Fri, 2 Oct 2026 22:17:24 +0200
Subject: [PATCH 05/16] Viewer M3 step 13: the phase overview and the labelled
 phase index

Shift+0 (or Phase overview in the ... menu) draws every phase as a block
over the canvas, outside the world layer: number, label, step count with
the inferred and unresolved ones, findings touching the phase (PR #14
rule), then the step titles in the Outline's reading order with basis
marks (a drawn dotted ring for inferred, ? for unresolved) and F labels the
severity toggles keep. Arrows join neighbouring phases with "N
connections"; skipped or backward links (adjacent backward ones included)
are brackets on the right, packed into shared slots. A block that does not
fit ends with "... N more steps", so listed + counted = steps per block and
in all, and inside + arrows + brackets = connections. The geometry is pure
(render/phaseoverview.ts): two title columns from 600 px blocks, one
below 620 px, trimmed from the longest block, never below two titles and
the count, scrolling past that.

Arrows, Home and End move between blocks (roving tab stop, screen-reader
names and descriptions); Enter, Space or a click animates to that phase at
reading size (phasePlan, about 240 ms, instant under reduced motion) with
the focus on the canvas, and the next arrow starts at the phase's first
step. Escape, Shift+0 or Back returns to the viewport and focus the reader
had; any other canvas key closes the overview first and then acts.

The labelled phase index replaces the minimap: rows with number, label,
severity counts and step count, phases in view marked, a row going to its
phase; below 1000 px (or a canvas under 350 px tall) a "k/N label" pill
that opens the rows above itself. It sits inside the canvas, above the
bottom sheet, and the viewport treats it as covering the canvas: reveal,
centring, framing a finding's anchor and the visibility test pan the
least distance off it. The ... menu's map item is now Phase index; saved
minimapCollapsed opens the index folded.

Shift+0 no longer folds every group; Fit the whole diagram stays in the
menu. The geometry golden is unchanged. Tests: phase-overview.test.mjs
(geometry at the canvases of 1440x900, 900x800 and 541x798 on synthetic
vit-cc and yolov5-cc2 shapes, counts, link classes, keys, Escape focus,
animation and reduced motion, names, the index never covering the focused
card along arrows, Outline, search, host reveal, findings and the walk),
plus deliberate updates to tests that held the minimap and the old Shift+0.

Co-Authored-By: Claude Opus 5.5 
---
 vscode-extension/media/mlview.css     |   2 +-
 vscode-extension/media/mlview.js      |  16 +-
 webview/build.mjs                     |   2 +
 webview/dist/mlview.css               |   2 +-
 webview/dist/mlview.js                |  16 +-
 webview/src/app.ts                    |  31 +-
 webview/src/app/build.ts              |  13 +-
 webview/src/app/documents.ts          |   2 +-
 webview/src/app/keys.ts               |  55 +-
 webview/src/app/state.ts              |  10 +-
 webview/src/app/surfaces.ts           |   5 +-
 webview/src/canvas/host.ts            |  21 +-
 webview/src/canvasview.ts             | 300 ++++++---
 webview/src/icons.ts                  |   6 +-
 webview/src/layout/layout.ts          |   4 +-
 webview/src/render/canvas.ts          | 343 ++++++-----
 webview/src/render/edgehover.ts       |   2 +-
 webview/src/render/phase.ts           |   2 +-
 webview/src/render/phaseindex.ts      | 381 ++++++++++++
 webview/src/render/phaseoverview.ts   | 510 ++++++++++++++++
 webview/src/render/scene.ts           |  22 -
 webview/src/styles/chrome.css         |  88 +--
 webview/src/styles/export.css         |   5 +-
 webview/src/styles/overview.css       | 566 +++++++++++++++++
 webview/src/styles/workflow.css       |   8 -
 webview/src/types.ts                  |  12 +-
 webview/src/ui/appkeys.ts             |  18 +-
 webview/src/ui/chrome.ts              |  23 +-
 webview/src/ui/commands.ts            |   2 +-
 webview/src/ui/keymap.ts              |  14 +-
 webview/src/ui/legend.ts              |  10 +-
 webview/src/ui/moremenu.ts            |  49 +-
 webview/src/ui/overview.ts            | 362 +++++++++++
 webview/src/ui/shell.ts               |  21 +-
 webview/test/header-m2.test.mjs       |  40 +-
 webview/test/helpers.mjs              | 104 ++++
 webview/test/m2-live.test.mjs         |  61 +-
 webview/test/phase-overview.test.mjs  | 838 ++++++++++++++++++++++++++
 webview/test/readable-view.test.mjs   |  11 +-
 webview/test/viewer-layout.test.mjs   |  26 +-
 webview/test/walk.test.mjs            | 104 +---
 webview/tools/screenshots/capture.mjs |  82 ++-
 42 files changed, 3590 insertions(+), 599 deletions(-)
 create mode 100644 webview/src/render/phaseindex.ts
 create mode 100644 webview/src/render/phaseoverview.ts
 create mode 100644 webview/src/styles/overview.css
 create mode 100644 webview/src/ui/overview.ts
 create mode 100644 webview/test/phase-overview.test.mjs

diff --git a/vscode-extension/media/mlview.css b/vscode-extension/media/mlview.css
index f0e21e3e..a9306416 100644
--- a/vscode-extension/media/mlview.css
+++ b/vscode-extension/media/mlview.css
@@ -1 +1 @@
-:root,.mlv-root[data-theme=light]{--mlv-font: var(--vscode-font-family, ui-sans-serif, -apple-system, "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif);--mlv-font-mono: var(--vscode-editor-font-family, "Cascadia Code", "JetBrains Mono", Consolas, ui-monospace, monospace);--mlv-fs-10: 10.5px;--mlv-fs-11: 11px;--mlv-fs-12: 12px;--mlv-fs-13: 13px;--mlv-fs-14: 14px;--mlv-fs-16: 16px;--mlv-fs-20: 20px;--mlv-compact-title: 11.2px;--mlv-lh-tight: 1.35;--mlv-lh-body: 1.5;--mlv-fw-regular: 450;--mlv-fw-medium: 550;--mlv-fw-semi: 650;--mlv-track-caps: .04em;--mlv-s1: 2px;--mlv-s2: 4px;--mlv-s3: 6px;--mlv-s4: 8px;--mlv-s5: 12px;--mlv-s6: 16px;--mlv-s7: 20px;--mlv-s8: 24px;--mlv-s9: 32px;--mlv-s10: 48px;--mlv-r-chip: 4px;--mlv-r-btn: 6px;--mlv-r-node: 10px;--mlv-r-lane: 14px;--mlv-r-panel: 12px;--mlv-r-pill: 999px;--mlv-sh-1: 0 1px 2px rgba(16, 18, 24, .06), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 4px 12px rgba(16, 18, 24, .1), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 16px 40px rgba(16, 18, 24, .18), 0 0 0 1px var(--mlv-border-strong);--mlv-dur-1: .12s;--mlv-dur-2: .18s;--mlv-dur-3: .26s;--mlv-ease: cubic-bezier(.2, .8, .2, 1);--mlv-flow-speed: 220;--mlv-flow-pulse-speed: 320;--mlv-flow-head: 12px;--mlv-flow-gap: 34px;--mlv-flow-gap-call: 96px;--mlv-flow-gap-back: 24px;--mlv-flow-dur-data: .21s;--mlv-flow-dur-call: .49s;--mlv-flow-dur-back: 165ms;--mlv-flow-dur-min: .38s;--mlv-flow-dur-max: 2.2s;--mlv-flow-hop: 90ms;--mlv-flow-width: 3px;--mlv-flow-port-r: 3.5px;--mlv-flow-color: var(--mlv-accent);--mlv-flow-halo-opacity: .18;--mlv-flow-glow-opacity: .42;--mlv-flow-core-width: 1.6;--mlv-flow-underlay-opacity: .28;--mlv-node-w: 216px;--mlv-node-w-lg: 248px;--mlv-node-w-sm: 176px;--mlv-node-h: 72px;--mlv-rail-w: 4px;--mlv-group-header-h: 34px;--mlv-lane-pad: 20px;--mlv-header-h: 36px;--mlv-status-h: 22px;--mlv-rail-width: 360px;--mlv-bg: var(--vscode-editor-background, #FBFBFD);--mlv-surface: var(--vscode-editorWidget-background, #FFFFFF);--mlv-surface-2: var(--vscode-list-hoverBackground, #F3F4F8);--mlv-border: var(--vscode-widget-border, #E3E5EB);--mlv-border-strong: var(--vscode-widget-border, #C9CDD6);--mlv-text: var(--vscode-editor-foreground, #16181D);--mlv-text-2: var(--vscode-descriptionForeground, #5A6070);--mlv-text-3: var(--vscode-descriptionForeground, #676E81);--mlv-link: var(--vscode-textLink-foreground, #2B57C4);--mlv-accent: var(--vscode-focusBorder, #3B6CF6);--mlv-accent-solid: var(--vscode-button-background, #2B57C4);--mlv-on-accent: var(--vscode-button-foreground, #FFFFFF);--mlv-focus: var(--vscode-focusBorder, #3B6CF6);--mlv-canvas-dot: var(--vscode-widget-border, #E6E9F0);--mlv-edge: color-mix(in srgb, var(--mlv-text) 64%, var(--mlv-bg));--mlv-node-edge: color-mix(in srgb, var(--mlv-text) 58%, var(--mlv-bg));--mlv-scrim: rgba(16, 18, 24, .36);--mlv-phase-0: #00796B;--mlv-phase-1: #6A4FB3;--mlv-phase-2: #0A693C;--mlv-phase-3: #A0388F;--mlv-phase-4: #558B2F;--mlv-phase-5: #0B7F99;--mlv-phase-6: #546E7A;--mlv-phase-7: #1F6FB2;--mlv-stage-unknown: #7A8090;--mlv-lane-tint: .025;--mlv-group-tint: 0;--mlv-sev-high: var(--vscode-editorError-foreground, var(--vscode-charts-red, #D0342C));--mlv-sev-medium: var(--vscode-editorWarning-foreground, var(--vscode-charts-yellow, #E8A317));--mlv-sev-low: var(--vscode-editorInfo-foreground, var(--vscode-charts-blue, #2F5FD0));--mlv-sev-high-ink: var(--vscode-editor-background, #FFFFFF);--mlv-sev-medium-ink: #3A2500;--mlv-sev-low-ink: var(--vscode-editor-background, #FFFFFF)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]):not([data-theme=hc]),.mlv-root:not([data-theme=light]):not([data-theme=hc]){--mlv-bg: var(--vscode-editor-background, #131417);--mlv-surface: var(--vscode-editorWidget-background, #1A1C21);--mlv-surface-2: var(--vscode-list-hoverBackground, #22252C);--mlv-border: var(--vscode-widget-border, #2C3038);--mlv-border-strong: var(--vscode-widget-border, #3B414C);--mlv-text: var(--vscode-editor-foreground, #E6E8EE);--mlv-text-2: var(--vscode-descriptionForeground, #9AA1B1);--mlv-text-3: var(--vscode-descriptionForeground, #969DAD);--mlv-link: var(--vscode-textLink-foreground, #8FB0FF);--mlv-accent: var(--vscode-focusBorder, #6E96FF);--mlv-accent-solid: var(--vscode-button-background, #3355C4);--mlv-on-accent: var(--vscode-button-foreground, #FFFFFF);--mlv-focus: var(--vscode-focusBorder, #6E96FF);--mlv-canvas-dot: var(--vscode-widget-border, #23262D);--mlv-edge: color-mix(in srgb, var(--mlv-text) 54%, var(--mlv-bg));--mlv-node-edge: color-mix(in srgb, var(--mlv-text) 46%, var(--mlv-bg));--mlv-scrim: rgba(0, 0, 0, .5);--mlv-sh-1: 0 1px 2px rgba(0, 0, 0, .36), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 6px 16px rgba(0, 0, 0, .44), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 20px 48px rgba(0, 0, 0, .55), 0 0 0 1px var(--mlv-border-strong);--mlv-phase-0: #4DB6AC;--mlv-phase-1: #A48BE0;--mlv-phase-2: #4CA871;--mlv-phase-3: #D684C5;--mlv-phase-4: #9CCC65;--mlv-phase-5: #4FC3D9;--mlv-phase-6: 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var(--vscode-textLink-foreground, #8FB0FF);--mlv-accent: var(--vscode-focusBorder, #6E96FF);--mlv-accent-solid: var(--vscode-button-background, #3355C4);--mlv-on-accent: var(--vscode-button-foreground, #FFFFFF);--mlv-focus: var(--vscode-focusBorder, #6E96FF);--mlv-canvas-dot: var(--vscode-widget-border, #23262D);--mlv-edge: color-mix(in srgb, var(--mlv-text) 54%, var(--mlv-bg));--mlv-node-edge: color-mix(in srgb, var(--mlv-text) 46%, var(--mlv-bg));--mlv-scrim: rgba(0, 0, 0, .5);--mlv-sh-1: 0 1px 2px rgba(0, 0, 0, .36), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 6px 16px rgba(0, 0, 0, .44), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 20px 48px rgba(0, 0, 0, .55), 0 0 0 1px var(--mlv-border-strong);--mlv-phase-0: #4DB6AC;--mlv-phase-1: #A48BE0;--mlv-phase-2: #4CA871;--mlv-phase-3: #D684C5;--mlv-phase-4: #9CCC65;--mlv-phase-5: #4FC3D9;--mlv-phase-6: #90A4AE;--mlv-phase-7: #6FA8DC;--mlv-stage-unknown: #8B93A7;--mlv-lane-tint: .035;--mlv-group-tint: 0;--mlv-sev-high: 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diff --git a/vscode-extension/media/mlview.js b/vscode-extension/media/mlview.js
index 1bd3eb53..c67fe9e2 100644
--- a/vscode-extension/media/mlview.js
+++ b/vscode-extension/media/mlview.js
@@ -1,9 +1,9 @@
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s.edgeIds)for(let[a,d]of n.edgeEls())(d.getAttribute("data-edge-ids")||a).split(" ").indexOf(l)>=0&&d.classList.add("is-selected");Bl(n.connectors,o,i,n.collapsed(),s)}hoverIntent(e){if(this.hoverTimer!==null){if(this.pendingHover===e)return;clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null}if(this.hoverId===e)return;let n=e?400:120;if(n<=0){this.setHover(e);return}this.pendingHover=e,this.hoverTimer=setTimeout(()=>{this.hoverTimer=null,this.pendingHover=null,this.setHover(e)},n)}setHover(e){if(this.hoverId===e||(this.hoverId=e,this.focusLocked))return;let n=this.ctx;if(!e){this.trace(null,"is-tracing","direct"),n.tooltip.hide(),n.flow.stop(),n.syncBundles();return}this.trace(e,"is-tracing","direct"),n.flow.stream(e,"direct"),n.syncBundles();let o=n.index(),i=n.frame();if(!o||!i)return;let s=i.boxes.get(e);s&&n.tooltip.showNode(o,e,s,r=>n.keep(r))}trace(e,n,o){let i=this.ctx;pl({nodes:i.nodeEls(),edges:i.edgeEls(),canvas:i.canvas},i.routes(),e,n,o),i.syncBundles()}toggleFocusMode(e){let n=this.ctx;if(this.focusLocked){this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,n.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),n.flow.clear(),n.syncBundles(),n.announce("Focus mode off.");let o=this.hoverId;o&&(this.hoverId=null,this.setHover(o));return}if(!e||e.kind!=="node"){n.toast("Select a node first, then press F to focus.");return}this.focusLocked=!0,this.focusNodeId=e.id,this.retraceFocus(),this.focusLocked&&(n.flow.stream(this.focusShown??e.id,"lineage"),n.announce("Focus mode on."))}destroy(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null)}};function Dl(t,e,n,o){let i=n?t.querySelector(".mlv-group__header"):t;if(!i)return;let s=t.querySelector(".mlv-group__chevron-btn");s&&(k(s,"click",d=>{d.preventDefault(),d.stopPropagation(),o.isGroup(e)&&o.toggleCollapse(e)}),k(s,"dblclick",d=>{d.preventDefault(),d.stopPropagation()}));let r=n||o.isGroup(e),l=null,a=()=>{l!==null&&(clearTimeout(l),l=null)};o.addDisposer(a),k(i,"click",d=>{if(d.stopPropagation(),!r){o.activateNode(e,d);return}a(),l=setTimeout(()=>{l=null,o.activateNode(e)},220)}),k(i,"dblclick",d=>{d.preventDefault(),d.stopPropagation(),a(),o.isGroup(e)?o.toggleCollapse(e):r||o.openNode(e,!1)}),k(i,"pointerenter",()=>o.hoverIntent(e)),k(i,"pointerleave",()=>o.hoverIntent(null)),k(i,"keydown",d=>{d.key==="Enter"&&!d.ctrlKey&&!d.metaKey&&!d.shiftKey?(d.preventDefault(),d.stopPropagation(),o.openNode(e,d.altKey)):d.key===" "&&o.isGroup(e)&&(d.preventDefault(),d.stopPropagation(),o.toggleCollapse(e))})}function jl(t,e,n){let o=t.querySelector(".mlv-edge__hit");if(!o)return;let i=o;k(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),k(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),k(i,"pointerenter",()=>n.enterEdge(e)),k(i,"pointerleave",()=>n.leaveEdge(e)),k(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),k(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),k(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Pn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new bn;this.mountSerial=Ls();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new Rn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new Mn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new On,this.canvasEl.appendChild(this.toasts.root),this.viewport=new _n(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Fl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new An({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new Nn({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Cn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new Set(e)}get minimapCollapsed(){return this.minimap.collapsed}setMinimapCollapsed(e){this.minimap.setCollapsed(e)}setPanelWidth(e){e>0&&this.minimap.root.classList.toggle("is-narrow",e<=900)}minimapUnavailable(){let e=this.minimap.root;return e.hidden?"Shown when "+30+" or more cards are drawn":e.classList.contains("is-narrow")?"No room in a panel "+900+" px wide or narrower":e.classList.contains("is-short")?"No room in a canvas under "+350+" px tall":null}setStale(e){this.staleFiles=new Map(e.map(n=>[n.path,n.reason]))}nodeElement(e){return this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=Dr(this.index,this.collapsedSet),this.routes=Kr(this.index,this.frameData,this.collapsedSet),this.labelPlan=_s(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?kn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=ll({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,l)=>Dl(s,r,l,n),wireEdge:(s,r)=>jl(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,So(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=al(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(Il(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(Al(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,l=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+l+(l===1?" step":" steps")+" hidden.":" expanded."))}overview(){if(!this.index)return 0;let e=[];for(let n of this.index.graph.nodes||[])this.index.isGroup(n.id)&&e.push(n.id);return this.collapsedSet=new Set(e),this.relayout(),this.viewport.fitWhole(),this.host.afterCollapse(),this.host.announce("Overview: "+e.length+(e.length===1?" group":" groups")+" collapsed, whole diagram fitted."),e.length}expandAncestors(e){if(!this.index)return!1;let n=!1;for(let o of this.index.ancestors(e))this.collapsedSet.delete(o)&&(n=!0);return n&&this.relayout(),n}centerOnNode(e,n){if(!this.index||!this.frameData)return;let o=this.index.visibleRepresentative(e,this.collapsedSet),i=this.frameData.boxes.get(o);if(!i||(this.viewport.centerOn(i),!n))return;let s=this.nodeEls.get(o);s&&(s.classList.add("is-pulse"),setTimeout(()=>s.classList.remove("is-pulse"),700))}revealNode(e,n){if(!this.index||!this.frameData)return;let o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Le){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else r&&(l=this.edgeEls.get(r)?.querySelector(".mlv-edge__hit"));if(l)try{l.focus()}catch{}}frameIssue(e){if(!this.index||!this.frameData)return;let n=this.index.issueById.get(e);if(!n)return;let o=[],i=[];for(let d of n.nodeIds){let c=this.targetRect({kind:"node",id:d});c&&o.push(c)}for(let d of n.edgeIds){let c=this.targetRect({kind:"edge",id:d});c&&i.push(c)}let s=o.concat(i);if(!s.length)return;let r=d=>{let c=Math.min(...d.map(h=>h.x)),u=Math.min(...d.map(h=>h.y));return{x:c,y:u,w:Math.max(...d.map(h=>h.x+h.w))-c,h:Math.max(...d.map(h=>h.y+h.h))-u}},l=r(s),a=!o.length||!i.length||this.viewport.fitsAt(l,Sn)?l:r(o);this.viewport.frameRect(a,s[0],At),n.nodeIds[0]&&this.pulseNode(this.index.visibleRepresentative(n.nodeIds[0],this.collapsedSet))}revealEdge(e){let n=this.targetRect({kind:"edge",id:e});n&&(this.viewport.vp.zoomn.classList.remove("is-pulse"),700))}zoomStep(e){let n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Ur(this.index,this.frameData,o,n):ti(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Vl='button, [role="button"], a[href], select';function ql(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var rt=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(k(e,"keydown",o=>this.onKey(o))),this.disposers.push(k(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Vl),n=ql(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function Ge(t,e=fi()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Kl=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"review",label:"Review the claims",icon:"review",keys:"R",group:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Ul=["svg","png","copy-svg"],Ep=0,Fn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Ep;this.button=ne("mlv-btn 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this.focusLocked}resetHover(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null),this.pendingHover=null,this.hoverId=null,this.trace(null,"is-tracing","direct"),this.ctx.tooltip.hide(),this.retraceFocus()}retraceFocus(){if(!this.focusLocked||!this.focusNodeId)return;let e=this.ctx,n=e.index(),o=n&&n.nodeById.has(this.focusNodeId)?n.visibleRepresentative(this.focusNodeId,e.collapsed()):null;if(o&&e.nodeEls().has(o)){this.focusShown=o,e.canvas.classList.remove("is-tracing"),this.trace(o,"is-focusing","lineage");return}this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,e.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),e.announce("Focus mode off.")}applySelection(e){let n=this.ctx;for(let o of n.nodeEls().values())o.classList.remove("is-selected");for(let o of 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s.edgeIds)for(let[l,d]of n.edgeEls())(d.getAttribute("data-edge-ids")||l).split(" ").indexOf(a)>=0&&d.classList.add("is-selected");Hl(n.connectors,o,i,n.collapsed(),s)}hoverIntent(e){if(this.hoverTimer!==null){if(this.pendingHover===e)return;clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null}if(this.hoverId===e)return;let n=e?400:120;if(n<=0){this.setHover(e);return}this.pendingHover=e,this.hoverTimer=setTimeout(()=>{this.hoverTimer=null,this.pendingHover=null,this.setHover(e)},n)}setHover(e){if(this.hoverId===e||(this.hoverId=e,this.focusLocked))return;let n=this.ctx;if(!e){this.trace(null,"is-tracing","direct"),n.tooltip.hide(),n.flow.stop(),n.syncBundles();return}this.trace(e,"is-tracing","direct"),n.flow.stream(e,"direct"),n.syncBundles();let o=n.index(),i=n.frame();if(!o||!i)return;let s=i.boxes.get(e);s&&n.tooltip.showNode(o,e,s,r=>n.keep(r))}trace(e,n,o){let i=this.ctx;ml({nodes:i.nodeEls(),edges:i.edgeEls(),canvas:i.canvas},i.routes(),e,n,o),i.syncBundles()}toggleFocusMode(e){let n=this.ctx;if(this.focusLocked){this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,n.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),n.flow.clear(),n.syncBundles(),n.announce("Focus mode off.");let o=this.hoverId;o&&(this.hoverId=null,this.setHover(o));return}if(!e||e.kind!=="node"){n.toast("Select a node first, then press F to focus.");return}this.focusLocked=!0,this.focusNodeId=e.id,this.retraceFocus(),this.focusLocked&&(n.flow.stream(this.focusShown??e.id,"lineage"),n.announce("Focus mode on."))}destroy(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null)}};function Nl(t,e,n,o){let i=n?t.querySelector(".mlv-group__header"):t;if(!i)return;let s=t.querySelector(".mlv-group__chevron-btn");s&&(_(s,"click",d=>{d.preventDefault(),d.stopPropagation(),o.isGroup(e)&&o.toggleCollapse(e)}),_(s,"dblclick",d=>{d.preventDefault(),d.stopPropagation()}));let r=n||o.isGroup(e),a=null,l=()=>{a!==null&&(clearTimeout(a),a=null)};o.addDisposer(l),_(i,"click",d=>{if(d.stopPropagation(),!r){o.activateNode(e,d);return}l(),a=setTimeout(()=>{a=null,o.activateNode(e)},220)}),_(i,"dblclick",d=>{d.preventDefault(),d.stopPropagation(),l(),o.isGroup(e)?o.toggleCollapse(e):r||o.openNode(e,!1)}),_(i,"pointerenter",()=>o.hoverIntent(e)),_(i,"pointerleave",()=>o.hoverIntent(null)),_(i,"keydown",d=>{d.key==="Enter"&&!d.ctrlKey&&!d.metaKey&&!d.shiftKey?(d.preventDefault(),d.stopPropagation(),o.openNode(e,d.altKey)):d.key===" "&&o.isGroup(e)&&(d.preventDefault(),d.stopPropagation(),o.toggleCollapse(e))})}function Fl(t,e,n){let o=t.querySelector(".mlv-edge__hit");if(!o)return;let i=o;_(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),_(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),_(i,"pointerenter",()=>n.enterEdge(e)),_(i,"pointerleave",()=>n.leaveEdge(e)),_(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),_(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),_(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var eo=class{constructor(e,n){this.overviewReturn=null;this.panelWidth=0;this.indexFolded=!1;this.indexHidden=!1;this.arrowLane=null;this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new Tn;this.mountSerial=cr();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new Zn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.phaseIndex=new Wn({go:i=>this.goToPhase(i,{focusCanvas:!0}),fold:i=>{this.indexFolded=i,this.syncPhaseIndex(),this.host.onPhaseIndexChanged()}}),this.canvasEl.appendChild(this.phaseIndex.root),this.overview=new Kn({go:i=>this.goToPhase(i,{focusCanvas:!0}),back:()=>this.closeOverview(!0)}),this.canvasEl.appendChild(this.overview.root),this.toasts=new Qn,this.canvasEl.appendChild(this.toasts.root),this.viewport=new jn(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.phaseIndex.setInView(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)}),this.viewport.setCovered(()=>this.indexCovered());for(let i of Pl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new Un({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new Jn({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Xn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new Set(e)}get phaseIndexFolded(){return this.indexFolded}get phaseIndexHidden(){return this.indexHidden}setPhaseIndex(e){typeof e.folded=="boolean"&&(this.indexFolded=e.folded),typeof e.hidden=="boolean"&&(this.indexHidden=e.hidden),this.syncPhaseIndex()}get phaseIndexElement(){return this.phaseIndex.root}phasesInView(){return this.phaseIndex.inView()}setPanelWidth(e){e>0&&(this.panelWidth=e,this.syncPhaseIndex())}phaseIndexUnavailable(){return this.phaseIndex.available?null:"Shown when the diagram has two or more phases"}closePhasePopover(){return this.phaseIndex.closePopover()}syncPhaseIndex(){let e=this.canvasEl.getBoundingClientRect().height,n=!(this.panelWidth>0)||this.panelWidth>=1e3,o=!(e>0)||e>=350;this.phaseIndex.setMode({roomy:n&&o,folded:this.indexFolded,hidden:this.indexHidden,suppressed:this.overview.open})}indexCovered(){let e=this.canvasEl.getBoundingClientRect(),n=this.viewport.size();return this.phaseIndex.coveredRect(n.w,n.h,e.width>0?e.left:0,e.width>0?e.top:0)}renderPhaseIndex(){if(!this.index||!this.frameData)return;let e=this.frameData.lanes.map(o=>({id:o.id,label:o.label,index:this.index.phaseIndexOf(o.id),steps:o.nodeCount,counts:this.index.laneCounts(o.id,i=>this.host.keep(i)),rect:{x:o.x,y:o.y,w:o.w,h:o.h}}));this.phaseIndex.setRows(e),this.syncPhaseIndex();let n=this.viewport.size();this.phaseIndex.setInView(this.viewport.vp,n.w,n.h)}get overviewOpen(){return this.overview.open}get overviewElement(){return this.overview.root}overviewLayout(){return this.overview.layout}openOverview(){if(!this.index||!this.frameData||this.overview.open||!this.index.lanes.length)return!1;let e=this.canvasEl.ownerDocument,n=e?e.activeElement:null;this.overviewReturn=n&&n!==e.body?n:null,this.tooltip.hide();let o=Vn(this.index,l=>this.host.keep(l)),i=this.viewport.size(),s=this.phaseIndex.currentPhase(),r=Math.max(0,o.phases.findIndex(l=>l.id===s));this.overview.show(o,i.w,i.h,r),this.syncPhaseIndex();let a=o.phases.length;return this.host.announce("Phase overview: "+a+(a===1?" phase":" phases")+", "+o.totalSteps+(o.totalSteps===1?" step":" steps")+". Arrow keys move between phases, Enter goes to one, Escape goes back."),!0}closeOverview(e){if(!this.overview.open)return!1;let n=this.canvasEl.ownerDocument,o=!!n&&!!n.activeElement&&this.overview.root.contains(n.activeElement);this.overview.hide(),this.syncPhaseIndex();let i=this.overviewReturn;return this.overviewReturn=null,e?(this.host.announce("Back to the diagram."),o&&this.focusSafely(i&&i.isConnected&&!this.overview.root.contains(i)?i:this.canvasEl)):o&&this.focusSafely(this.canvasEl),!0}toggleOverview(){this.overview.open?this.closeOverview(!0):this.openOverview()}goToPhase(e,n={}){if(!this.index||!this.frameData)return;let o=this.frameData.lanes.findIndex(l=>l.id===e);if(o<0)return;let i=this.closeOverview(!1),s=this.viewport.size(),r=Ja(this.frameData,o,s.w,s.h);r&&this.viewport.animateTo({x:r.x,y:r.y,zoom:r.zoom}),this.arrowLane=e;let a=this.frameData.lanes[o];this.host.announce("Phase "+(this.index.phaseIndexOf(e)+1)+": "+a.label+", "+a.nodeCount+(a.nodeCount===1?" step":" steps")+"."),(n.focusCanvas||i)&&this.focusSafely(this.canvasEl)}takeArrowLane(){let e=this.arrowLane;return this.arrowLane=null,e}clearArrowLane(){this.arrowLane=null}focusSafely(e){try{e.focus()}catch{}}setStale(e){this.staleFiles=new Map(e.map(n=>[n.path,n.reason]))}nodeElement(e){return this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=Ea(this.index,this.collapsedSet),this.routes=Aa(this.index,this.frameData,this.collapsedSet),this.labelPlan=lr(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?Nn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=Va({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,a)=>Nl(s,r,a,n),wireEdge:(s,r)=>Fl(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,Xo(s));if(this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderPhaseIndex(),this.renderEmptyState(),this.overview.open&&this.index){let s=this.viewport.size();this.overview.redraw(Vn(this.index,r=>this.host.keep(r)),s.w,s.h)}}syncShortCanvas(){if(this.syncPhaseIndex(),this.overview.open&&this.index){let e=this.viewport.size();this.overview.redraw(Vn(this.index,n=>this.host.keep(n)),e.w,e.h)}}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(Sl(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(Ml(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,a=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+a+(a===1?" step":" steps")+" hidden.":" 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zn({onTab:n=>t.setRailTab(n),onClearFilters:()=>t.clearFilters(),onSelectIssue:(n,o)=>{t.focusIssue(n,{fromList:"issues"}),t.doubleClick.arm(o,()=>t.openIssue(n,!1))},onOpenIssue:(n,o)=>t.openIssue(n,o),onSelectNode:(n,o)=>{t.select({kind:"node",id:n},{center:!0,reveal:!0,fromList:"outline"}),t.doubleClick.arm(o,()=>t.select({kind:"node",id:n},{center:!0,reveal:!0,open:!0,fromList:"outline"}))},onOpenNode:(n,o)=>t.select({kind:"node",id:n},{center:!0,reveal:!0,open:!0,focusEditor:o,fromList:"outline"}),onSelectEdge:n=>t.select({kind:"edge",id:n},{reveal:!0,fromList:"outline"}),onShowNode:n=>t.focusNode(n,{center:!0,pulse:!0}),onShowEdge:n=>t.select({kind:"edge",id:n},{reveal:!0}),onShowIssue:n=>t.focusIssue(n),onChallenge:()=>ad(t,"challenge"),onRefine:()=>ad(t,null),onOpen:(n,o)=>{t.walk.openQuote(n,!!o)||t.openLocation(n,o)},onResize:n=>t.setRailWidth(n),onSelectLane:n=>t.selectLane(n),onToggleCollapse:n=>{t.index&&t.index.isGroup(n)&&t.view.toggleCollapse(n)},onShowLimitations:()=>t.showAbout({at:"limitations",focus:!0}),onSheetToggle:()=>t.toggleRail(),onSheetCollapse:()=>{t.walk.stop()?Xi(t):t.collapseSheet(!0)},onSheetResize:n=>t.setSheetFraction(n),sheetFraction:()=>t.sheetFraction,sheetFractionMax:()=>t.sheetFractionMax(),bodyHeight:()=>e.body.getBoundingClientRect().height}),e.body.appendChild(t.rail.root),k(t.rail.root,"pointerdown",()=>{t.railChosen=!0}),k(t.rail.root,"keydown",()=>{t.railChosen=!0}),t.legend=new 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this.timer!==null}flushOpen(){this.timer!==null&&(this.cancelTimer(),this.sendOpen(!1))}sendOpen(e){if(!this.active)return;let n=this.currentLocs(),o=n[Math.min(this.quote,n.length-1)];if(!o){this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("none"),this.render();return}if(!this.app.caps.canOpenSource){this.status=this.statusFor("unavailable"),this.render();return}let i=++this.seq;this.latestSeq=i,this.remember(),this.app.bridge.saveState(this.app.getState());let s=Yi(o);s.walk=!0,s.seq=i,e&&(s.focus=!0),this.app.postRequest(s,l=>this.onResult(l,i));let r=this.localBlock(o);this.status=r?this.statusFor("blocked",r):this.statusFor("opening"),this.render()}show(e){let n=this.current();if(n){this.selecting=!0;try{this.app.showWalkClaim(n)}finally{this.selecting=!1}e?this.scheduleOpen():this.status=this.statusFor(this.currentLocs().length?this.app.caps.canOpenSource?"idle":"unavailable":"none"),this.remember(),this.render(),this.app.announce(this.announcement()),this.app.saveSoon()}}announcement(){let e=this.index(),n=this.current();return e&&n?aa(this.position,this.list.length,this.filter,e,n):""}render(e=!1){this.app.renderWalkBar(),Ei(this.app.rail.root,this.paneMark(),e)}paneMark(){if(!this.active)return null;let e=this.current();return!e||!le(e,this.app.selection)?null:{quote:this.status.quote,status:this.status}}remember(){let e=this.app.workflowRevision,n=this.current();if(!e||!n)return;let o={filter:this.filter,claim:{kind:n.kind,id:n.id}};this.quote>0&&(o.quote=this.quote),this.active&&(o.active=!0),this.remembered={revision:e,state:o}}viewState(){let e=this.app.workflowRevision;if(!this.remembered||!e||this.remembered.revision!==e)return;let n={...this.remembered.state,claim:{...this.remembered.state.claim}};return this.active?n.active=!0:delete n.active,n}restore(e,n){let o=Pg(n);this.restored=o?{revision:e,state:o}:null}destroy(){this.cancelTimer()}};var Fg=32,Zi=900,Bg=620,Dg=.47,vd=.25,bd=.75,io=class{constructor(e,n){this.graph=null;this.index=null;this.edgeAnchor=null;this.flowOn=!0;this.exceptionsOn=!1;this.filters=new Wt;this.viewportState={x:0,y:0,zoom:1};this.selection=null;this.collapsedState=[];this.railTab="about";this.legendOpen=!1;this.freshness=new Gt;this.openHintShown=!1;this.railOpen=!0;this.railChosen=!1;this.dockedHidden=!1;this.railWidth=360;this.railMode="docked";this.sheetFraction=Dg;this.paneColumns=1;this.workflowDocument=null;this.workflowRevision=null;this.restoredView=null;this.restoredComposer=null;this.restoredTab=null;this.restoredSelection=null;this.restoredSheet=null;this.pending=new Map;this.requestSerial=0;this.disposers=[];this.destroyed=!1;this.releasePage=()=>{};this.saveSoon=$i(()=>this.bridge.saveState(this.getState()),250);this.root=e,this.bridge=n,this.caps=n.capabilities,this.themes=new zt(e,n.theme||"light"),this.doubleClick=new on(e),this.disposers.push(()=>this.doubleClick.dispose()),this.walk=new oo(this),dd(this);let o=md(n);o&&no(this,o,!1),o&&typeof o.workflowRevision=="string"&&o.viewport&&(this.restoredView={revision:o.workflowRevision,viewport:{...o.viewport}});let i=o&&typeof o.workflowRevision=="string"?Ns(o.composer):null;o&&i&&(this.restoredComposer={revision:o.workflowRevision,composer:i});let s=o&&typeof o.workflowRevision=="string"?to(o.railTab):null;o&&s&&(this.restoredTab={revision:o.workflowRevision,tab:s});let r=o&&typeof o.workflowRevision=="string"?eo(o.selection):null;o&&r&&(this.restoredSelection={revision:o.workflowRevision,selection:r}),o&&typeof o.workflowRevision=="string"&&o.sheetOpen===!0&&(this.restoredSheet=o.workflowRevision),o&&typeof o.workflowRevision=="string"&&this.walk.restore(o.workflowRevision,o.walk),this.disposers.push(n.onMessage(l=>this.onMessage(l))),typeof window<"u"&&this.disposers.push(k(window,"resize",()=>this.onResize())),this.disposers.push(k(e,"keydown",l=>{l.defaultPrevented||!(l.ctrlKey||l.metaKey)||l.altKey||l.key!=="f"&&l.key!=="F"||this.modalOpen(l.target)||(l.preventDefault(),this.focusSearch())})),this.disposers.push(k(e,"keydown",l=>{l.key!=="Escape"||l.defaultPrevented||!this.walk.active||this.modalOpen(l.target)||this.walk.stop()&&l.preventDefault()})),this.chrome.setWidth(this.rootWidth()),this.view.setPanelWidth(this.rootWidth())}rootWidth(){let e=this.root.getBoundingClientRect().width;return e>0?e:0}onResize(){let e=this.chrome.headerLayout;this.chrome.setWidth(this.rootWidth())!==e&&(K(this),this.renderWalkBar()),this.view.setPanelWidth(this.rootWidth()),this.autoRail(),this.paneColumns!==this.selectionColumns()&&U(this)}selectionColumns(){return this.railMode==="sheet"&&this.rootWidth()>=Bg?2:1}railShown(){return this.railOpen}refreshChrome(){K(this)}focusSearch(){this.chrome.setSearchOpen(!0),this.search.focus()}showAbout(e={}){this.railTab="about",this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon();let n=e.at==="limitations"?this.rail.revealLimitations():e.focus?this.rail.activePanel():null;if(e.focus&&n)try{n.focus()}catch{}this.announce(e.at==="limitations"?"About: the coverage limitations.":"About this revision shown.")}modalOpen(e){if(this.sheet&&this.sheet.open||Mo(this))return!0;let n=e;return!!n&&typeof n.closest=="function"&&!!n.closest(".mlv-sheet, .mlv-workflow__composer")}closeHeaderPanels(){return Lo(this,!0)}headerPanelOpen(){return Mo(this)}setWorkflow(e,n){let o=this.workflowRevision!==e.revision.id,i=n;if(!n||!n.viewport){let r=null;this.graph&&this.workflowRevision===e.revision.id?r={...this.viewportState}:!this.graph&&this.restoredView&&this.restoredView.revision===e.revision.id&&(r={...this.restoredView.viewport}),r&&(i={...n||{},viewport:r})}this.restoredView=null;let s=this.restoredComposer&&this.restoredComposer.revision===e.revision.id?this.restoredComposer.composer:null;if(this.restoredComposer=null,this.workflowRevision!==e.revision.id){let r=!this.graph&&this.restoredTab&&this.restoredTab.revision===e.revision.id?this.restoredTab.tab:null;this.railTab=r||"about"}if(this.restoredTab=null,!this.graph){let r=l=>l===e.revision.id;this.restoredSelection&&r(this.restoredSelection.revision)&&(this.selection=this.restoredSelection.selection),r(this.restoredSheet)&&(this.railChosen=!0,this.railOpen=!0)}this.restoredSelection=null,this.restoredSheet=null,this.workflowDocument=e,this.workflowRevision=e.revision.id,this.autoRail(),ld(this,nn(e),i,!0),Bs(this,e,s),this.legendOtherKinds(),this.view.afterChromeChange(),this.walk.onDocument(o),this.syncNoticeReview()}postRequest(e,n){this.requestSerial+=1;let o="";for(let s=0;s<4;s++)o+=Math.floor(Math.random()*36).toString(36);let i="r"+this.requestSerial.toString(36)+"-"+o;for(this.pending.set(i,n);this.pending.size>Fg;){let s=this.pending.keys().next().value;if(s===void 0)break;this.pending.delete(s)}return this.bridge.post({...e,requestId:i}),i}onActionResult(e){if(!e||typeof e.requestId!="string")return;let n=this.pending.get(e.requestId);n&&(this.pending.delete(e.requestId),n(e))}openLocation(e,n=!1){cd(this,e,n)}setStale(e){this.freshness.set(e)&&(this.view.setStale(this.freshness.list()),this.index&&this.view.refresh(this.selection),K(this),U(this),this.walk.onStale(),this.syncNoticeReview())}showHostNotice(e,n){let o=!!n&&n.length===1&&n[0]==="checking";if(this.freshness.checking!==o&&(this.freshness.checking=o,K(this)),o)return;let i=this.notice.root.hidden;this.notice.update(e,n),this.syncNoticeReview();let s=this.root.querySelector(".mlv-body");s&&this.notice.root.nextSibling!==s&&this.root.insertBefore(this.notice.root,s),this.graph&&i!==this.notice.root.hidden&&this.view.afterChromeChange()}syncNoticeReview(){let e=this.graph&&this.walk.changedOffered()?this.walk.counts().changed:0;this.notice.setReview(e,this.walk.active)}renderWalkBar(){if(!this.walkBar)return;let e=this.walk;if(!e.active){this.walkBar.update(null);return}this.walkBar.update({position:e.position,total:e.list.length,filter:e.filter,counts:e.counts(),offered:e.offered(),status:e.status,narrow:this.chrome.headerLayout==="narrow"})}onWalkShown(e){this.renderWalkBar(),K(this),this.syncNoticeReview(),e||U(this),this.graph&&this.view.afterSheetToggle()}openRailForWalk(){this.railMode!=="docked"||this.railOpen||(this.railChosen=!0,this.setRailOpen(!0))}walkOwns(e){return le(this.walk.current(),e)}showWalkClaim(e){let n=this.index;if(!n)return;let o=r=>{let l=n.edgeById.get(r);l&&(this.view.expandAncestors(l.source),this.view.expandAncestors(l.target))};if(e.kind==="issue"){let r=n.issueById.get(e.id);if(!r)return;for(let l of r.nodeIds)this.view.expandAncestors(l);for(let l of r.edgeIds)o(l)}else e.kind==="node"?this.view.expandAncestors(e.id):o(e.id);this.select(e,{tab:"inspector",showClaim:!0}),e.kind==="issue"?this.view.frameIssue(e.id):this.view.revealTarget({kind:e.kind,id:e.id});let i=this.view.canvasEl,s=i.ownerDocument?i.ownerDocument.activeElement:null;if(s&&s!==i&&i.contains(s))try{i.focus()}catch{}}setMinimapCollapsed(e){this.view.setMinimapCollapsed(e),K(this),this.saveSoon(),this.announce("Overview minimap "+(e?"hidden":"shown")+".")}setLegend(e){this.legendOpen=e,this.legend.setOpen(e),K(this),this.saveSoon()}setRailTab(e){this.railTab=e,this.railMode==="sheet"&&!this.railOpen&&(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon()}showRailTab(e){this.railTab=e,this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon(),this.railMode==="sheet"&&this.rail.focusTab(e)}focusRailTabs(){this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.rail.focusTab(this.railTab)}toggleRail(){this.railChosen=!0,this.railMode==="docked"&&(this.dockedHidden=this.railOpen),this.setRailOpen(!this.railOpen)}collapseSheet(e=!1){if(this.railMode!=="sheet"||!this.railOpen)return!1;if(this.railChosen=!0,this.setRailOpen(!1),this.announce("Bottom panel collapsed."),e)try{this.view.canvasEl.focus()}catch{}return!0}sheetFractionMax(){let e=this.root.querySelector(".mlv-body"),n=e?e.getBoundingClientRect().height:0;if(!(n>0))return bd;let o=Math.min(240,.45*n);return Math.max(vd,Math.min(bd,(n-o)/n))}setSheetFraction(e){let n=Math.max(vd,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Zi?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),U(this),K(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&K(this),e&&this.rail&&U(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Zi>=280?n-Zi:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),K(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),K(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),U(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),this.walk.followSelection(e),n&&n.open)if(this.walk.active&&this.walkOwns(e))this.walk.reopen(!!n.focusEditor);else{let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),U(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(_l()){let n=pa(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),K(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),U(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){fd(this,e)}onMessage(e){gd(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;if(this.walk.active&&this.walkOwns(this.selection)){this.walk.reopen(n);return}let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return pd(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.walk.destroy(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.walkBar.destroy(),this.view.destroy(),this.releasePage(),N(this.root),this.root.classList.remove("mlv-root")}}};var Ft=null;function jg(){if(Ft)return Ft;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Ft=t.acquireVsCodeApi()}catch{Ft=null}return Ft}function Gg(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function Wg(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function yd(){let t=jg(),e={canOpenSource:!0};return{host:"vscode",theme:Gg(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return Wg(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var zg="0.3.0";function Vg(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is 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+`))}),e}function Mg(t,e,n,o){let i=n.index,s=i.inEdges.get(e.id)||[],r=i.outEdges.get(e.id)||[];if(!s.length&&!r.length)return;let a=g(t,f("section","mlv-insp__section mlv-insp__flow"));a.setAttribute("data-section","connections"),a.appendChild(Ve("Connections",ze(s.length+r.length,"connection","connections")));let l=g(a,f("ul","mlv-insp__sentences")),d=(c,u)=>{let h=g(l,f("li"));h.setAttribute("data-direction",u);let m=u==="in"?c.source:c.target;m===e.id?g(h,f("span","","Loops back to this step")):(g(h,f("span","",u==="in"?"Comes from ":"Feeds ")),h.appendChild(it(m,i.nodeById.get(m),o))),g(h,f("span","",": "));let p=U("mlv-link mlv-insp__flow-edge",c.label||"an unlabelled connection","Select the connection "+is(i,c));p.setAttribute("data-edge-id",c.id),_(p,"click",()=>o.onShowEdge(c.id)),h.appendChild(p);let v=c.basis==="inferred"?" (inferred, not observed)":c.basis==="unresolved"?" 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cc(t,e){Vs(e,{init:(n,o)=>{t.caps=o||t.caps,t.setTheme(n),X(t),Q(t)},workflow:n=>{n!==t.workflowDocument&&t.setWorkflow(n)},workflowStatus:n=>yr(t,n),hostNotice:(n,o)=>t.showHostNotice(n,o),stale:n=>t.setStale(n),actionResult:n=>t.onActionResult(n),theme:n=>t.setTheme(n),revealNode:(n,o)=>t.focusNode(n,{center:o,pulse:!0}),revealIssue:n=>t.focusIssue(n),restoreState:n=>xo(t,n,!0),onUnknown:n=>t.bridge.post({v:1,type:"log",level:"debug",message:"ignored unknown message type: "+n})})}var rb=150,ab=100;function lb(t){if(!t||typeof t!="object")return null;let e=t,n=typeof e.filter=="string"&&xt.indexOf(e.filter)>=0?e.filter:null,o=e.claim;if(!n||!o||typeof o!="object"||o.kind!=="node"&&o.kind!=="edge"&&o.kind!=="issue"||typeof o.id!="string"||!o.id)return null;let i={filter:n,claim:{kind:o.kind,id:o.id}},s=e.quote;return typeof s=="number"&&Number.isInteger(s)&&s>0&&s!!this.app.freshness.reasonOf(e);this.app=e}index(){return this.app.index}claims(){let e=this.index();return 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this.active?(this.active=!1,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"end"}),this.remember(),this.app.onWalkShown(!1),e&&this.app.announce("Review ended. r resumes it here."),this.app.saveSoon(),!0):!1}toggle(){this.active?this.stop():this.start()}step(e){if(!this.active||!this.list.length)return!1;let n=Math.max(0,Math.min(this.list.length-1,this.position+e));return n===this.position?(this.app.announce(e>0?"Claim "+this.list.length+" of "+this.list.length+" is the last one.":"Claim 1 of "+this.list.length+" is the first one."),!0):(this.position=n,this.quote=0,this.show(!0),!0)}stepQuote(e){if(!this.active)return!1;let n=this.currentLocs();if(n.length<2)return this.app.announce(n.length?"This claim has one quote.":"This claim cites no lines."),!0;let o=Math.max(0,Math.min(n.length-1,this.quote+e));return o===this.quote?(this.app.announce(e>0?"Quote "+n.length+" of "+n.length+" is the last one.":"Quote 1 of "+n.length+" is the first one."),!0):(this.quote=o,this.app.announce("Quote "+(o+1)+" of "+n.length+": "+Xi(n[o])+"."),this.scheduleOpen(),this.remember(),this.render(!0),this.app.saveSoon(),!0)}jump(e,n){let o=this.index();if(!o)return!1;let i=e;if(!this.active)return this.start(i);let s=this.claims(),r=d=>e==="findings"?d.kind==="issue":We(so(o,d)),a=s.findIndex(d=>pe(d,this.current())),l=null;for(let d=1;d<=s.length;d++){let c=((a<0?n?0:-1:a)+(n?-d:d)+s.length*2)%s.length;if(r(s[c])){l=s[c];break}}return l?(this.list.some(d=>pe(d,l))||(this.filter=i,this.list=this.listFor(i)),this.position=Math.max(0,this.list.findIndex(d=>pe(d,l))),this.quote=0,this.show(!0),!0):(this.app.announce(e==="findings"?"This revision has no findings.":"No claim is marked inferred or unresolved in this revision."),!0)}setFilter(e){if(!this.active||this.offered().indexOf(e)<0)return;let n=this.current();this.filter=e,this.list=this.listFor(e),this.position=Math.max(0,kt(this.list,n,this.claims()));let o=pe(n,this.current());o||(this.quote=0),this.show(!o),this.app.announce(Et[e]+": "+this.list.length+(this.list.length===1?" claim. ":" claims. ")+this.announcement())}reopen(e){return!this.active||!this.current()?!1:(this.cancelTimer(),this.sendOpen(e),!0)}openQuote(e,n){if(!this.active||!e.evidenceId)return!1;let o=this.currentLocs().findIndex(i=>i.evidenceId===e.evidenceId);return o<0?!1:(this.quote=o,this.cancelTimer(),this.sendOpen(n),this.remember(),!0)}followSelection(e){if(!this.active||this.selecting||!e)return;let n=this.list.findIndex(o=>pe(o,e));n<0||n===this.position||(this.position=n,this.quote=0,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("idle"),this.remember(),this.render())}onDocument(e){let n=this.app.workflowRevision;e&&(this.active&&this.stop(!1),this.remembered=null,this.list=[],this.position=-1);let o=this.restored;if(this.restored=null,o&&o.revision===n&&!this.remembered){this.remembered={revision:n,state:o.state},o.state.active&&this.resume();return}if(!this.active)return;let i=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,kt(this.list,i,this.claims())),this.render()}resume(){let e=this.remembered?this.remembered.state:null;if(!e)return;let n=this.offered();this.filter=n.indexOf(e.filter)>=0?e.filter:"all",this.list=this.listFor(this.filter),this.list.length&&(this.position=Math.max(0,kt(this.list,e.claim,this.claims())),this.quote=pe(e.claim,this.current())?Math.min(e.quote||0,Math.max(0,this.currentLocs().length-1)):0,this.active=!0,this.app.onWalkShown(!0),this.show(!1))}onStale(){if(!this.active)return;this.offered().indexOf(this.filter)<0&&(this.filter="all");let e=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,kt(this.list,e,this.claims())),this.render()}onResult(e,n){if(!(!this.active||n!==this.latestSeq||e.outcome==="cancelled")){if(e.outcome==="done")this.status=this.statusFor("done");else{let o=e.message||(e.outcome==="blocked"?"Not opened.":"VS Code could not show the file.");this.status=this.statusFor(e.outcome,o),this.app.announce((e.outcome==="blocked"?"Not opened: ":"Failed: ")+o)}this.render()}}cancelTimer(){this.timer!==null&&clearTimeout(this.timer),this.timer=null}statusFor(e,n){let o=this.currentLocs(),i=Math.min(this.quote,Math.max(0,o.length-1)),s={state:e,quote:i,quotes:o.length};return o[i]&&e!=="none"&&e!=="unavailable"&&(s.loc=o[i]),n&&(s.message=n),s}localBlock(e){let n=e.evidenceId?this.app.freshness.reasonOf(e.file):void 0;return n?e.file+": "+me[n]+"; not opened.":null}scheduleOpen(){this.cancelTimer();let e=this.currentLocs(),n=e[Math.min(this.quote,e.length-1)];if(!e.length||!n)this.status=this.statusFor("none");else if(!this.app.caps.canOpenSource)this.status=this.statusFor("unavailable");else{let o=this.localBlock(n);this.status=o?this.statusFor("blocked",o):this.statusFor("opening")}this.status.state!=="unavailable"&&(this.timer=setTimeout(()=>{this.timer=null,this.sendOpen(!1)},rb))}get pendingOpen(){return this.timer!==null}flushOpen(){this.timer!==null&&(this.cancelTimer(),this.sendOpen(!1))}sendOpen(e){if(!this.active)return;let n=this.currentLocs(),o=n[Math.min(this.quote,n.length-1)];if(!o){this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("none"),this.render();return}if(!this.app.caps.canOpenSource){this.status=this.statusFor("unavailable"),this.render();return}let i=++this.seq;this.latestSeq=i,this.remember(),this.app.bridge.saveState(this.app.getState());let s=Ss(o);s.walk=!0,s.seq=i,e&&(s.focus=!0),this.app.postRequest(s,a=>this.onResult(a,i));let r=this.localBlock(o);this.status=r?this.statusFor("blocked",r):this.statusFor("opening"),this.render()}show(e){let n=this.current();if(n){this.selecting=!0;try{this.app.showWalkClaim(n)}finally{this.selecting=!1}e?this.scheduleOpen():this.status=this.statusFor(this.currentLocs().length?this.app.caps.canOpenSource?"idle":"unavailable":"none"),this.remember(),this.render(),this.app.announce(this.announcement()),this.app.saveSoon()}}announcement(){let e=this.index(),n=this.current();return e&&n?nd(this.position,this.list.length,this.filter,e,n):""}render(e=!1){this.app.renderWalkBar(),$i(this.app.rail.root,this.paneMark(),e)}paneMark(){if(!this.active)return null;let e=this.current();return!e||!pe(e,this.app.selection)?null:{quote:this.status.quote,status:this.status}}remember(){let e=this.app.workflowRevision,n=this.current();if(!e||!n)return;let o={filter:this.filter,claim:{kind:n.kind,id:n.id}};this.quote>0&&(o.quote=this.quote),this.active&&(o.active=!0),this.remembered={revision:e,state:o}}viewState(){let e=this.app.workflowRevision;if(!this.remembered||!e||this.remembered.revision!==e)return;let n={...this.remembered.state,claim:{...this.remembered.state.claim}};return this.active?n.active=!0:delete n.active,n}restore(e,n){let o=lb(n);this.restored=o?{revision:e,state:o}:null}destroy(){this.cancelTimer()}};var db=32,Ms=900,cb=620,ub=.47,uc=.25,hc=.75,ko=class{constructor(e,n){this.graph=null;this.index=null;this.edgeAnchor=null;this.flowOn=!0;this.exceptionsOn=!1;this.filters=new tn;this.viewportState={x:0,y:0,zoom:1};this.selection=null;this.collapsedState=[];this.railTab="about";this.legendOpen=!1;this.freshness=new en;this.openHintShown=!1;this.railOpen=!0;this.railChosen=!1;this.dockedHidden=!1;this.railWidth=360;this.railMode="docked";this.sheetFraction=ub;this.paneColumns=1;this.workflowDocument=null;this.workflowRevision=null;this.restoredView=null;this.restoredComposer=null;this.restoredTab=null;this.restoredSelection=null;this.restoredSheet=null;this.pending=new Map;this.requestSerial=0;this.disposers=[];this.destroyed=!1;this.releasePage=()=>{};this.saveSoon=Hs(()=>this.bridge.saveState(this.getState()),250);this.root=e,this.bridge=n,this.caps=n.capabilities,this.themes=new nn(e,n.theme||"light"),this.doubleClick=new vn(e),this.disposers.push(()=>this.doubleClick.dispose()),this.walk=new Eo(this),oc(this);let o=dc(n);o&&xo(this,o,!1),o&&typeof o.workflowRevision=="string"&&o.viewport&&(this.restoredView={revision:o.workflowRevision,viewport:{...o.viewport}});let i=o&&typeof o.workflowRevision=="string"?br(o.composer):null;o&&i&&(this.restoredComposer={revision:o.workflowRevision,composer:i});let s=o&&typeof o.workflowRevision=="string"?yo(o.railTab):null;o&&s&&(this.restoredTab={revision:o.workflowRevision,tab:s});let r=o&&typeof o.workflowRevision=="string"?wo(o.selection):null;o&&r&&(this.restoredSelection={revision:o.workflowRevision,selection:r}),o&&typeof o.workflowRevision=="string"&&o.sheetOpen===!0&&(this.restoredSheet=o.workflowRevision),o&&typeof o.workflowRevision=="string"&&this.walk.restore(o.workflowRevision,o.walk),this.disposers.push(n.onMessage(a=>this.onMessage(a))),typeof window<"u"&&this.disposers.push(_(window,"resize",()=>this.onResize())),this.disposers.push(_(e,"keydown",a=>{a.defaultPrevented||!(a.ctrlKey||a.metaKey)||a.altKey||a.key!=="f"&&a.key!=="F"||this.modalOpen(a.target)||(a.preventDefault(),this.focusSearch())})),this.disposers.push(_(e,"keydown",a=>{a.key!=="Escape"||a.defaultPrevented||!this.walk.active||this.modalOpen(a.target)||this.walk.stop()&&a.preventDefault()})),this.chrome.setWidth(this.rootWidth()),this.view.setPanelWidth(this.rootWidth())}rootWidth(){let e=this.root.getBoundingClientRect().width;return e>0?e:0}onResize(){let e=this.chrome.headerLayout;this.chrome.setWidth(this.rootWidth())!==e&&(X(this),this.renderWalkBar()),this.view.setPanelWidth(this.rootWidth()),this.autoRail(),this.paneColumns!==this.selectionColumns()&&Q(this)}selectionColumns(){return this.railMode==="sheet"&&this.rootWidth()>=cb?2:1}railShown(){return this.railOpen}refreshChrome(){X(this)}focusSearch(){this.chrome.setSearchOpen(!0),this.search.focus()}showAbout(e={}){this.railTab="about",this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.saveSoon();let n=e.at==="limitations"?this.rail.revealLimitations():e.focus?this.rail.activePanel():null;if(e.focus&&n)try{n.focus()}catch{}this.announce(e.at==="limitations"?"About: the coverage limitations.":"About this revision shown.")}modalOpen(e){if(this.sheet&&this.sheet.open||Zo(this))return!0;let n=e;return!!n&&typeof n.closest=="function"&&!!n.closest(".mlv-sheet, .mlv-workflow__composer")}closeHeaderPanels(){return Qo(this,!0)}headerPanelOpen(){return Zo(this)}setWorkflow(e,n){let o=this.workflowRevision!==e.revision.id,i=n;if(!n||!n.viewport){let r=null;this.graph&&this.workflowRevision===e.revision.id?r={...this.viewportState}:!this.graph&&this.restoredView&&this.restoredView.revision===e.revision.id&&(r={...this.restoredView.viewport}),r&&(i={...n||{},viewport:r})}this.restoredView=null;let s=this.restoredComposer&&this.restoredComposer.revision===e.revision.id?this.restoredComposer.composer:null;if(this.restoredComposer=null,this.workflowRevision!==e.revision.id){let r=!this.graph&&this.restoredTab&&this.restoredTab.revision===e.revision.id?this.restoredTab.tab:null;this.railTab=r||"about"}if(this.restoredTab=null,!this.graph){let r=a=>a===e.revision.id;this.restoredSelection&&r(this.restoredSelection.revision)&&(this.selection=this.restoredSelection.selection),r(this.restoredSheet)&&(this.railChosen=!0,this.railOpen=!0)}this.restoredSelection=null,this.restoredSheet=null,this.workflowDocument=e,this.workflowRevision=e.revision.id,o&&this.view.closeOverview(!1),this.autoRail(),tc(this,gn(e),i,!0),xr(this,e,s),this.legendOtherKinds(),this.view.afterChromeChange(),this.walk.onDocument(o),this.syncNoticeReview()}postRequest(e,n){this.requestSerial+=1;let o="";for(let s=0;s<4;s++)o+=Math.floor(Math.random()*36).toString(36);let i="r"+this.requestSerial.toString(36)+"-"+o;for(this.pending.set(i,n);this.pending.size>db;){let s=this.pending.keys().next().value;if(s===void 0)break;this.pending.delete(s)}return this.bridge.post({...e,requestId:i}),i}onActionResult(e){if(!e||typeof e.requestId!="string")return;let n=this.pending.get(e.requestId);n&&(this.pending.delete(e.requestId),n(e))}openLocation(e,n=!1){ic(this,e,n)}setStale(e){this.freshness.set(e)&&(this.view.setStale(this.freshness.list()),this.index&&this.view.refresh(this.selection),X(this),Q(this),this.walk.onStale(),this.syncNoticeReview())}showHostNotice(e,n){let o=!!n&&n.length===1&&n[0]==="checking";if(this.freshness.checking!==o&&(this.freshness.checking=o,X(this)),o)return;let i=this.notice.root.hidden;this.notice.update(e,n),this.syncNoticeReview();let s=this.root.querySelector(".mlv-body");s&&this.notice.root.nextSibling!==s&&this.root.insertBefore(this.notice.root,s),this.graph&&i!==this.notice.root.hidden&&this.view.afterChromeChange()}syncNoticeReview(){let e=this.graph&&this.walk.changedOffered()?this.walk.counts().changed:0;this.notice.setReview(e,this.walk.active)}renderWalkBar(){if(!this.walkBar)return;let e=this.walk;if(!e.active){this.walkBar.update(null);return}this.walkBar.update({position:e.position,total:e.list.length,filter:e.filter,counts:e.counts(),offered:e.offered(),status:e.status,narrow:this.chrome.headerLayout==="narrow"})}onWalkShown(e){this.renderWalkBar(),X(this),this.syncNoticeReview(),e||Q(this),this.graph&&this.view.afterSheetToggle()}openRailForWalk(){this.railMode!=="docked"||this.railOpen||(this.railChosen=!0,this.setRailOpen(!0))}walkOwns(e){return pe(this.walk.current(),e)}showWalkClaim(e){let n=this.index;if(!n)return;let o=r=>{let a=n.edgeById.get(r);a&&(this.view.expandAncestors(a.source),this.view.expandAncestors(a.target))};if(e.kind==="issue"){let r=n.issueById.get(e.id);if(!r)return;for(let a of r.nodeIds)this.view.expandAncestors(a);for(let a of r.edgeIds)o(a)}else e.kind==="node"?this.view.expandAncestors(e.id):o(e.id);this.select(e,{tab:"inspector",showClaim:!0}),e.kind==="issue"?this.view.frameIssue(e.id):this.view.revealTarget({kind:e.kind,id:e.id});let i=this.view.canvasEl,s=i.ownerDocument?i.ownerDocument.activeElement:null;if(s&&s!==i&&i.contains(s))try{i.focus()}catch{}}setPhaseIndexShown(e){this.view.setPhaseIndex({hidden:!e}),X(this),this.saveSoon(),this.announce("Phase index "+(e?"shown":"hidden")+".")}toggleOverview(e=!1){if(this.view.overviewOpen){if(this.view.closeOverview(!0),e)try{this.view.canvasEl.focus()}catch{}}else this.view.openOverview();X(this)}setLegend(e){this.legendOpen=e,this.legend.setOpen(e),X(this),this.saveSoon()}setRailTab(e){this.railTab=e,this.railMode==="sheet"&&!this.railOpen&&(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.saveSoon()}showRailTab(e){this.railTab=e,this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.saveSoon(),this.railMode==="sheet"&&this.rail.focusTab(e)}focusRailTabs(){this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.rail.focusTab(this.railTab)}toggleRail(){this.railChosen=!0,this.railMode==="docked"&&(this.dockedHidden=this.railOpen),this.setRailOpen(!this.railOpen)}collapseSheet(e=!1){if(this.railMode!=="sheet"||!this.railOpen)return!1;if(this.railChosen=!0,this.setRailOpen(!1),this.announce("Bottom panel collapsed."),e)try{this.view.canvasEl.focus()}catch{}return!0}sheetFractionMax(){let e=this.root.querySelector(".mlv-body"),n=e?e.getBoundingClientRect().height:0;if(!(n>0))return hc;let o=Math.min(240,.45*n);return Math.max(uc,Math.min(hc,(n-o)/n))}setSheetFraction(e){let n=Math.max(uc,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Ms?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),Q(this),X(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&X(this),e&&this.rail&&Q(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Ms>=280?n-Ms:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),X(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),X(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.view.clearArrowLane(),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),Q(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),this.walk.followSelection(e),n&&n.open)if(this.walk.active&&this.walkOwns(e))this.walk.reopen(!!n.focusEditor);else{let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),Q(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(Ua()){let n=ld(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),X(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),Q(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){ac(this,e)}onMessage(e){cc(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;if(this.walk.active&&this.walkOwns(this.selection)){this.walk.reopen(n);return}let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return lc(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.walk.destroy(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.walkBar.destroy(),this.view.destroy(),this.releasePage(),B(this.root),this.root.classList.remove("mlv-root")}}};var Zt=null;function hb(){if(Zt)return Zt;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Zt=t.acquireVsCodeApi()}catch{Zt=null}return Zt}function fb(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function pb(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function fc(){let t=hb(),e={canOpenSource:!0};return{host:"vscode",theme:fb(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return pb(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var mb="0.3.0";function gb(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is required");let o=new ko(t,n);return o.setWorkflow(e),o}var vb={vscode(){return fc()}};return Ec(bb);})();
diff --git a/webview/build.mjs b/webview/build.mjs
index 4073567c..3b6f754a 100644
--- a/webview/build.mjs
+++ b/webview/build.mjs
@@ -34,6 +34,8 @@ const CSS_FILES = [
   'edge.css',
   'flow.css',
   'rail.css',
+  // Viewer M3: the phase index and the phase overview, overlays inside the canvas.
+  'overview.css',
   // PERF-04. After `edge.css`, because `.mlv-edge--weighted .mlv-edge__path`
   // has the same specificity as the per-kind stroke rules and has to win on
   // source order.
diff --git a/webview/dist/mlview.css b/webview/dist/mlview.css
index f0e21e3e..a9306416 100644
--- a/webview/dist/mlview.css
+++ b/webview/dist/mlview.css
@@ -1 +1 @@
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var(--vscode-list-hoverBackground, #F3F4F8);--mlv-border: var(--vscode-widget-border, #E3E5EB);--mlv-border-strong: var(--vscode-widget-border, #C9CDD6);--mlv-text: var(--vscode-editor-foreground, #16181D);--mlv-text-2: var(--vscode-descriptionForeground, #5A6070);--mlv-text-3: var(--vscode-descriptionForeground, #676E81);--mlv-link: var(--vscode-textLink-foreground, #2B57C4);--mlv-accent: var(--vscode-focusBorder, #3B6CF6);--mlv-accent-solid: var(--vscode-button-background, #2B57C4);--mlv-on-accent: var(--vscode-button-foreground, #FFFFFF);--mlv-focus: var(--vscode-focusBorder, #3B6CF6);--mlv-canvas-dot: var(--vscode-widget-border, #E6E9F0);--mlv-edge: color-mix(in srgb, var(--mlv-text) 64%, var(--mlv-bg));--mlv-node-edge: color-mix(in srgb, var(--mlv-text) 58%, var(--mlv-bg));--mlv-scrim: rgba(16, 18, 24, .36);--mlv-phase-0: #00796B;--mlv-phase-1: #6A4FB3;--mlv-phase-2: #0A693C;--mlv-phase-3: #A0388F;--mlv-phase-4: #558B2F;--mlv-phase-5: #0B7F99;--mlv-phase-6: #546E7A;--mlv-phase-7: #1F6FB2;--mlv-stage-unknown: #7A8090;--mlv-lane-tint: .025;--mlv-group-tint: 0;--mlv-sev-high: var(--vscode-editorError-foreground, var(--vscode-charts-red, #D0342C));--mlv-sev-medium: var(--vscode-editorWarning-foreground, var(--vscode-charts-yellow, #E8A317));--mlv-sev-low: var(--vscode-editorInfo-foreground, var(--vscode-charts-blue, #2F5FD0));--mlv-sev-high-ink: var(--vscode-editor-background, #FFFFFF);--mlv-sev-medium-ink: #3A2500;--mlv-sev-low-ink: var(--vscode-editor-background, #FFFFFF)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]):not([data-theme=hc]),.mlv-root:not([data-theme=light]):not([data-theme=hc]){--mlv-bg: var(--vscode-editor-background, #131417);--mlv-surface: var(--vscode-editorWidget-background, #1A1C21);--mlv-surface-2: var(--vscode-list-hoverBackground, #22252C);--mlv-border: var(--vscode-widget-border, #2C3038);--mlv-border-strong: var(--vscode-widget-border, #3B414C);--mlv-text: var(--vscode-editor-foreground, #E6E8EE);--mlv-text-2: var(--vscode-descriptionForeground, #9AA1B1);--mlv-text-3: var(--vscode-descriptionForeground, #969DAD);--mlv-link: var(--vscode-textLink-foreground, #8FB0FF);--mlv-accent: var(--vscode-focusBorder, #6E96FF);--mlv-accent-solid: var(--vscode-button-background, #3355C4);--mlv-on-accent: var(--vscode-button-foreground, #FFFFFF);--mlv-focus: var(--vscode-focusBorder, #6E96FF);--mlv-canvas-dot: var(--vscode-widget-border, #23262D);--mlv-edge: color-mix(in srgb, var(--mlv-text) 54%, var(--mlv-bg));--mlv-node-edge: color-mix(in srgb, var(--mlv-text) 46%, var(--mlv-bg));--mlv-scrim: rgba(0, 0, 0, .5);--mlv-sh-1: 0 1px 2px rgba(0, 0, 0, .36), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 6px 16px rgba(0, 0, 0, .44), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 20px 48px rgba(0, 0, 0, .55), 0 0 0 1px var(--mlv-border-strong);--mlv-phase-0: #4DB6AC;--mlv-phase-1: #A48BE0;--mlv-phase-2: #4CA871;--mlv-phase-3: #D684C5;--mlv-phase-4: #9CCC65;--mlv-phase-5: #4FC3D9;--mlv-phase-6: #90A4AE;--mlv-phase-7: #6FA8DC;--mlv-stage-unknown: #8B93A7;--mlv-lane-tint: .035;--mlv-group-tint: 0;--mlv-sev-high: var(--vscode-editorError-foreground, var(--vscode-charts-red, #FF6169));--mlv-sev-medium: var(--vscode-editorWarning-foreground, var(--vscode-charts-yellow, #F2B03C));--mlv-sev-low: var(--vscode-editorInfo-foreground, var(--vscode-charts-blue, #6E96FF));--mlv-sev-high-ink: #1A0405;--mlv-sev-medium-ink: #2A1A00;--mlv-sev-low-ink: #0B1020}}body.vscode-dark,:root[data-theme=dark],.mlv-root[data-theme=dark]{--mlv-bg: var(--vscode-editor-background, #131417);--mlv-surface: var(--vscode-editorWidget-background, #1A1C21);--mlv-surface-2: var(--vscode-list-hoverBackground, #22252C);--mlv-border: var(--vscode-widget-border, #2C3038);--mlv-border-strong: var(--vscode-widget-border, #3B414C);--mlv-text: var(--vscode-editor-foreground, #E6E8EE);--mlv-text-2: var(--vscode-descriptionForeground, #9AA1B1);--mlv-text-3: var(--vscode-descriptionForeground, #969DAD);--mlv-link: var(--vscode-textLink-foreground, #8FB0FF);--mlv-accent: var(--vscode-focusBorder, #6E96FF);--mlv-accent-solid: var(--vscode-button-background, #3355C4);--mlv-on-accent: var(--vscode-button-foreground, #FFFFFF);--mlv-focus: var(--vscode-focusBorder, #6E96FF);--mlv-canvas-dot: var(--vscode-widget-border, #23262D);--mlv-edge: color-mix(in srgb, var(--mlv-text) 54%, var(--mlv-bg));--mlv-node-edge: color-mix(in srgb, var(--mlv-text) 46%, var(--mlv-bg));--mlv-scrim: rgba(0, 0, 0, .5);--mlv-sh-1: 0 1px 2px rgba(0, 0, 0, .36), 0 0 0 1px var(--mlv-border);--mlv-sh-2: 0 6px 16px rgba(0, 0, 0, .44), 0 0 0 1px var(--mlv-border-strong);--mlv-sh-3: 0 20px 48px rgba(0, 0, 0, .55), 0 0 0 1px var(--mlv-border-strong);--mlv-phase-0: #4DB6AC;--mlv-phase-1: #A48BE0;--mlv-phase-2: #4CA871;--mlv-phase-3: #D684C5;--mlv-phase-4: #9CCC65;--mlv-phase-5: #4FC3D9;--mlv-phase-6: #90A4AE;--mlv-phase-7: #6FA8DC;--mlv-stage-unknown: #8B93A7;--mlv-lane-tint: .035;--mlv-group-tint: 0;--mlv-sev-high: 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diff --git a/webview/dist/mlview.js b/webview/dist/mlview.js
index 1bd3eb53..c67fe9e2 100644
--- a/webview/dist/mlview.js
+++ b/webview/dist/mlview.js
@@ -1,9 +1,9 @@
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s.edgeIds)for(let[a,d]of n.edgeEls())(d.getAttribute("data-edge-ids")||a).split(" ").indexOf(l)>=0&&d.classList.add("is-selected");Bl(n.connectors,o,i,n.collapsed(),s)}hoverIntent(e){if(this.hoverTimer!==null){if(this.pendingHover===e)return;clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null}if(this.hoverId===e)return;let n=e?400:120;if(n<=0){this.setHover(e);return}this.pendingHover=e,this.hoverTimer=setTimeout(()=>{this.hoverTimer=null,this.pendingHover=null,this.setHover(e)},n)}setHover(e){if(this.hoverId===e||(this.hoverId=e,this.focusLocked))return;let n=this.ctx;if(!e){this.trace(null,"is-tracing","direct"),n.tooltip.hide(),n.flow.stop(),n.syncBundles();return}this.trace(e,"is-tracing","direct"),n.flow.stream(e,"direct"),n.syncBundles();let o=n.index(),i=n.frame();if(!o||!i)return;let s=i.boxes.get(e);s&&n.tooltip.showNode(o,e,s,r=>n.keep(r))}trace(e,n,o){let i=this.ctx;pl({nodes:i.nodeEls(),edges:i.edgeEls(),canvas:i.canvas},i.routes(),e,n,o),i.syncBundles()}toggleFocusMode(e){let n=this.ctx;if(this.focusLocked){this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,n.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),n.flow.clear(),n.syncBundles(),n.announce("Focus mode off.");let o=this.hoverId;o&&(this.hoverId=null,this.setHover(o));return}if(!e||e.kind!=="node"){n.toast("Select a node first, then press F to focus.");return}this.focusLocked=!0,this.focusNodeId=e.id,this.retraceFocus(),this.focusLocked&&(n.flow.stream(this.focusShown??e.id,"lineage"),n.announce("Focus mode on."))}destroy(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null)}};function Dl(t,e,n,o){let i=n?t.querySelector(".mlv-group__header"):t;if(!i)return;let s=t.querySelector(".mlv-group__chevron-btn");s&&(k(s,"click",d=>{d.preventDefault(),d.stopPropagation(),o.isGroup(e)&&o.toggleCollapse(e)}),k(s,"dblclick",d=>{d.preventDefault(),d.stopPropagation()}));let r=n||o.isGroup(e),l=null,a=()=>{l!==null&&(clearTimeout(l),l=null)};o.addDisposer(a),k(i,"click",d=>{if(d.stopPropagation(),!r){o.activateNode(e,d);return}a(),l=setTimeout(()=>{l=null,o.activateNode(e)},220)}),k(i,"dblclick",d=>{d.preventDefault(),d.stopPropagation(),a(),o.isGroup(e)?o.toggleCollapse(e):r||o.openNode(e,!1)}),k(i,"pointerenter",()=>o.hoverIntent(e)),k(i,"pointerleave",()=>o.hoverIntent(null)),k(i,"keydown",d=>{d.key==="Enter"&&!d.ctrlKey&&!d.metaKey&&!d.shiftKey?(d.preventDefault(),d.stopPropagation(),o.openNode(e,d.altKey)):d.key===" "&&o.isGroup(e)&&(d.preventDefault(),d.stopPropagation(),o.toggleCollapse(e))})}function jl(t,e,n){let o=t.querySelector(".mlv-edge__hit");if(!o)return;let i=o;k(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),k(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),k(i,"pointerenter",()=>n.enterEdge(e)),k(i,"pointerleave",()=>n.leaveEdge(e)),k(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),k(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),k(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var Pn=class{constructor(e,n){this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new bn;this.mountSerial=Ls();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new Rn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.minimap=new Mn((i,s)=>{let r=this.viewport.size();this.viewport.set({x:r.w/2-i*this.viewport.vp.zoom,y:r.h/2-s*this.viewport.vp.zoom})},i=>this.host.onMinimapCollapsed(i)),e.main.insertBefore(this.minimap.root,this.canvasEl),this.toasts=new On,this.canvasEl.appendChild(this.toasts.root),this.viewport=new _n(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.minimap.setViewport(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)});for(let i of Fl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new An({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new Nn({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Cn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new Set(e)}get minimapCollapsed(){return this.minimap.collapsed}setMinimapCollapsed(e){this.minimap.setCollapsed(e)}setPanelWidth(e){e>0&&this.minimap.root.classList.toggle("is-narrow",e<=900)}minimapUnavailable(){let e=this.minimap.root;return e.hidden?"Shown when "+30+" or more cards are drawn":e.classList.contains("is-narrow")?"No room in a panel "+900+" px wide or narrower":e.classList.contains("is-short")?"No room in a canvas under "+350+" px tall":null}setStale(e){this.staleFiles=new Map(e.map(n=>[n.path,n.reason]))}nodeElement(e){return this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=Dr(this.index,this.collapsedSet),this.routes=Kr(this.index,this.frameData,this.collapsedSet),this.labelPlan=_s(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?kn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=ll({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,l)=>Dl(s,r,l,n),wireEdge:(s,r)=>jl(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,So(s));this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderMinimap(),this.renderEmptyState()}renderMinimap(){if(!this.index||!this.frameData)return;let e=al(this.index,this.frameData,n=>this.host.keep(n));this.minimap.render(e,this.frameData.width,this.frameData.height),this.minimap.root.hidden=e.length<30,this.syncShortCanvas()}syncShortCanvas(){let e=this.canvasEl.getBoundingClientRect().height;e>0&&this.minimap.root.classList.toggle("is-short",e<350)}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(Il(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(Al(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,l=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+l+(l===1?" step":" steps")+" hidden.":" expanded."))}overview(){if(!this.index)return 0;let e=[];for(let n of this.index.graph.nodes||[])this.index.isGroup(n.id)&&e.push(n.id);return this.collapsedSet=new Set(e),this.relayout(),this.viewport.fitWhole(),this.host.afterCollapse(),this.host.announce("Overview: "+e.length+(e.length===1?" group":" groups")+" collapsed, whole diagram fitted."),e.length}expandAncestors(e){if(!this.index)return!1;let n=!1;for(let o of this.index.ancestors(e))this.collapsedSet.delete(o)&&(n=!0);return n&&this.relayout(),n}centerOnNode(e,n){if(!this.index||!this.frameData)return;let o=this.index.visibleRepresentative(e,this.collapsedSet),i=this.frameData.boxes.get(o);if(!i||(this.viewport.centerOn(i),!n))return;let s=this.nodeEls.get(o);s&&(s.classList.add("is-pulse"),setTimeout(()=>s.classList.remove("is-pulse"),700))}revealNode(e,n){if(!this.index||!this.frameData)return;let o=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));if(o){if(this.viewport.vp.zoom>=Le){this.centerOnNode(e,n);return}this.viewport.centerOn(o,Math.max(this.viewport.vp.zoom,this.readableZoomFor(o))),n&&this.pulseNode(this.index.visibleRepresentative(e,this.collapsedSet))}}keepInView(e){let n=this.targetRect(e);n&&!this.viewport.isVisible(n)&&this.viewport.centerOn(n)}refresh(e){let n=this.canvasEl.ownerDocument,o=n?n.activeElement:null,i=!!o&&o!==this.canvasEl&&this.canvasEl.contains(o)&&typeof o.closest=="function",s=i&&o.closest("[data-node-id]")?.getAttribute("data-node-id")||null,r=i&&!s&&o.classList.contains("mlv-edge__hit")&&o.closest("[data-edge-id]")?.getAttribute("data-edge-id")||null;this.render(),this.applySelection(e);let l=null;if(s){let a=this.nodeEls.get(s);l=a&&a.classList.contains("mlv-group")?a.querySelector(".mlv-group__header"):a}else r&&(l=this.edgeEls.get(r)?.querySelector(".mlv-edge__hit"));if(l)try{l.focus()}catch{}}frameIssue(e){if(!this.index||!this.frameData)return;let n=this.index.issueById.get(e);if(!n)return;let o=[],i=[];for(let d of n.nodeIds){let c=this.targetRect({kind:"node",id:d});c&&o.push(c)}for(let d of n.edgeIds){let c=this.targetRect({kind:"edge",id:d});c&&i.push(c)}let s=o.concat(i);if(!s.length)return;let r=d=>{let c=Math.min(...d.map(h=>h.x)),u=Math.min(...d.map(h=>h.y));return{x:c,y:u,w:Math.max(...d.map(h=>h.x+h.w))-c,h:Math.max(...d.map(h=>h.y+h.h))-u}},l=r(s),a=!o.length||!i.length||this.viewport.fitsAt(l,Sn)?l:r(o);this.viewport.frameRect(a,s[0],At),n.nodeIds[0]&&this.pulseNode(this.index.visibleRepresentative(n.nodeIds[0],this.collapsedSet))}revealEdge(e){let n=this.targetRect({kind:"edge",id:e});n&&(this.viewport.vp.zoomn.classList.remove("is-pulse"),700))}zoomStep(e){let n=this.viewport.size();this.viewport.zoomAt(e>0?1.2:1/1.2,n.w/2,n.h/2)}fit(){this.viewport.fit()}fitWhole(){this.viewport.fitWhole()}zoomToNode(e){if(!this.index||!this.frameData)return;let n=this.frameData.boxes.get(this.index.visibleRepresentative(e,this.collapsedSet));n&&this.viewport.zoomToBox(n)}nextSelection(e,n){if(!this.index||!this.frameData)return null;let o=e&&this.frameData.boxes.has(e)?e:null,i=o?Ur(this.index,this.frameData,o,n):ti(this.frameData);return i?{id:i.id,visible:this.viewport.isVisible(i)}:null}labelOf(e){let n=this.nodeEls.get(e);return n?n.getAttribute("aria-label"):null}toast(e){this.toasts.show(e)}destroy(){this.emphasis.destroy(),this.edgeHover.destroy();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.flow.destroy(),this.toasts.destroy()}};var Vl='button, [role="button"], a[href], select';function ql(t){return typeof t.getClientRects=="function"&&t.getClientRects().length>0}var rt=class{constructor(e,n="input, textarea"){this.activeIndex=0;this.activeEl=null;this.disposers=[];this.container=e,this.ownStopSelector=n,this.disposers.push(k(e,"keydown",o=>this.onKey(o))),this.disposers.push(k(e,"focusin",o=>{let i=o.target;if(!i||typeof i.closest!="function")return;let r=this.items().indexOf(i);r>=0&&this.setActive(r,!1)})),this.sync()}items(){let e=this.container.querySelectorAll(Vl),n=ql(this.container),o=[];for(let i=0;i=0?s:r>=0?r:this.activeEl?Math.min(this.activeIndex,e.length-1):0;this.activeIndex=l,(s>=0||this.activeEl)&&(this.activeEl=e[l]);for(let a=0;a"u")return!1;let t=navigator,e=t.userAgentData&&t.userAgentData.platform||t.platform||t.userAgent||"";return/mac/i.test(e)}catch{return!1}}function Ge(t,e=fi()){return e?t.replace(/^Mod\+/,"⌘").replace(/^Ctrl\+/,"⌃").replace(/^Alt\+/,"⌥").replace(/^Shift\+/,"⇧"):t.replace(/^Mod\+/,"Ctrl+")}var Kl=[{id:"search",label:"Search steps and findings",icon:"search",keys:"Mod+F",folded:!0},{id:"about",label:"About this revision",icon:"info",folded:!0},{id:"exceptions",label:"Not observed",icon:"notobserved",check:!0,folded:!0},{id:"review",label:"Review the claims",icon:"review",keys:"R",group:!0},{id:"legend",label:"Legend",icon:"legend",keys:"L",check:!0,group:!0},{id:"flow",label:"Connection flow animation",icon:"flow",keys:"A",check:!0},{id:"minimap",label:"Overview map",icon:"minimap",check:!0},{id:"rail",label:"Side panel",icon:"rail",keys:"B",check:!0},{id:"fit",label:"Fit the whole diagram",icon:"fit",group:!0},{id:"zoomsel",label:"Zoom to the selection",icon:"target",keys:"Z"},{id:"svg",label:"Export SVG…",icon:"image",group:!0},{id:"png",label:"Export PNG…",icon:"image"},{id:"copy-svg",label:"Copy SVG",icon:"copy"},{id:"shortcuts",label:"Keyboard shortcuts",icon:"keyboard",keys:"?",group:!0}],Ul=["svg","png","copy-svg"],Ep=0,Fn=class{constructor(e,n=()=>{}){this.items=new Map;this.openState=!1;this.disposers=[];this.onPick=e,this.beforeOpen=n;let o="mlv-more"+ ++Ep;this.button=ne("mlv-btn 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this.focusLocked}resetHover(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null),this.pendingHover=null,this.hoverId=null,this.trace(null,"is-tracing","direct"),this.ctx.tooltip.hide(),this.retraceFocus()}retraceFocus(){if(!this.focusLocked||!this.focusNodeId)return;let e=this.ctx,n=e.index(),o=n&&n.nodeById.has(this.focusNodeId)?n.visibleRepresentative(this.focusNodeId,e.collapsed()):null;if(o&&e.nodeEls().has(o)){this.focusShown=o,e.canvas.classList.remove("is-tracing"),this.trace(o,"is-focusing","lineage");return}this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,e.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),e.announce("Focus mode off.")}applySelection(e){let n=this.ctx;for(let o of n.nodeEls().values())o.classList.remove("is-selected");for(let o of 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s.edgeIds)for(let[l,d]of n.edgeEls())(d.getAttribute("data-edge-ids")||l).split(" ").indexOf(a)>=0&&d.classList.add("is-selected");Hl(n.connectors,o,i,n.collapsed(),s)}hoverIntent(e){if(this.hoverTimer!==null){if(this.pendingHover===e)return;clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null}if(this.hoverId===e)return;let n=e?400:120;if(n<=0){this.setHover(e);return}this.pendingHover=e,this.hoverTimer=setTimeout(()=>{this.hoverTimer=null,this.pendingHover=null,this.setHover(e)},n)}setHover(e){if(this.hoverId===e||(this.hoverId=e,this.focusLocked))return;let n=this.ctx;if(!e){this.trace(null,"is-tracing","direct"),n.tooltip.hide(),n.flow.stop(),n.syncBundles();return}this.trace(e,"is-tracing","direct"),n.flow.stream(e,"direct"),n.syncBundles();let o=n.index(),i=n.frame();if(!o||!i)return;let s=i.boxes.get(e);s&&n.tooltip.showNode(o,e,s,r=>n.keep(r))}trace(e,n,o){let i=this.ctx;ml({nodes:i.nodeEls(),edges:i.edgeEls(),canvas:i.canvas},i.routes(),e,n,o),i.syncBundles()}toggleFocusMode(e){let n=this.ctx;if(this.focusLocked){this.focusLocked=!1,this.focusNodeId=null,this.focusShown=null,n.canvas.classList.remove("is-focusing"),this.trace(null,"is-focusing","lineage"),n.flow.clear(),n.syncBundles(),n.announce("Focus mode off.");let o=this.hoverId;o&&(this.hoverId=null,this.setHover(o));return}if(!e||e.kind!=="node"){n.toast("Select a node first, then press F to focus.");return}this.focusLocked=!0,this.focusNodeId=e.id,this.retraceFocus(),this.focusLocked&&(n.flow.stream(this.focusShown??e.id,"lineage"),n.announce("Focus mode on."))}destroy(){this.hoverTimer!==null&&(clearTimeout(this.hoverTimer),this.hoverTimer=null,this.pendingHover=null)}};function Nl(t,e,n,o){let i=n?t.querySelector(".mlv-group__header"):t;if(!i)return;let s=t.querySelector(".mlv-group__chevron-btn");s&&(_(s,"click",d=>{d.preventDefault(),d.stopPropagation(),o.isGroup(e)&&o.toggleCollapse(e)}),_(s,"dblclick",d=>{d.preventDefault(),d.stopPropagation()}));let r=n||o.isGroup(e),a=null,l=()=>{a!==null&&(clearTimeout(a),a=null)};o.addDisposer(l),_(i,"click",d=>{if(d.stopPropagation(),!r){o.activateNode(e,d);return}l(),a=setTimeout(()=>{a=null,o.activateNode(e)},220)}),_(i,"dblclick",d=>{d.preventDefault(),d.stopPropagation(),l(),o.isGroup(e)?o.toggleCollapse(e):r||o.openNode(e,!1)}),_(i,"pointerenter",()=>o.hoverIntent(e)),_(i,"pointerleave",()=>o.hoverIntent(null)),_(i,"keydown",d=>{d.key==="Enter"&&!d.ctrlKey&&!d.metaKey&&!d.shiftKey?(d.preventDefault(),d.stopPropagation(),o.openNode(e,d.altKey)):d.key===" "&&o.isGroup(e)&&(d.preventDefault(),d.stopPropagation(),o.toggleCollapse(e))})}function Fl(t,e,n){let o=t.querySelector(".mlv-edge__hit");if(!o)return;let i=o;_(i,"click",s=>{s.stopPropagation(),n.activateEdge(e.id,s)}),_(i,"dblclick",s=>{s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,!1)}),_(i,"pointerenter",()=>n.enterEdge(e)),_(i,"pointerleave",()=>n.leaveEdge(e)),_(i,"keydown",s=>{s.key!=="Enter"||s.ctrlKey||s.metaKey||s.shiftKey||(s.preventDefault(),s.stopPropagation(),n.openEdge(e.id,s.altKey))}),_(i,"focus",()=>{t.classList.add("is-hover"),n.syncBundles(),n.pulse(e)}),_(i,"blur",()=>{t.classList.remove("is-hover"),n.syncBundles(),n.stopFlow()})}var eo=class{constructor(e,n){this.overviewReturn=null;this.panelWidth=0;this.indexFolded=!1;this.indexHidden=!1;this.arrowLane=null;this.index=null;this.frameData=null;this.routes=[];this.labelPlan=null;this.collapsedSet=new Set;this.staleFiles=new Map;this.nodeEls=new Map;this.edgeEls=new Map;this.markerPoints=new Map;this.bundles=new Tn;this.mountSerial=cr();this.disposers=[];this.lastArea=null;this.host=n,this.canvasEl=e.canvas,this.worldEl=e.world,this.lanesLayer=e.lanesLayer,this.edgesSvg=e.edgesSvg,this.bundleGroup=e.bundleGroup,this.edgeGroup=e.edgeGroup,this.connectorLayer=e.connectorLayer,this.nodesLayer=e.nodesLayer,this.zoomLevelEl=e.zoomLevel,this.stateHost=e.stateHost,this.tooltip=new Zn(()=>this.viewport.vp,()=>this.viewport.size()),this.canvasEl.appendChild(this.tooltip.root),this.phaseIndex=new Wn({go:i=>this.goToPhase(i,{focusCanvas:!0}),fold:i=>{this.indexFolded=i,this.syncPhaseIndex(),this.host.onPhaseIndexChanged()}}),this.canvasEl.appendChild(this.phaseIndex.root),this.overview=new Kn({go:i=>this.goToPhase(i,{focusCanvas:!0}),back:()=>this.closeOverview(!0)}),this.canvasEl.appendChild(this.overview.root),this.toasts=new Qn,this.canvasEl.appendChild(this.toasts.root),this.viewport=new jn(this.canvasEl,this.worldEl,i=>{this.zoomLevelEl.textContent=Math.round(i.zoom*100)+"%";let s=this.viewport.size();this.phaseIndex.setInView(i,s.w,s.h),this.lastArea=this.viewport.visibleArea(),this.host.onViewportChange(i)}),this.viewport.setCovered(()=>this.indexCovered());for(let i of Pl(this.canvasEl,this.viewport,{onKeyDown:s=>this.host.onKeyDown(s),onBackgroundClick:()=>this.host.onBackgroundClick(),onResize:()=>this.handleResize()}))this.disposers.push(i);let o=typeof window<"u"?window.ResizeObserver:void 0;if(o){let i=new o(()=>this.handleResize());i.observe(this.canvasEl),this.disposers.push(()=>i.disconnect())}this.flow=new Un({canvas:this.canvasEl,edges:()=>this.edgeEls,nodes:()=>this.nodeEls,routes:()=>this.routes,index:()=>this.index,hoverNodeId:()=>this.emphasis.hoverNodeId,lockedNodeId:()=>this.emphasis.lockedNodeId,hoverEdgeId:()=>this.edgeHover.hoveredId,toast:i=>this.toasts.show(i)}),this.emphasis=new Jn({canvas:this.canvasEl,connectors:this.connectorLayer,flow:this.flow,tooltip:this.tooltip,nodeEls:()=>this.nodeEls,edgeEls:()=>this.edgeEls,routes:()=>this.routes,index:()=>this.index,frame:()=>this.frameData,collapsed:()=>this.collapsedSet,syncBundles:()=>this.syncBundles(),keep:i=>this.host.keep(i),announce:i=>this.host.announce(i),toast:i=>this.toasts.show(i)}),this.edgeHover=new Xn({canvas:this.canvasEl,viewport:this.viewport,routes:()=>this.routes,edges:()=>this.edgeEls,markers:()=>this.markerPoints,open:i=>{this.index&&(this.tooltip.showEdge(this.index,i,s=>this.host.keep(s),this.markerPoints.get(i.id)),this.flow.pulse(i))},close:()=>{this.emphasis.hoverNodeId||this.tooltip.hide(),this.flow.stop()},hide:()=>this.tooltip.hide(),changed:()=>this.syncBundles(),openDelayMs:400,closeDelayMs:120}),this.disposers.push(this.edgeHover.wire())}get frame(){return this.frameData}get collapsed(){return this.collapsedSet}setIndex(e){this.index=e}setCollapsed(e){this.collapsedSet=new Set(e)}get phaseIndexFolded(){return this.indexFolded}get phaseIndexHidden(){return this.indexHidden}setPhaseIndex(e){typeof e.folded=="boolean"&&(this.indexFolded=e.folded),typeof e.hidden=="boolean"&&(this.indexHidden=e.hidden),this.syncPhaseIndex()}get phaseIndexElement(){return this.phaseIndex.root}phasesInView(){return this.phaseIndex.inView()}setPanelWidth(e){e>0&&(this.panelWidth=e,this.syncPhaseIndex())}phaseIndexUnavailable(){return this.phaseIndex.available?null:"Shown when the diagram has two or more phases"}closePhasePopover(){return this.phaseIndex.closePopover()}syncPhaseIndex(){let e=this.canvasEl.getBoundingClientRect().height,n=!(this.panelWidth>0)||this.panelWidth>=1e3,o=!(e>0)||e>=350;this.phaseIndex.setMode({roomy:n&&o,folded:this.indexFolded,hidden:this.indexHidden,suppressed:this.overview.open})}indexCovered(){let e=this.canvasEl.getBoundingClientRect(),n=this.viewport.size();return this.phaseIndex.coveredRect(n.w,n.h,e.width>0?e.left:0,e.width>0?e.top:0)}renderPhaseIndex(){if(!this.index||!this.frameData)return;let e=this.frameData.lanes.map(o=>({id:o.id,label:o.label,index:this.index.phaseIndexOf(o.id),steps:o.nodeCount,counts:this.index.laneCounts(o.id,i=>this.host.keep(i)),rect:{x:o.x,y:o.y,w:o.w,h:o.h}}));this.phaseIndex.setRows(e),this.syncPhaseIndex();let n=this.viewport.size();this.phaseIndex.setInView(this.viewport.vp,n.w,n.h)}get overviewOpen(){return this.overview.open}get overviewElement(){return this.overview.root}overviewLayout(){return this.overview.layout}openOverview(){if(!this.index||!this.frameData||this.overview.open||!this.index.lanes.length)return!1;let e=this.canvasEl.ownerDocument,n=e?e.activeElement:null;this.overviewReturn=n&&n!==e.body?n:null,this.tooltip.hide();let o=Vn(this.index,l=>this.host.keep(l)),i=this.viewport.size(),s=this.phaseIndex.currentPhase(),r=Math.max(0,o.phases.findIndex(l=>l.id===s));this.overview.show(o,i.w,i.h,r),this.syncPhaseIndex();let a=o.phases.length;return this.host.announce("Phase overview: "+a+(a===1?" phase":" phases")+", "+o.totalSteps+(o.totalSteps===1?" step":" steps")+". Arrow keys move between phases, Enter goes to one, Escape goes back."),!0}closeOverview(e){if(!this.overview.open)return!1;let n=this.canvasEl.ownerDocument,o=!!n&&!!n.activeElement&&this.overview.root.contains(n.activeElement);this.overview.hide(),this.syncPhaseIndex();let i=this.overviewReturn;return this.overviewReturn=null,e?(this.host.announce("Back to the diagram."),o&&this.focusSafely(i&&i.isConnected&&!this.overview.root.contains(i)?i:this.canvasEl)):o&&this.focusSafely(this.canvasEl),!0}toggleOverview(){this.overview.open?this.closeOverview(!0):this.openOverview()}goToPhase(e,n={}){if(!this.index||!this.frameData)return;let o=this.frameData.lanes.findIndex(l=>l.id===e);if(o<0)return;let i=this.closeOverview(!1),s=this.viewport.size(),r=Ja(this.frameData,o,s.w,s.h);r&&this.viewport.animateTo({x:r.x,y:r.y,zoom:r.zoom}),this.arrowLane=e;let a=this.frameData.lanes[o];this.host.announce("Phase "+(this.index.phaseIndexOf(e)+1)+": "+a.label+", "+a.nodeCount+(a.nodeCount===1?" step":" steps")+"."),(n.focusCanvas||i)&&this.focusSafely(this.canvasEl)}takeArrowLane(){let e=this.arrowLane;return this.arrowLane=null,e}clearArrowLane(){this.arrowLane=null}focusSafely(e){try{e.focus()}catch{}}setStale(e){this.staleFiles=new Map(e.map(n=>[n.path,n.reason]))}nodeElement(e){return this.nodeEls.get(e)}relayout(){this.index&&(this.frameData=Ea(this.index,this.collapsedSet),this.routes=Aa(this.index,this.frameData,this.collapsedSet),this.labelPlan=lr(this.frameData,this.routes),this.viewport.setContent(this.frameData.width,this.frameData.height,this.frameData),this.render())}planInputs(){return!this.index||!this.frameData?null:{index:this.index,frame:this.frameData,routes:this.routes,labels:this.labelPlan?this.labelPlan.placements:null,mountSerial:this.mountSerial,keep:e=>this.host.keep(e),staleFiles:this.staleFiles}}scenePlan(){let e=this.planInputs();return e?Nn(e):null}render(){let e=this.planInputs();if(!e)return;let n=this.nodeWiring(),o=this.edgeWiring(),i=Va({world:this.worldEl,lanes:this.lanesLayer,edgesSvg:this.edgesSvg,bundleGroup:this.bundleGroup,edgeGroup:this.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesLayer},{...e,wireNode:(s,r,a)=>Nl(s,r,a,n),wireEdge:(s,r)=>Fl(s,r,o)});this.nodeEls=i.nodeEls,this.edgeEls=i.edgeEls,this.markerPoints=new Map;for(let s of i.plan.edges)s.severity&&this.markerPoints.set(s.route.id,Xo(s));if(this.bundles.adopt(i.bundleEls,i.plan.bundles.map(s=>s.bundle)),this.syncBundles(),this.emphasis.resetHover(),this.edgeHover.reset(),this.flow.clear(),this.renderPhaseIndex(),this.renderEmptyState(),this.overview.open&&this.index){let s=this.viewport.size();this.overview.redraw(Vn(this.index,r=>this.host.keep(r)),s.w,s.h)}}syncShortCanvas(){if(this.syncPhaseIndex(),this.overview.open&&this.index){let e=this.viewport.size();this.overview.redraw(Vn(this.index,n=>this.host.keep(n)),e.w,e.h)}}handleResize(){let e=this.host.keptTarget(),n=e?this.targetRect(e):null,o=this.lastArea,i=!!(n&&o&&this.viewport.isVisible(n,o));n&&i?(this.viewport.acceptResize(),this.viewport.apply(),this.viewport.isVisible(n)||this.viewport.revealRect(n)):this.viewport.onResize(),this.syncShortCanvas()}afterSheetToggle(){this.viewport.acceptResize(),this.handleResize(),this.lastArea=this.viewport.visibleArea()}afterChromeChange(){this.viewport.refitIfFitted(),this.syncShortCanvas()}renderEmptyState(){let e=this.stateHost.querySelector(".mlv-state--empty");if(e&&this.stateHost.removeChild(e),!this.index)return;let n=this.index.graph;n.nodes.length===0?this.stateHost.appendChild(Sl(n)):this.frameData&&this.frameData.boxes.size===0&&this.stateHost.appendChild(Ml(()=>this.host.clearFilters()))}nodeWiring(){return{isGroup:e=>!!this.index&&this.index.isGroup(e),toggleCollapse:e=>this.toggleCollapse(e),hoverIntent:e=>this.emphasis.hoverIntent(e),activateNode:(e,n)=>this.host.activateNode(e,n),openNode:(e,n)=>this.host.openNode(e,n),addDisposer:e=>this.disposers.push(e)}}edgeWiring(){return{activateEdge:(e,n)=>this.host.activateEdge(e,n),openEdge:(e,n)=>this.host.openEdge(e,n),enterEdge:e=>this.edgeHover.enter(e),leaveEdge:e=>this.edgeHover.leave(e),syncBundles:()=>this.syncBundles(),pulse:e=>this.flow.pulse(e),stopFlow:()=>this.flow.stop()}}incidentRoutes(e){return this.flow.incidentRoutes(e)}focusEdge(e){return this.flow.focusEdge(e)}blurFocusedEdge(){return this.flow.blurFocusedEdge()}edgeAnnouncement(e){return this.flow.edgeAnnouncement(e)}applySelection(e){this.emphasis.applySelection(e)}hoverIntent(e){this.emphasis.hoverIntent(e)}setHover(e){this.emphasis.setHover(e)}get isFocusLocked(){return this.emphasis.isFocusLocked}toggleFocusMode(e){this.emphasis.toggleFocusMode(e)}syncBundles(){this.bundles.sync(this.edgeEls)}toggleCollapse(e){if(!this.frameData)return;let n=this.frameData.boxes.get(e),o=this.viewport.vp.zoom,i=n?{x:n.x*o+this.viewport.vp.x,y:n.y*o+this.viewport.vp.y}:null;this.collapsedSet.has(e)?this.collapsedSet.delete(e):this.collapsedSet.add(e),this.relayout();let s=this.frameData.boxes.get(e);s&&i&&this.viewport.set({x:i.x-s.x*this.viewport.vp.zoom,y:i.y-s.y*this.viewport.vp.zoom});let r=this.index?this.index.nodeById.get(e):null,a=this.index?this.index.descendantCount(e):0;this.host.afterCollapse(),this.host.announce("Group "+(r?r.label:e)+(this.collapsedSet.has(e)?" collapsed, "+a+(a===1?" step":" steps")+" hidden.":" 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zn({onTab:n=>t.setRailTab(n),onClearFilters:()=>t.clearFilters(),onSelectIssue:(n,o)=>{t.focusIssue(n,{fromList:"issues"}),t.doubleClick.arm(o,()=>t.openIssue(n,!1))},onOpenIssue:(n,o)=>t.openIssue(n,o),onSelectNode:(n,o)=>{t.select({kind:"node",id:n},{center:!0,reveal:!0,fromList:"outline"}),t.doubleClick.arm(o,()=>t.select({kind:"node",id:n},{center:!0,reveal:!0,open:!0,fromList:"outline"}))},onOpenNode:(n,o)=>t.select({kind:"node",id:n},{center:!0,reveal:!0,open:!0,focusEditor:o,fromList:"outline"}),onSelectEdge:n=>t.select({kind:"edge",id:n},{reveal:!0,fromList:"outline"}),onShowNode:n=>t.focusNode(n,{center:!0,pulse:!0}),onShowEdge:n=>t.select({kind:"edge",id:n},{reveal:!0}),onShowIssue:n=>t.focusIssue(n),onChallenge:()=>ad(t,"challenge"),onRefine:()=>ad(t,null),onOpen:(n,o)=>{t.walk.openQuote(n,!!o)||t.openLocation(n,o)},onResize:n=>t.setRailWidth(n),onSelectLane:n=>t.selectLane(n),onToggleCollapse:n=>{t.index&&t.index.isGroup(n)&&t.view.toggleCollapse(n)},onShowLimitations:()=>t.showAbout({at:"limitations",focus:!0}),onSheetToggle:()=>t.toggleRail(),onSheetCollapse:()=>{t.walk.stop()?Xi(t):t.collapseSheet(!0)},onSheetResize:n=>t.setSheetFraction(n),sheetFraction:()=>t.sheetFraction,sheetFractionMax:()=>t.sheetFractionMax(),bodyHeight:()=>e.body.getBoundingClientRect().height}),e.body.appendChild(t.rail.root),k(t.rail.root,"pointerdown",()=>{t.railChosen=!0}),k(t.rail.root,"keydown",()=>{t.railChosen=!0}),t.legend=new 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this.timer!==null}flushOpen(){this.timer!==null&&(this.cancelTimer(),this.sendOpen(!1))}sendOpen(e){if(!this.active)return;let n=this.currentLocs(),o=n[Math.min(this.quote,n.length-1)];if(!o){this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("none"),this.render();return}if(!this.app.caps.canOpenSource){this.status=this.statusFor("unavailable"),this.render();return}let i=++this.seq;this.latestSeq=i,this.remember(),this.app.bridge.saveState(this.app.getState());let s=Yi(o);s.walk=!0,s.seq=i,e&&(s.focus=!0),this.app.postRequest(s,l=>this.onResult(l,i));let r=this.localBlock(o);this.status=r?this.statusFor("blocked",r):this.statusFor("opening"),this.render()}show(e){let n=this.current();if(n){this.selecting=!0;try{this.app.showWalkClaim(n)}finally{this.selecting=!1}e?this.scheduleOpen():this.status=this.statusFor(this.currentLocs().length?this.app.caps.canOpenSource?"idle":"unavailable":"none"),this.remember(),this.render(),this.app.announce(this.announcement()),this.app.saveSoon()}}announcement(){let e=this.index(),n=this.current();return e&&n?aa(this.position,this.list.length,this.filter,e,n):""}render(e=!1){this.app.renderWalkBar(),Ei(this.app.rail.root,this.paneMark(),e)}paneMark(){if(!this.active)return null;let e=this.current();return!e||!le(e,this.app.selection)?null:{quote:this.status.quote,status:this.status}}remember(){let e=this.app.workflowRevision,n=this.current();if(!e||!n)return;let o={filter:this.filter,claim:{kind:n.kind,id:n.id}};this.quote>0&&(o.quote=this.quote),this.active&&(o.active=!0),this.remembered={revision:e,state:o}}viewState(){let e=this.app.workflowRevision;if(!this.remembered||!e||this.remembered.revision!==e)return;let n={...this.remembered.state,claim:{...this.remembered.state.claim}};return this.active?n.active=!0:delete n.active,n}restore(e,n){let o=Pg(n);this.restored=o?{revision:e,state:o}:null}destroy(){this.cancelTimer()}};var Fg=32,Zi=900,Bg=620,Dg=.47,vd=.25,bd=.75,io=class{constructor(e,n){this.graph=null;this.index=null;this.edgeAnchor=null;this.flowOn=!0;this.exceptionsOn=!1;this.filters=new Wt;this.viewportState={x:0,y:0,zoom:1};this.selection=null;this.collapsedState=[];this.railTab="about";this.legendOpen=!1;this.freshness=new Gt;this.openHintShown=!1;this.railOpen=!0;this.railChosen=!1;this.dockedHidden=!1;this.railWidth=360;this.railMode="docked";this.sheetFraction=Dg;this.paneColumns=1;this.workflowDocument=null;this.workflowRevision=null;this.restoredView=null;this.restoredComposer=null;this.restoredTab=null;this.restoredSelection=null;this.restoredSheet=null;this.pending=new Map;this.requestSerial=0;this.disposers=[];this.destroyed=!1;this.releasePage=()=>{};this.saveSoon=$i(()=>this.bridge.saveState(this.getState()),250);this.root=e,this.bridge=n,this.caps=n.capabilities,this.themes=new zt(e,n.theme||"light"),this.doubleClick=new on(e),this.disposers.push(()=>this.doubleClick.dispose()),this.walk=new oo(this),dd(this);let o=md(n);o&&no(this,o,!1),o&&typeof o.workflowRevision=="string"&&o.viewport&&(this.restoredView={revision:o.workflowRevision,viewport:{...o.viewport}});let i=o&&typeof o.workflowRevision=="string"?Ns(o.composer):null;o&&i&&(this.restoredComposer={revision:o.workflowRevision,composer:i});let s=o&&typeof o.workflowRevision=="string"?to(o.railTab):null;o&&s&&(this.restoredTab={revision:o.workflowRevision,tab:s});let r=o&&typeof o.workflowRevision=="string"?eo(o.selection):null;o&&r&&(this.restoredSelection={revision:o.workflowRevision,selection:r}),o&&typeof o.workflowRevision=="string"&&o.sheetOpen===!0&&(this.restoredSheet=o.workflowRevision),o&&typeof o.workflowRevision=="string"&&this.walk.restore(o.workflowRevision,o.walk),this.disposers.push(n.onMessage(l=>this.onMessage(l))),typeof window<"u"&&this.disposers.push(k(window,"resize",()=>this.onResize())),this.disposers.push(k(e,"keydown",l=>{l.defaultPrevented||!(l.ctrlKey||l.metaKey)||l.altKey||l.key!=="f"&&l.key!=="F"||this.modalOpen(l.target)||(l.preventDefault(),this.focusSearch())})),this.disposers.push(k(e,"keydown",l=>{l.key!=="Escape"||l.defaultPrevented||!this.walk.active||this.modalOpen(l.target)||this.walk.stop()&&l.preventDefault()})),this.chrome.setWidth(this.rootWidth()),this.view.setPanelWidth(this.rootWidth())}rootWidth(){let e=this.root.getBoundingClientRect().width;return e>0?e:0}onResize(){let e=this.chrome.headerLayout;this.chrome.setWidth(this.rootWidth())!==e&&(K(this),this.renderWalkBar()),this.view.setPanelWidth(this.rootWidth()),this.autoRail(),this.paneColumns!==this.selectionColumns()&&U(this)}selectionColumns(){return this.railMode==="sheet"&&this.rootWidth()>=Bg?2:1}railShown(){return this.railOpen}refreshChrome(){K(this)}focusSearch(){this.chrome.setSearchOpen(!0),this.search.focus()}showAbout(e={}){this.railTab="about",this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon();let n=e.at==="limitations"?this.rail.revealLimitations():e.focus?this.rail.activePanel():null;if(e.focus&&n)try{n.focus()}catch{}this.announce(e.at==="limitations"?"About: the coverage limitations.":"About this revision shown.")}modalOpen(e){if(this.sheet&&this.sheet.open||Mo(this))return!0;let n=e;return!!n&&typeof n.closest=="function"&&!!n.closest(".mlv-sheet, .mlv-workflow__composer")}closeHeaderPanels(){return Lo(this,!0)}headerPanelOpen(){return Mo(this)}setWorkflow(e,n){let o=this.workflowRevision!==e.revision.id,i=n;if(!n||!n.viewport){let r=null;this.graph&&this.workflowRevision===e.revision.id?r={...this.viewportState}:!this.graph&&this.restoredView&&this.restoredView.revision===e.revision.id&&(r={...this.restoredView.viewport}),r&&(i={...n||{},viewport:r})}this.restoredView=null;let s=this.restoredComposer&&this.restoredComposer.revision===e.revision.id?this.restoredComposer.composer:null;if(this.restoredComposer=null,this.workflowRevision!==e.revision.id){let r=!this.graph&&this.restoredTab&&this.restoredTab.revision===e.revision.id?this.restoredTab.tab:null;this.railTab=r||"about"}if(this.restoredTab=null,!this.graph){let r=l=>l===e.revision.id;this.restoredSelection&&r(this.restoredSelection.revision)&&(this.selection=this.restoredSelection.selection),r(this.restoredSheet)&&(this.railChosen=!0,this.railOpen=!0)}this.restoredSelection=null,this.restoredSheet=null,this.workflowDocument=e,this.workflowRevision=e.revision.id,this.autoRail(),ld(this,nn(e),i,!0),Bs(this,e,s),this.legendOtherKinds(),this.view.afterChromeChange(),this.walk.onDocument(o),this.syncNoticeReview()}postRequest(e,n){this.requestSerial+=1;let o="";for(let s=0;s<4;s++)o+=Math.floor(Math.random()*36).toString(36);let i="r"+this.requestSerial.toString(36)+"-"+o;for(this.pending.set(i,n);this.pending.size>Fg;){let s=this.pending.keys().next().value;if(s===void 0)break;this.pending.delete(s)}return this.bridge.post({...e,requestId:i}),i}onActionResult(e){if(!e||typeof e.requestId!="string")return;let n=this.pending.get(e.requestId);n&&(this.pending.delete(e.requestId),n(e))}openLocation(e,n=!1){cd(this,e,n)}setStale(e){this.freshness.set(e)&&(this.view.setStale(this.freshness.list()),this.index&&this.view.refresh(this.selection),K(this),U(this),this.walk.onStale(),this.syncNoticeReview())}showHostNotice(e,n){let o=!!n&&n.length===1&&n[0]==="checking";if(this.freshness.checking!==o&&(this.freshness.checking=o,K(this)),o)return;let i=this.notice.root.hidden;this.notice.update(e,n),this.syncNoticeReview();let s=this.root.querySelector(".mlv-body");s&&this.notice.root.nextSibling!==s&&this.root.insertBefore(this.notice.root,s),this.graph&&i!==this.notice.root.hidden&&this.view.afterChromeChange()}syncNoticeReview(){let e=this.graph&&this.walk.changedOffered()?this.walk.counts().changed:0;this.notice.setReview(e,this.walk.active)}renderWalkBar(){if(!this.walkBar)return;let e=this.walk;if(!e.active){this.walkBar.update(null);return}this.walkBar.update({position:e.position,total:e.list.length,filter:e.filter,counts:e.counts(),offered:e.offered(),status:e.status,narrow:this.chrome.headerLayout==="narrow"})}onWalkShown(e){this.renderWalkBar(),K(this),this.syncNoticeReview(),e||U(this),this.graph&&this.view.afterSheetToggle()}openRailForWalk(){this.railMode!=="docked"||this.railOpen||(this.railChosen=!0,this.setRailOpen(!0))}walkOwns(e){return le(this.walk.current(),e)}showWalkClaim(e){let n=this.index;if(!n)return;let o=r=>{let l=n.edgeById.get(r);l&&(this.view.expandAncestors(l.source),this.view.expandAncestors(l.target))};if(e.kind==="issue"){let r=n.issueById.get(e.id);if(!r)return;for(let l of r.nodeIds)this.view.expandAncestors(l);for(let l of r.edgeIds)o(l)}else e.kind==="node"?this.view.expandAncestors(e.id):o(e.id);this.select(e,{tab:"inspector",showClaim:!0}),e.kind==="issue"?this.view.frameIssue(e.id):this.view.revealTarget({kind:e.kind,id:e.id});let i=this.view.canvasEl,s=i.ownerDocument?i.ownerDocument.activeElement:null;if(s&&s!==i&&i.contains(s))try{i.focus()}catch{}}setMinimapCollapsed(e){this.view.setMinimapCollapsed(e),K(this),this.saveSoon(),this.announce("Overview minimap "+(e?"hidden":"shown")+".")}setLegend(e){this.legendOpen=e,this.legend.setOpen(e),K(this),this.saveSoon()}setRailTab(e){this.railTab=e,this.railMode==="sheet"&&!this.railOpen&&(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon()}showRailTab(e){this.railTab=e,this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.saveSoon(),this.railMode==="sheet"&&this.rail.focusTab(e)}focusRailTabs(){this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),U(this),this.rail.focusTab(this.railTab)}toggleRail(){this.railChosen=!0,this.railMode==="docked"&&(this.dockedHidden=this.railOpen),this.setRailOpen(!this.railOpen)}collapseSheet(e=!1){if(this.railMode!=="sheet"||!this.railOpen)return!1;if(this.railChosen=!0,this.setRailOpen(!1),this.announce("Bottom panel collapsed."),e)try{this.view.canvasEl.focus()}catch{}return!0}sheetFractionMax(){let e=this.root.querySelector(".mlv-body"),n=e?e.getBoundingClientRect().height:0;if(!(n>0))return bd;let o=Math.min(240,.45*n);return Math.max(vd,Math.min(bd,(n-o)/n))}setSheetFraction(e){let n=Math.max(vd,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Zi?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),U(this),K(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&K(this),e&&this.rail&&U(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Zi>=280?n-Zi:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),K(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),K(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),U(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),this.walk.followSelection(e),n&&n.open)if(this.walk.active&&this.walkOwns(e))this.walk.reopen(!!n.focusEditor);else{let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),U(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(_l()){let n=pa(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),K(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),U(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){fd(this,e)}onMessage(e){gd(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;if(this.walk.active&&this.walkOwns(this.selection)){this.walk.reopen(n);return}let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return pd(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.walk.destroy(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.walkBar.destroy(),this.view.destroy(),this.releasePage(),N(this.root),this.root.classList.remove("mlv-root")}}};var Ft=null;function jg(){if(Ft)return Ft;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Ft=t.acquireVsCodeApi()}catch{Ft=null}return Ft}function Gg(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function Wg(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function yd(){let t=jg(),e={canOpenSource:!0};return{host:"vscode",theme:Gg(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return Wg(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var zg="0.3.0";function Vg(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is 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+`))}),e}function Mg(t,e,n,o){let i=n.index,s=i.inEdges.get(e.id)||[],r=i.outEdges.get(e.id)||[];if(!s.length&&!r.length)return;let a=g(t,f("section","mlv-insp__section mlv-insp__flow"));a.setAttribute("data-section","connections"),a.appendChild(Ve("Connections",ze(s.length+r.length,"connection","connections")));let l=g(a,f("ul","mlv-insp__sentences")),d=(c,u)=>{let h=g(l,f("li"));h.setAttribute("data-direction",u);let m=u==="in"?c.source:c.target;m===e.id?g(h,f("span","","Loops back to this step")):(g(h,f("span","",u==="in"?"Comes from ":"Feeds ")),h.appendChild(it(m,i.nodeById.get(m),o))),g(h,f("span","",": "));let p=U("mlv-link mlv-insp__flow-edge",c.label||"an unlabelled connection","Select the connection "+is(i,c));p.setAttribute("data-edge-id",c.id),_(p,"click",()=>o.onShowEdge(c.id)),h.appendChild(p);let v=c.basis==="inferred"?" (inferred, not observed)":c.basis==="unresolved"?" 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cc(t,e){Vs(e,{init:(n,o)=>{t.caps=o||t.caps,t.setTheme(n),X(t),Q(t)},workflow:n=>{n!==t.workflowDocument&&t.setWorkflow(n)},workflowStatus:n=>yr(t,n),hostNotice:(n,o)=>t.showHostNotice(n,o),stale:n=>t.setStale(n),actionResult:n=>t.onActionResult(n),theme:n=>t.setTheme(n),revealNode:(n,o)=>t.focusNode(n,{center:o,pulse:!0}),revealIssue:n=>t.focusIssue(n),restoreState:n=>xo(t,n,!0),onUnknown:n=>t.bridge.post({v:1,type:"log",level:"debug",message:"ignored unknown message type: "+n})})}var rb=150,ab=100;function lb(t){if(!t||typeof t!="object")return null;let e=t,n=typeof e.filter=="string"&&xt.indexOf(e.filter)>=0?e.filter:null,o=e.claim;if(!n||!o||typeof o!="object"||o.kind!=="node"&&o.kind!=="edge"&&o.kind!=="issue"||typeof o.id!="string"||!o.id)return null;let i={filter:n,claim:{kind:o.kind,id:o.id}},s=e.quote;return typeof s=="number"&&Number.isInteger(s)&&s>0&&s!!this.app.freshness.reasonOf(e);this.app=e}index(){return this.app.index}claims(){let e=this.index();return 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this.active?(this.active=!1,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"end"}),this.remember(),this.app.onWalkShown(!1),e&&this.app.announce("Review ended. r resumes it here."),this.app.saveSoon(),!0):!1}toggle(){this.active?this.stop():this.start()}step(e){if(!this.active||!this.list.length)return!1;let n=Math.max(0,Math.min(this.list.length-1,this.position+e));return n===this.position?(this.app.announce(e>0?"Claim "+this.list.length+" of "+this.list.length+" is the last one.":"Claim 1 of "+this.list.length+" is the first one."),!0):(this.position=n,this.quote=0,this.show(!0),!0)}stepQuote(e){if(!this.active)return!1;let n=this.currentLocs();if(n.length<2)return this.app.announce(n.length?"This claim has one quote.":"This claim cites no lines."),!0;let o=Math.max(0,Math.min(n.length-1,this.quote+e));return o===this.quote?(this.app.announce(e>0?"Quote "+n.length+" of "+n.length+" is the last one.":"Quote 1 of "+n.length+" is the first one."),!0):(this.quote=o,this.app.announce("Quote "+(o+1)+" of "+n.length+": "+Xi(n[o])+"."),this.scheduleOpen(),this.remember(),this.render(!0),this.app.saveSoon(),!0)}jump(e,n){let o=this.index();if(!o)return!1;let i=e;if(!this.active)return this.start(i);let s=this.claims(),r=d=>e==="findings"?d.kind==="issue":We(so(o,d)),a=s.findIndex(d=>pe(d,this.current())),l=null;for(let d=1;d<=s.length;d++){let c=((a<0?n?0:-1:a)+(n?-d:d)+s.length*2)%s.length;if(r(s[c])){l=s[c];break}}return l?(this.list.some(d=>pe(d,l))||(this.filter=i,this.list=this.listFor(i)),this.position=Math.max(0,this.list.findIndex(d=>pe(d,l))),this.quote=0,this.show(!0),!0):(this.app.announce(e==="findings"?"This revision has no findings.":"No claim is marked inferred or unresolved in this revision."),!0)}setFilter(e){if(!this.active||this.offered().indexOf(e)<0)return;let n=this.current();this.filter=e,this.list=this.listFor(e),this.position=Math.max(0,kt(this.list,n,this.claims()));let o=pe(n,this.current());o||(this.quote=0),this.show(!o),this.app.announce(Et[e]+": "+this.list.length+(this.list.length===1?" claim. ":" claims. ")+this.announcement())}reopen(e){return!this.active||!this.current()?!1:(this.cancelTimer(),this.sendOpen(e),!0)}openQuote(e,n){if(!this.active||!e.evidenceId)return!1;let o=this.currentLocs().findIndex(i=>i.evidenceId===e.evidenceId);return o<0?!1:(this.quote=o,this.cancelTimer(),this.sendOpen(n),this.remember(),!0)}followSelection(e){if(!this.active||this.selecting||!e)return;let n=this.list.findIndex(o=>pe(o,e));n<0||n===this.position||(this.position=n,this.quote=0,this.cancelTimer(),this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("idle"),this.remember(),this.render())}onDocument(e){let n=this.app.workflowRevision;e&&(this.active&&this.stop(!1),this.remembered=null,this.list=[],this.position=-1);let o=this.restored;if(this.restored=null,o&&o.revision===n&&!this.remembered){this.remembered={revision:n,state:o.state},o.state.active&&this.resume();return}if(!this.active)return;let i=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,kt(this.list,i,this.claims())),this.render()}resume(){let e=this.remembered?this.remembered.state:null;if(!e)return;let n=this.offered();this.filter=n.indexOf(e.filter)>=0?e.filter:"all",this.list=this.listFor(this.filter),this.list.length&&(this.position=Math.max(0,kt(this.list,e.claim,this.claims())),this.quote=pe(e.claim,this.current())?Math.min(e.quote||0,Math.max(0,this.currentLocs().length-1)):0,this.active=!0,this.app.onWalkShown(!0),this.show(!1))}onStale(){if(!this.active)return;this.offered().indexOf(this.filter)<0&&(this.filter="all");let e=this.current();this.list=this.listFor(this.filter),this.position=Math.max(0,kt(this.list,e,this.claims())),this.render()}onResult(e,n){if(!(!this.active||n!==this.latestSeq||e.outcome==="cancelled")){if(e.outcome==="done")this.status=this.statusFor("done");else{let o=e.message||(e.outcome==="blocked"?"Not opened.":"VS Code could not show the file.");this.status=this.statusFor(e.outcome,o),this.app.announce((e.outcome==="blocked"?"Not opened: ":"Failed: ")+o)}this.render()}}cancelTimer(){this.timer!==null&&clearTimeout(this.timer),this.timer=null}statusFor(e,n){let o=this.currentLocs(),i=Math.min(this.quote,Math.max(0,o.length-1)),s={state:e,quote:i,quotes:o.length};return o[i]&&e!=="none"&&e!=="unavailable"&&(s.loc=o[i]),n&&(s.message=n),s}localBlock(e){let n=e.evidenceId?this.app.freshness.reasonOf(e.file):void 0;return n?e.file+": "+me[n]+"; not opened.":null}scheduleOpen(){this.cancelTimer();let e=this.currentLocs(),n=e[Math.min(this.quote,e.length-1)];if(!e.length||!n)this.status=this.statusFor("none");else if(!this.app.caps.canOpenSource)this.status=this.statusFor("unavailable");else{let o=this.localBlock(n);this.status=o?this.statusFor("blocked",o):this.statusFor("opening")}this.status.state!=="unavailable"&&(this.timer=setTimeout(()=>{this.timer=null,this.sendOpen(!1)},rb))}get pendingOpen(){return this.timer!==null}flushOpen(){this.timer!==null&&(this.cancelTimer(),this.sendOpen(!1))}sendOpen(e){if(!this.active)return;let n=this.currentLocs(),o=n[Math.min(this.quote,n.length-1)];if(!o){this.app.bridge.post({v:1,type:"walk",state:"clear"}),this.status=this.statusFor("none"),this.render();return}if(!this.app.caps.canOpenSource){this.status=this.statusFor("unavailable"),this.render();return}let i=++this.seq;this.latestSeq=i,this.remember(),this.app.bridge.saveState(this.app.getState());let s=Ss(o);s.walk=!0,s.seq=i,e&&(s.focus=!0),this.app.postRequest(s,a=>this.onResult(a,i));let r=this.localBlock(o);this.status=r?this.statusFor("blocked",r):this.statusFor("opening"),this.render()}show(e){let n=this.current();if(n){this.selecting=!0;try{this.app.showWalkClaim(n)}finally{this.selecting=!1}e?this.scheduleOpen():this.status=this.statusFor(this.currentLocs().length?this.app.caps.canOpenSource?"idle":"unavailable":"none"),this.remember(),this.render(),this.app.announce(this.announcement()),this.app.saveSoon()}}announcement(){let e=this.index(),n=this.current();return e&&n?nd(this.position,this.list.length,this.filter,e,n):""}render(e=!1){this.app.renderWalkBar(),$i(this.app.rail.root,this.paneMark(),e)}paneMark(){if(!this.active)return null;let e=this.current();return!e||!pe(e,this.app.selection)?null:{quote:this.status.quote,status:this.status}}remember(){let e=this.app.workflowRevision,n=this.current();if(!e||!n)return;let o={filter:this.filter,claim:{kind:n.kind,id:n.id}};this.quote>0&&(o.quote=this.quote),this.active&&(o.active=!0),this.remembered={revision:e,state:o}}viewState(){let e=this.app.workflowRevision;if(!this.remembered||!e||this.remembered.revision!==e)return;let n={...this.remembered.state,claim:{...this.remembered.state.claim}};return this.active?n.active=!0:delete n.active,n}restore(e,n){let o=lb(n);this.restored=o?{revision:e,state:o}:null}destroy(){this.cancelTimer()}};var db=32,Ms=900,cb=620,ub=.47,uc=.25,hc=.75,ko=class{constructor(e,n){this.graph=null;this.index=null;this.edgeAnchor=null;this.flowOn=!0;this.exceptionsOn=!1;this.filters=new tn;this.viewportState={x:0,y:0,zoom:1};this.selection=null;this.collapsedState=[];this.railTab="about";this.legendOpen=!1;this.freshness=new en;this.openHintShown=!1;this.railOpen=!0;this.railChosen=!1;this.dockedHidden=!1;this.railWidth=360;this.railMode="docked";this.sheetFraction=ub;this.paneColumns=1;this.workflowDocument=null;this.workflowRevision=null;this.restoredView=null;this.restoredComposer=null;this.restoredTab=null;this.restoredSelection=null;this.restoredSheet=null;this.pending=new Map;this.requestSerial=0;this.disposers=[];this.destroyed=!1;this.releasePage=()=>{};this.saveSoon=Hs(()=>this.bridge.saveState(this.getState()),250);this.root=e,this.bridge=n,this.caps=n.capabilities,this.themes=new nn(e,n.theme||"light"),this.doubleClick=new vn(e),this.disposers.push(()=>this.doubleClick.dispose()),this.walk=new Eo(this),oc(this);let o=dc(n);o&&xo(this,o,!1),o&&typeof o.workflowRevision=="string"&&o.viewport&&(this.restoredView={revision:o.workflowRevision,viewport:{...o.viewport}});let i=o&&typeof o.workflowRevision=="string"?br(o.composer):null;o&&i&&(this.restoredComposer={revision:o.workflowRevision,composer:i});let s=o&&typeof o.workflowRevision=="string"?yo(o.railTab):null;o&&s&&(this.restoredTab={revision:o.workflowRevision,tab:s});let r=o&&typeof o.workflowRevision=="string"?wo(o.selection):null;o&&r&&(this.restoredSelection={revision:o.workflowRevision,selection:r}),o&&typeof o.workflowRevision=="string"&&o.sheetOpen===!0&&(this.restoredSheet=o.workflowRevision),o&&typeof o.workflowRevision=="string"&&this.walk.restore(o.workflowRevision,o.walk),this.disposers.push(n.onMessage(a=>this.onMessage(a))),typeof window<"u"&&this.disposers.push(_(window,"resize",()=>this.onResize())),this.disposers.push(_(e,"keydown",a=>{a.defaultPrevented||!(a.ctrlKey||a.metaKey)||a.altKey||a.key!=="f"&&a.key!=="F"||this.modalOpen(a.target)||(a.preventDefault(),this.focusSearch())})),this.disposers.push(_(e,"keydown",a=>{a.key!=="Escape"||a.defaultPrevented||!this.walk.active||this.modalOpen(a.target)||this.walk.stop()&&a.preventDefault()})),this.chrome.setWidth(this.rootWidth()),this.view.setPanelWidth(this.rootWidth())}rootWidth(){let e=this.root.getBoundingClientRect().width;return e>0?e:0}onResize(){let e=this.chrome.headerLayout;this.chrome.setWidth(this.rootWidth())!==e&&(X(this),this.renderWalkBar()),this.view.setPanelWidth(this.rootWidth()),this.autoRail(),this.paneColumns!==this.selectionColumns()&&Q(this)}selectionColumns(){return this.railMode==="sheet"&&this.rootWidth()>=cb?2:1}railShown(){return this.railOpen}refreshChrome(){X(this)}focusSearch(){this.chrome.setSearchOpen(!0),this.search.focus()}showAbout(e={}){this.railTab="about",this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.saveSoon();let n=e.at==="limitations"?this.rail.revealLimitations():e.focus?this.rail.activePanel():null;if(e.focus&&n)try{n.focus()}catch{}this.announce(e.at==="limitations"?"About: the coverage limitations.":"About this revision shown.")}modalOpen(e){if(this.sheet&&this.sheet.open||Zo(this))return!0;let n=e;return!!n&&typeof n.closest=="function"&&!!n.closest(".mlv-sheet, .mlv-workflow__composer")}closeHeaderPanels(){return Qo(this,!0)}headerPanelOpen(){return Zo(this)}setWorkflow(e,n){let o=this.workflowRevision!==e.revision.id,i=n;if(!n||!n.viewport){let r=null;this.graph&&this.workflowRevision===e.revision.id?r={...this.viewportState}:!this.graph&&this.restoredView&&this.restoredView.revision===e.revision.id&&(r={...this.restoredView.viewport}),r&&(i={...n||{},viewport:r})}this.restoredView=null;let s=this.restoredComposer&&this.restoredComposer.revision===e.revision.id?this.restoredComposer.composer:null;if(this.restoredComposer=null,this.workflowRevision!==e.revision.id){let r=!this.graph&&this.restoredTab&&this.restoredTab.revision===e.revision.id?this.restoredTab.tab:null;this.railTab=r||"about"}if(this.restoredTab=null,!this.graph){let r=a=>a===e.revision.id;this.restoredSelection&&r(this.restoredSelection.revision)&&(this.selection=this.restoredSelection.selection),r(this.restoredSheet)&&(this.railChosen=!0,this.railOpen=!0)}this.restoredSelection=null,this.restoredSheet=null,this.workflowDocument=e,this.workflowRevision=e.revision.id,o&&this.view.closeOverview(!1),this.autoRail(),tc(this,gn(e),i,!0),xr(this,e,s),this.legendOtherKinds(),this.view.afterChromeChange(),this.walk.onDocument(o),this.syncNoticeReview()}postRequest(e,n){this.requestSerial+=1;let o="";for(let s=0;s<4;s++)o+=Math.floor(Math.random()*36).toString(36);let i="r"+this.requestSerial.toString(36)+"-"+o;for(this.pending.set(i,n);this.pending.size>db;){let s=this.pending.keys().next().value;if(s===void 0)break;this.pending.delete(s)}return this.bridge.post({...e,requestId:i}),i}onActionResult(e){if(!e||typeof e.requestId!="string")return;let n=this.pending.get(e.requestId);n&&(this.pending.delete(e.requestId),n(e))}openLocation(e,n=!1){ic(this,e,n)}setStale(e){this.freshness.set(e)&&(this.view.setStale(this.freshness.list()),this.index&&this.view.refresh(this.selection),X(this),Q(this),this.walk.onStale(),this.syncNoticeReview())}showHostNotice(e,n){let o=!!n&&n.length===1&&n[0]==="checking";if(this.freshness.checking!==o&&(this.freshness.checking=o,X(this)),o)return;let i=this.notice.root.hidden;this.notice.update(e,n),this.syncNoticeReview();let s=this.root.querySelector(".mlv-body");s&&this.notice.root.nextSibling!==s&&this.root.insertBefore(this.notice.root,s),this.graph&&i!==this.notice.root.hidden&&this.view.afterChromeChange()}syncNoticeReview(){let e=this.graph&&this.walk.changedOffered()?this.walk.counts().changed:0;this.notice.setReview(e,this.walk.active)}renderWalkBar(){if(!this.walkBar)return;let e=this.walk;if(!e.active){this.walkBar.update(null);return}this.walkBar.update({position:e.position,total:e.list.length,filter:e.filter,counts:e.counts(),offered:e.offered(),status:e.status,narrow:this.chrome.headerLayout==="narrow"})}onWalkShown(e){this.renderWalkBar(),X(this),this.syncNoticeReview(),e||Q(this),this.graph&&this.view.afterSheetToggle()}openRailForWalk(){this.railMode!=="docked"||this.railOpen||(this.railChosen=!0,this.setRailOpen(!0))}walkOwns(e){return pe(this.walk.current(),e)}showWalkClaim(e){let n=this.index;if(!n)return;let o=r=>{let a=n.edgeById.get(r);a&&(this.view.expandAncestors(a.source),this.view.expandAncestors(a.target))};if(e.kind==="issue"){let r=n.issueById.get(e.id);if(!r)return;for(let a of r.nodeIds)this.view.expandAncestors(a);for(let a of r.edgeIds)o(a)}else e.kind==="node"?this.view.expandAncestors(e.id):o(e.id);this.select(e,{tab:"inspector",showClaim:!0}),e.kind==="issue"?this.view.frameIssue(e.id):this.view.revealTarget({kind:e.kind,id:e.id});let i=this.view.canvasEl,s=i.ownerDocument?i.ownerDocument.activeElement:null;if(s&&s!==i&&i.contains(s))try{i.focus()}catch{}}setPhaseIndexShown(e){this.view.setPhaseIndex({hidden:!e}),X(this),this.saveSoon(),this.announce("Phase index "+(e?"shown":"hidden")+".")}toggleOverview(e=!1){if(this.view.overviewOpen){if(this.view.closeOverview(!0),e)try{this.view.canvasEl.focus()}catch{}}else this.view.openOverview();X(this)}setLegend(e){this.legendOpen=e,this.legend.setOpen(e),X(this),this.saveSoon()}setRailTab(e){this.railTab=e,this.railMode==="sheet"&&!this.railOpen&&(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.saveSoon()}showRailTab(e){this.railTab=e,this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.saveSoon(),this.railMode==="sheet"&&this.rail.focusTab(e)}focusRailTabs(){this.railOpen||(this.railChosen=!0,this.setRailOpen(!0)),Q(this),this.rail.focusTab(this.railTab)}toggleRail(){this.railChosen=!0,this.railMode==="docked"&&(this.dockedHidden=this.railOpen),this.setRailOpen(!this.railOpen)}collapseSheet(e=!1){if(this.railMode!=="sheet"||!this.railOpen)return!1;if(this.railChosen=!0,this.setRailOpen(!1),this.announce("Bottom panel collapsed."),e)try{this.view.canvasEl.focus()}catch{}return!0}sheetFractionMax(){let e=this.root.querySelector(".mlv-body"),n=e?e.getBoundingClientRect().height:0;if(!(n>0))return hc;let o=Math.min(240,.45*n);return Math.max(uc,Math.min(hc,(n-o)/n))}setSheetFraction(e){let n=Math.max(uc,Math.min(this.sheetFractionMax(),e));Math.abs(n-this.sheetFraction)<.001||(this.sheetFraction=n,this.rail.setSheetFraction(n),this.railMode==="sheet"&&this.railOpen&&this.graph&&this.view.afterSheetToggle())}autoRail(){let e=this.root.getBoundingClientRect().width;if(!(e>0))return;let n=e-this.railWidth>=Ms?"docked":"sheet",o=this.railOpen;if(n!==this.railMode?o=n==="sheet"?this.railOpen&&this.railChosen:!this.dockedHidden:n==="docked"&&!this.railChosen&&(o=!0),n===this.railMode&&o===this.railOpen)return;let i=n!==this.railMode;this.railMode=n,this.rail.setMode(n,this.sheetFraction),this.setRailOpen(o,!0),i&&(this.saveSoon(),n==="docked"&&this.setRailWidth(this.railWidth),Q(this),X(this)),this.graph&&this.view.handleResize()}legendOtherKinds(){let e=new Map,n=0;for(let i of this.graph?.edges||[])if(i.kind==="unknown")n++;else{let s=i.authoredKind||i.kind;e.set(s,(e.get(s)||0)+1)}let o=Array.from(e,([i,s])=>({kind:i,count:s})).sort((i,s)=>s.count-i.count||(i.kinds.kind?1:0));this.legend.setKinds(o,n)}showRailForFinding(){return this.railChosen=!0,this.railOpen?!1:(this.setRailOpen(!0),!0)}setRailOpen(e,n=!1){let o=this.railOpen!==e;this.railOpen=e,e&&this.railMode==="docked"&&(this.dockedHidden=!1),this.rail.setOpen(e),o&&(this.saveSoon(),this.chrome&&X(this),e&&this.rail&&Q(this),!n&&this.railMode==="sheet"&&this.graph&&this.view.afterSheetToggle())}toggleShortcuts(e){if(typeof e=="boolean"?e:!this.sheet.open){this.sheet.show();return}this.sheet.hide(this.view.canvasEl)}setRailWidth(e){let n=this.rootWidth(),o=this.railMode==="docked"&&n-Ms>=280?n-Ms:560;this.railWidth=Math.max(280,Math.min(560,o,Math.round(e))),this.railMode==="docked"&&(this.rail.root.style.width=this.railWidth+"px")}setExceptions(e){this.exceptionsOn=e,e?this.view.canvasEl.setAttribute("data-exceptions","on"):this.view.canvasEl.removeAttribute("data-exceptions"),X(this),this.announce(e?"Observed claims faded; inferred and unresolved claims stand out.":"Observed claims shown normally.")}setFlow(e){this.flowOn=e,this.view.flow.setEnabled(e),this.view.flow.syncCanvas(),X(this),this.saveSoon()}select(e,n){e.kind!=="edge"&&(this.edgeAnchor=null),this.view.clearArrowLane(),this.selection=e,this.railTab=n&&n.tab?n.tab:this.selectionTab(n&&n.fromList);let o=!1;if(e.kind==="issue"&&(o=this.showRailForFinding()),n&&n.showClaim&&(o=this.showRailForClaim()||o),this.view.applySelection(e),Q(this),n&&n.reveal&&e.kind==="edge"?this.view.revealEdge(e.id):n&&n.center&&n.reveal?this.view.revealNode(e.id,!!n.pulse):n&&n.center?this.view.centerOnNode(e.id,!!n.pulse):o&&e.kind!=="issue"&&this.view.keepInView({kind:e.kind,id:e.id}),this.announceSelection(),this.walk.followSelection(e),n&&n.open)if(this.walk.active&&this.walkOwns(e))this.walk.reopen(!!n.focusEditor);else{let i=this.locOf(e);i&&this.openLocation(i,!!n.focusEditor)}this.saveSoon()}showRailForClaim(){return this.railOpen?(this.railChosen=!0,!1):this.railMode==="docked"&&this.railChosen?!1:(this.railChosen=!0,this.setRailOpen(!0),!0)}selectionTab(e){return e&&this.railTab===e&&this.railShown()?e:"inspector"}clearSelection(){this.selection&&(this.selection=null,this.view.applySelection(null),Q(this),this.saveSoon())}locOf(e){if(!this.index)return null;if(e.kind==="node"){let o=this.index.nodeById.get(e.id);return o&&o.loc.file?o.loc:null}if(e.kind==="edge"){let o=this.index.edgeById.get(e.id);return o&&o.loc.file?o.loc:null}let n=this.index.issueById.get(e.id);return n&&n.loc.file?n.loc:null}selectedNodeId(){let e=this.selection;if(!e||!this.index)return null;if(e.kind==="node")return e.id;if(e.kind!=="issue")return null;let n=this.index.issueById.get(e.id);return n&&n.nodeIds.length?n.nodeIds[0]:null}announceSelection(){let e=this.selection;if(!(!e||!this.index)){if(Ua()){let n=ld(this.index,e);n&&this.announce(n);return}if(e.kind==="node"){let n=this.view.labelOf(e.id);n&&this.announce("Selected "+n)}else if(e.kind==="issue"){let n=this.index.issueById.get(e.id);n&&this.announce("Finding "+(n.short?n.short+" ("+n.code+")":n.code)+", "+n.severity+" severity: "+n.title)}}}applyFilters(e){e(),X(this),this.index&&(this.view.render(),this.view.applySelection(this.selection)),Q(this),this.saveSoon()}clearFilters(){this.search.clear(),this.applyFilters(()=>this.filters.reset())}selectLane(e){if(!this.index)return;let n=this.index.roots(e);if(!n.length){this.announce("That phase has no steps.");return}this.select({kind:"node",id:n[0]},{center:!0,pulse:!0,fromList:"outline"})}zoomToSelection(){let e=this.selectedNodeId();e&&this.view.zoomToNode(e)}announce(e){this.liveEl.textContent=e}activateHit(e){e.kind==="node"?this.focusNode(e.id,{center:!0,pulse:!0,showClaim:!0}):this.focusIssue(e.id)}onKeyDown(e){ac(this,e)}onMessage(e){cc(this,e)}focusNode(e,n){if(this.index){if(!this.index.nodeById.has(e)){this.view.toast("Node not found in this graph");return}this.view.expandAncestors(e),this.select({kind:"node",id:e},{center:n?n.center!==!1:!0,pulse:n?!!n.pulse:!1,showClaim:!!(n&&n.showClaim)})}}focusIssue(e,n){if(!this.index)return;let o=this.index.issueById.get(e);if(o){for(let i of o.nodeIds)this.view.expandAncestors(i);this.select({kind:"issue",id:e},{fromList:n&&n.fromList}),this.view.frameIssue(e)}}openIssue(e,n=!1){if(this.focusIssue(e,{fromList:"issues"}),!this.selection||this.selection.kind!=="issue"||this.selection.id!==e)return;if(this.walk.active&&this.walkOwns(this.selection)){this.walk.reopen(n);return}let o=this.locOf({kind:"issue",id:e});o&&this.openLocation(o,n)}setFilters(e){this.applyFilters(()=>this.filters.patch(e))}setTheme(e){this.themes.apply(e)}getState(){return lc(this)}destroy(){if(!this.destroyed){this.destroyed=!0,this.saveSoon.cancel(),this.walk.destroy(),this.pending.clear();for(let e of this.disposers)try{e()}catch{}this.disposers=[],this.themes.destroy(),this.chrome.destroy(),this.walkBar.destroy(),this.view.destroy(),this.releasePage(),B(this.root),this.root.classList.remove("mlv-root")}}};var Zt=null;function hb(){if(Zt)return Zt;let t=typeof window<"u"?window:{};if(typeof t.acquireVsCodeApi=="function")try{Zt=t.acquireVsCodeApi()}catch{Zt=null}return Zt}function fb(){if(typeof document>"u"||!document.body)return"light";let t=document.body.className||"";return t.indexOf("vscode-high-contrast")>=0?"hc":t.indexOf("vscode-dark")>=0?"dark":"light"}function pb(t){if(typeof window>"u")return()=>{};let e=n=>{let o=n&&n.data;o&&typeof o=="object"&&t(o)};return window.addEventListener("message",e),()=>window.removeEventListener("message",e)}function fc(){let t=hb(),e={canOpenSource:!0};return{host:"vscode",theme:fb(),capabilities:e,post(n){t&&typeof t.postMessage=="function"&&t.postMessage(n)},onMessage(n){return pb(n)},saveState(n){t&&typeof t.setState=="function"&&t.setState(n)},loadState(){if(t&&typeof t.getState=="function"){let n=t.getState();return n&&typeof n=="object"?n:null}return null}}}var mb="0.3.0";function gb(t,e,n){if(!t)throw new Error("MLView.mountWorkflow: a root element is required");if(!n)throw new Error("MLView.mountWorkflow: a HostBridge is required");let o=new ko(t,n);return o.setWorkflow(e),o}var vb={vscode(){return fc()}};return Ec(bb);})();
diff --git a/webview/src/app.ts b/webview/src/app.ts
index 6dd37db9..6f62d6be 100644
--- a/webview/src/app.ts
+++ b/webview/src/app.ts
@@ -416,6 +416,8 @@ export class App implements MLViewApp {
     this.restoredSheet = null;
     this.workflowDocument = document;
     this.workflowRevision = document.revision.id;
+    // Viewer M3: another revision closes the phase overview drawn for the one before.
+    if (revisionChanged) this.view.closeOverview(false);
     // Before the first fit, so the fit sees the canvas the rail leaves (issue 6).
     this.autoRail();
     setGraph(this, normalizeWorkflow(document), next, true);
@@ -588,12 +590,31 @@ export class App implements MLViewApp {
     }
   }
 
-  /** VIEW-12: the toolbar's copy of the minimap chevron. */
-  setMinimapCollapsed(next: boolean): void {
-    this.view.setMinimapCollapsed(next);
+  /** Viewer M3: the ... menu shows or hides the phase index (it replaced the minimap). */
+  setPhaseIndexShown(shown: boolean): void {
+    this.view.setPhaseIndex({ hidden: !shown });
     renderChrome(this);
     this.saveSoon();
-    this.announce('Overview minimap ' + (next ? 'hidden' : 'shown') + '.');
+    this.announce('Phase index ' + (shown ? 'shown' : 'hidden') + '.');
+  }
+
+  /**
+   * Viewer M3: the phase overview (Shift+0, the ... menu). Open it over the canvas, or close it and
+   * go back to where the reader was. `fromMenu`: the menu gave the focus back to its button, so the
+   * focus is moved into the overview (opening) or onto the canvas (closing).
+   */
+  toggleOverview(fromMenu = false): void {
+    if (this.view.overviewOpen) {
+      this.view.closeOverview(true);
+      if (fromMenu) {
+        try {
+          this.view.canvasEl.focus();
+        } catch (_e) {
+          /* the canvas may already be torn down */
+        }
+      }
+    } else this.view.openOverview();
+    renderChrome(this);
   }
 
   setLegend(next: boolean): void {
@@ -829,6 +850,8 @@ export class App implements MLViewApp {
 
   select(sel: Sel, opts?: SelectOptions): void {
     if (sel.kind !== 'edge') this.edgeAnchor = null;
+    // Viewer M3: a selection replaces the phase a move to a phase left the arrow keys on.
+    this.view.clearArrowLane();
     this.selection = sel;
     // Viewer M2: a selection shows its claim in the Selection tab, unless it was made from the
     // Findings list or the Outline on screen (a list the reader is walking keeps its place).
diff --git a/webview/src/app/build.ts b/webview/src/app/build.ts
index b3988bab..e01b5825 100644
--- a/webview/src/app/build.ts
+++ b/webview/src/app/build.ts
@@ -4,7 +4,7 @@
  *
  * It is one function because the ORDER is the contract — the canvas has to stay
  * within four Tab presses of the top of the document (VIEW-12), the legend is anchored
- * inside the canvas beside the minimap (VIEW-10), and the overlays go on the app
+ * inside the canvas over the phase index's corner (VIEW-10), and the overlays go on the app
  * root so they are never inside the world layer that pans and zooms. Reading
  * those decisions together is the point of keeping them in one place.
  *
@@ -49,7 +49,9 @@ export function buildAppUi(app: App): void {
     onZoom: (dir) => app.view.zoomStep(dir),
     onToggleLegend: (next) => app.setLegend(next),
     onToggleFlow: (next) => app.setFlow(next),
-    onToggleMinimap: (collapsed) => app.setMinimapCollapsed(collapsed),
+    onTogglePhaseIndex: (shown) => app.setPhaseIndexShown(shown),
+    // Viewer M3: the ... menu's Phase overview, as Shift+0 (it closes an open one).
+    onOverview: () => app.toggleOverview(true),
     onToggleRail: () => app.toggleRail(),
     onFitWhole: () => app.view.fitWhole(),
     onZoomToSelection: () => app.zoomToSelection(),
@@ -165,7 +167,7 @@ export function buildAppUi(app: App): void {
   on(app.rail.root, 'pointerdown', () => { app.railChosen = true; });
   on(app.rail.root, 'keydown', () => { app.railChosen = true; });
 
-  // Anchored inside the canvas, beside the minimap, so the key sits with the
+  // Anchored inside the canvas, over the phase index's corner, so the key sits with the
   // picture it explains rather than in a modal over it (VIEW-10).
   app.legend = new Legend((open) => app.setLegend(open));
   shell.canvas.appendChild(app.legend.root);
@@ -224,9 +226,8 @@ export function canvasHost(app: App): CanvasHost {
       app.viewportState = { x: vp.x, y: vp.y, zoom: vp.zoom };
       app.saveSoon();
     },
-    onMinimapCollapsed: () => {
-      // The toolbar carries the accessible copy of this toggle (VIEW-12), so
-      // the pointer affordance inside the panel has to keep it in step.
+    onPhaseIndexChanged: () => {
+      // Viewer M3: the phase index's fold chevron; the ... menu and the saved state follow it.
       renderChrome(app);
       app.saveSoon();
     },
diff --git a/webview/src/app/documents.ts b/webview/src/app/documents.ts
index 327b6b02..eeb9e29a 100644
--- a/webview/src/app/documents.ts
+++ b/webview/src/app/documents.ts
@@ -1,7 +1,7 @@
 /**
  * The DOCUMENT: the graph the canvas draws and the collapse set that goes with it.
  *
- * `setGraph` owns both. Chrome, rail, outline, minimap and layout all read only
+ * `setGraph` owns both. Chrome, rail, outline, phase index and layout all read only
  * the index, so a new document needs no further edits (FEATURES 5.1). Viewer M2
  * removed the scope picker and its projection: the whole document is always drawn.
  */
diff --git a/webview/src/app/keys.ts b/webview/src/app/keys.ts
index 620f4147..11f5abe6 100644
--- a/webview/src/app/keys.ts
+++ b/webview/src/app/keys.ts
@@ -11,12 +11,44 @@
 import { handleCanvasKey } from '../ui/keymap.js';
 import { canvasCommands } from '../ui/commands.js';
 import { commandPortFor } from '../ui/appkeys.js';
+import { renderChrome } from './surfaces.js';
 import type { CommandPort } from '../ui/commands.js';
 import type { App } from '../app.js';
 import type { Issue } from '../types.js';
 
 export function onCanvasKey(app: App, ev: KeyboardEvent): void {
-  handleCanvasKey(ev, canvasCommands(commandPort(app)));
+  const port = commandPort(app);
+  handleCanvasKey(ev, canvasCommands(app.view.overviewOpen ? closingOverview(app, port) : port));
+}
+
+/**
+ * What leaves the phase overview open: the port's questions (asking must not close it), Escape and
+ * Shift+0 (they close it themselves), and the panels that open over it or beside it (the shortcut
+ * sheet, the search, the legend, the side panel and its tabs).
+ */
+const KEEP_OPEN: ReadonlySet = new Set(['walking', 'visibleIssues', 'selectedIssueId', 'dismissTopmost', 'overview',
+  'toggleShortcuts', 'focusSearch', 'toggleLegend', 'toggleRail', 'focusRailTabs']);
+
+/**
+ * Viewer M3: while the phase overview is open, a key the canvas acts on (r, 0, f, n, a severity
+ * toggle…) first closes the overview without moving the diagram, then acts on it, as if the reader
+ * had pressed Escape first. `KEEP_OPEN` lists what does not, and a key the canvas does not answer
+ * leaves the overview open too.
+ */
+function closingOverview(app: App, port: CommandPort): CommandPort {
+  const out = {} as Record;
+  for (const [name, fn] of Object.entries(port)) {
+    out[name] = KEEP_OPEN.has(name)
+      ? fn
+      : (...args: unknown[]) => {
+          if (app.view.overviewOpen) {
+            app.view.closeOverview(false);
+            renderChrome(app);
+          }
+          return (fn as (...a: unknown[]) => unknown)(...args);
+        };
+  }
+  return out as unknown as CommandPort;
 }
 
 /** Everything the keyboard model is allowed to reach (see ui/commands.ts). */
@@ -61,6 +93,13 @@ function commandPort(app: App): CommandPort {
     legendOpen: () => app.legendOpen,
     closeLegend: () => app.setLegend(false),
     toggleFlow: () => app.setFlow(!app.flowOn),
+    closePhasePopover: () => app.view.closePhasePopover(),
+    closeOverview: () => {
+      if (!app.view.closeOverview(true)) return false;
+      renderChrome(app);
+      return true;
+    },
+    toggleOverview: () => app.toggleOverview(),
     walking: () => app.walk.active,
     endWalk: () => app.walk.stop(),
     review: () => app.walk.toggle(),
@@ -75,8 +114,20 @@ function filteredIssues(app: App): Issue[] {
   return app.graph.issues.filter(app.filters.keep);
 }
 
-/** Arrows move the selection among visible siblings, in spatial order. */
+/**
+ * Arrows move the selection among visible siblings, in spatial order. Viewer M3: right after a move
+ * to a phase (the overview, the phase index), the first arrow selects that phase's first step.
+ */
 function moveSelection(app: App, key: string): void {
+  const lane = app.view.takeArrowLane();
+  const first = lane && app.index ? app.index.roots(lane)[0] : undefined;
+  if (first) {
+    const box = app.view.frame ? app.view.frame.boxes.get(first) : undefined;
+    app.select({ kind: 'node', id: first }, { center: !!box && !app.view.viewport.isVisible(box) });
+    const element = app.view.nodeElement(first);
+    if (element) element.focus();
+    return;
+  }
   const sel = app.selection;
   const next = app.view.nextSelection(sel && sel.kind === 'node' ? sel.id : null, key);
   if (!next) return;
diff --git a/webview/src/app/state.ts b/webview/src/app/state.ts
index b88862b6..6562c7ca 100644
--- a/webview/src/app/state.ts
+++ b/webview/src/app/state.ts
@@ -31,7 +31,11 @@ export function applyState(app: App, state: ViewState, rerender: boolean): void
   // saved with; a state the host posts (`restoreState`) applies at once.
   const selection = sanitizeSelection(state.selection);
   if (rerender && selection) app.selection = selection;
-  if (typeof state.minimapCollapsed === 'boolean') app.view.setMinimapCollapsed(state.minimapCollapsed);
+  // Viewer M3: the phase index (it replaced the minimap): folded to its pill, or hidden. A state
+  // saved before M3 with the minimap collapsed opens with the index folded.
+  if (state.phaseIndex === 'folded' || state.phaseIndex === 'hidden') app.view.setPhaseIndex({ folded: state.phaseIndex === 'folded', hidden: state.phaseIndex === 'hidden' });
+  else if (state.phaseIndex === undefined && state.minimapCollapsed === true) app.view.setPhaseIndex({ folded: true });
+  else if (state.phaseIndex === undefined && rerender) app.view.setPhaseIndex({ folded: false, hidden: false });
   if (typeof state.flow === 'boolean') app.setFlow(state.flow);
   if (typeof state.legendOpen === 'boolean') app.setLegend(state.legendOpen);
   // Keys this viewer no longer writes (`railGroupBy`, `answersOpen`, `diffOnly`,
@@ -54,8 +58,10 @@ export function snapshotState(app: App): ViewState {
     collapsed: app.collapsedState.slice(),
     filters: app.filters.snapshot(),
     railTab: app.railTab,
-    minimapCollapsed: app.view.minimapCollapsed,
   };
+  // Viewer M3: absent at its default (shown, unfolded); `minimapCollapsed` is no longer written.
+  if (app.view.phaseIndexHidden) state.phaseIndex = 'hidden';
+  else if (app.view.phaseIndexFolded) state.phaseIndex = 'folded';
   if (!app.flowOn) state.flow = false;
   // Absent at its default, like `flow`: an older host round-trips
   // a state it has never seen, and a newer one restores to the documented
diff --git a/webview/src/app/surfaces.ts b/webview/src/app/surfaces.ts
index 5a5c251c..d6df8582 100644
--- a/webview/src/app/surfaces.ts
+++ b/webview/src/app/surfaces.ts
@@ -53,8 +53,9 @@ export function renderChrome(app: App): void {
     hasSelection: !!app.selection,
     filters: app.filters.value,
     visibleCounts: visibleCounts(app),
-    minimapCollapsed: app.view.minimapCollapsed,
-    minimapUnavailable: app.view.minimapUnavailable(),
+    phaseIndexShown: !app.view.phaseIndexHidden,
+    phaseIndexUnavailable: app.view.phaseIndexUnavailable(),
+    overviewOpen: app.view.overviewOpen,
     railOpen: app.railOpen,
     freshness: freshnessStatus(app.workflowDocument, app.freshness),
     checking: app.freshness.checking,
diff --git a/webview/src/canvas/host.ts b/webview/src/canvas/host.ts
index 1bfcaef3..7cf553a3 100644
--- a/webview/src/canvas/host.ts
+++ b/webview/src/canvas/host.ts
@@ -25,21 +25,18 @@ export const DOUBLE_CLICK_MS = 220;
 export const HOVER_OPEN_MS = 400;
 export const HOVER_CLOSE_MS = 120;
 
-/** The graph size at which an overview earns the corner it occupies (UX_DESIGN §1). */
-export const MINIMAP_MIN_NODES = 30;
-
 /**
- * Below this canvas height the minimap is not drawn (Campaign 3, issue 6): at
- * 270-310 px its 200x132 panel covered the lower right of the diagram.
+ * Viewer M3: the phase index is a panel of rows when the panel is this wide or wider, and a pill
+ * below it (the bottom sheet's layout, beside the code). It replaced the minimap and its rules
+ * (30 or more cards, a panel wider than 900 px).
  */
-export const MINIMAP_MIN_CANVAS_H = 350;
+export const PHASE_INDEX_LIST_MIN_W = 1000;
 
 /**
- * A panel this wide or narrower has no room for the minimap beside the diagram (it was an
- * `@media (max-width: 900px)` rule). Viewer M2 live fix: the App applies it from the panel's
- * width (`CanvasView.setPanelWidth`), so the ... menu can say why the map is not shown.
+ * Below this canvas height the phase index is its pill whatever the width (Campaign 3, issue 6:
+ * a panel over a 270-310 px canvas covered a third of the diagram it was meant to summarise).
  */
-export const MINIMAP_NARROW_W = 900;
+export const PHASE_INDEX_LIST_MIN_H = 350;
 
 export interface CanvasHost {
   /** The App's issue filter — a marker is drawn only for issues this keeps. */
@@ -64,8 +61,8 @@ export interface CanvasHost {
   /** After a collapse/expand: the App re-applies selection, rail and state. */
   afterCollapse(): void;
   onViewportChange(vp: Viewport): void;
-  /** The minimap was collapsed or expanded; the App persists the flag. */
-  onMinimapCollapsed(collapsed: boolean): void;
+  /** Viewer M3: the phase index was folded or unfolded; the App saves it and repaints the menu. */
+  onPhaseIndexChanged(): void;
   onKeyDown(ev: KeyboardEvent): void;
   onBackgroundClick(): void;
   /** The node or connection the current selection points at, kept in view across a resize. */
diff --git a/webview/src/canvasview.ts b/webview/src/canvasview.ts
index 51ddcc66..67224ded 100644
--- a/webview/src/canvasview.ts
+++ b/webview/src/canvasview.ts
@@ -2,7 +2,8 @@
  * The canvas view — everything inside the diagram surface.
  *
  * It owns the layout frame, the routed edges, the scene DOM, the viewport, the
- * minimap, the tooltip and the transient states (hover, focus mode, collapse).
+ * phase index and the phase overview (viewer M3), the tooltip and the transient states (hover,
+ * focus mode, collapse).
  * The App owns the chrome, the rail, the filters and the host protocol, and
  * drives this class through the `CanvasHost` callbacks.
  *
@@ -23,11 +24,15 @@ import { routeEdges, RoutedEdge } from './layout/routing.js';
 import type { Point } from './layout/routing.js';
 import { planLabels, LabelPlan } from './layout/labels.js';
 import { firstBox, nextBox } from './layout/navigate.js';
-import { minimapDots, renderScene } from './render/scene.js';
+import { renderScene } from './render/scene.js';
 import { planScene, ScenePlan, ScenePlanOptions } from './render/plan.js';
 import { markerPoint, nextMountSerial } from './render/edges.js';
 import { BundleBinding } from './render/bundles.js';
-import { FRAME_MIN_ZOOM, LOD_FULL_ZOOM, Minimap, READABLE_ZOOM, ViewportController } from './render/canvas.js';
+import { FRAME_MIN_ZOOM, LOD_FULL_ZOOM, READABLE_ZOOM, ViewportController, phasePlan } from './render/canvas.js';
+import { PhaseIndex } from './render/phaseindex.js';
+import type { PhaseRow } from './render/phaseindex.js';
+import { overviewInput } from './render/phaseoverview.js';
+import { PhaseOverview } from './ui/overview.js';
 import { FlowBinding } from './render/flowbinding.js';
 import { EdgeHover } from './render/edgehover.js';
 import { Tooltip } from './render/tooltip.js';
@@ -35,7 +40,7 @@ import { Toasts, buildEmptyState, buildFilterEmptyState } from './ui/states.js';
 import { wireCanvasGestures } from './ui/shell.js';
 import { Emphasis } from './canvas/emphasis.js';
 import { wireEdgeEvents, wireNodeEvents } from './canvas/wiring.js';
-import { HOVER_CLOSE_MS, HOVER_OPEN_MS, MINIMAP_MIN_CANVAS_H, MINIMAP_MIN_NODES, MINIMAP_NARROW_W } from './canvas/host.js';
+import { HOVER_CLOSE_MS, HOVER_OPEN_MS, PHASE_INDEX_LIST_MIN_H, PHASE_INDEX_LIST_MIN_W } from './canvas/host.js';
 import type { CanvasHost, NextSelection } from './canvas/host.js';
 import type { Shell } from './ui/shell.js';
 import type { Sel, StaleFile, StaleReason } from './types.js';
@@ -58,7 +63,17 @@ export class CanvasView {
   private zoomLevelEl: HTMLElement;
   private stateHost: HTMLElement;
   private tooltip: Tooltip;
-  private minimap: Minimap;
+  /** Viewer M3: the labelled phase index (it replaced the minimap) and the phase overview. */
+  private phaseIndex: PhaseIndex;
+  private overview: PhaseOverview;
+  /** Where the keyboard was when the overview opened, so Escape gives it back. */
+  private overviewReturn: HTMLElement | null = null;
+  /** The panel's width as the App last measured it (0 when it cannot be measured). */
+  private panelWidth = 0;
+  private indexFolded = false;
+  private indexHidden = false;
+  /** Viewer M3: the phase a move to a phase landed on, where the next arrow key starts. */
+  private arrowLane: string | null = null;
 
   private host: CanvasHost;
   private index: GraphIndex | null = null;
@@ -109,20 +124,24 @@ export class CanvasView {
     );
     this.canvasEl.appendChild(this.tooltip.root);
 
-    this.minimap = new Minimap(
-      (x, y) => {
-        const size = this.viewport.size();
-        this.viewport.set({ x: size.w / 2 - x * this.viewport.vp.zoom, y: size.h / 2 - y * this.viewport.vp.zoom });
+    // Viewer M3: the phase index, inside the canvas (so in the bottom sheet's layout it stays above
+    // the sheet) and outside the world layer. Its rows are not Tab stops; the phase overview is
+    // the keyboard's way to the same moves. The viewport treats what it covers as out of view.
+    this.phaseIndex = new PhaseIndex({
+      go: (id) => this.goToPhase(id, { focusCanvas: true }),
+      fold: (folded) => {
+        this.indexFolded = folded;
+        this.syncPhaseIndex();
+        this.host.onPhaseIndexChanged();
       },
-      (collapsed) => this.host.onMinimapCollapsed(collapsed),
-    );
-    // VIEW-12: BEFORE the canvas, and outside it. The minimap duplicates a
-    // diagram that is already fully navigable from the keyboard, so it is
-    // `aria-hidden` — and an `aria-hidden` subtree may not contain a tab stop,
-    // which is why its in-panel chevron is pointer-only and the keyboard's
-    // toggle lives in the toolbar. It is absolutely positioned either way, so
-    // it is drawn exactly where it always was.
-    shell.main.insertBefore(this.minimap.root, this.canvasEl);
+    });
+    this.canvasEl.appendChild(this.phaseIndex.root);
+    // The phase overview (Shift+0): an overlay over the whole canvas, drawn from its own geometry.
+    this.overview = new PhaseOverview({
+      go: (id) => this.goToPhase(id, { focusCanvas: true }),
+      back: () => this.closeOverview(true),
+    });
+    this.canvasEl.appendChild(this.overview.root);
 
     this.toasts = new Toasts();
     this.canvasEl.appendChild(this.toasts.root);
@@ -130,10 +149,11 @@ export class CanvasView {
     this.viewport = new ViewportController(this.canvasEl, this.worldEl, (vp) => {
       this.zoomLevelEl.textContent = Math.round(vp.zoom * 100) + '%';
       const size = this.viewport.size();
-      this.minimap.setViewport(vp, size.w, size.h);
+      this.phaseIndex.setInView(vp, size.w, size.h);
       this.lastArea = this.viewport.visibleArea();
       this.host.onViewportChange(vp);
     });
+    this.viewport.setCovered(() => this.indexCovered());
 
     for (const dispose of wireCanvasGestures(this.canvasEl, this.viewport, {
       onKeyDown: (ev) => this.host.onKeyDown(ev),
@@ -226,35 +246,186 @@ export class CanvasView {
     this.collapsedSet = new Set(ids);
   }
 
-  get minimapCollapsed(): boolean {
-    return this.minimap.collapsed;
+  /* ── the phase index (viewer M3; it replaced the minimap) ─────────────── */
+
+  /** The reader folded the wide phase index to its pill (saved per viewer). */
+  get phaseIndexFolded(): boolean {
+    return this.indexFolded;
+  }
+
+  /** The reader hid the phase index (the ... menu; saved per viewer). */
+  get phaseIndexHidden(): boolean {
+    return this.indexHidden;
+  }
+
+  setPhaseIndex(state: { folded?: boolean; hidden?: boolean }): void {
+    if (typeof state.folded === 'boolean') this.indexFolded = state.folded;
+    if (typeof state.hidden === 'boolean') this.indexHidden = state.hidden;
+    this.syncPhaseIndex();
+  }
+
+  /** The phase index's element (tests and the harness read it). */
+  get phaseIndexElement(): HTMLElement {
+    return this.phaseIndex.root;
   }
 
-  setMinimapCollapsed(collapsed: boolean): void {
-    this.minimap.setCollapsed(collapsed);
+  /** The phases the phase index marks as in view, in drawn order. */
+  phasesInView(): string[] {
+    return this.phaseIndex.inView();
   }
 
   /**
-   * Viewer M2 live fix: the panel's width decides whether the minimap has room (`.is-narrow`,
-   * styles/workflow.css; MINIMAP_NARROW_W). An unmeasurable panel (jsdom, a detached mount)
-   * leaves it as it was.
+   * The panel's width decides the phase index's form: the panel of rows from PHASE_INDEX_LIST_MIN_W
+   * (1000 px), the pill below. An unmeasurable panel (jsdom, a detached mount) keeps the panel.
    */
   setPanelWidth(width: number): void {
     if (!(width > 0)) return;
-    this.minimap.root.classList.toggle('is-narrow', width <= MINIMAP_NARROW_W);
+    this.panelWidth = width;
+    this.syncPhaseIndex();
+  }
+
+  /**
+   * Why the phase index is not drawn now, in words for the ... menu, or null when it is (as the
+   * panel of rows or as the pill). It needs two or more phases; nothing else hides it.
+   */
+  phaseIndexUnavailable(): string | null {
+    return this.phaseIndex.available ? null : 'Shown when the diagram has two or more phases';
+  }
+
+  /** Close the pill's open phase list (an Escape rung); false when it was not open. */
+  closePhasePopover(): boolean {
+    return this.phaseIndex.closePopover();
+  }
+
+  private syncPhaseIndex(): void {
+    const height = this.canvasEl.getBoundingClientRect().height;
+    const wide = !(this.panelWidth > 0) || this.panelWidth >= PHASE_INDEX_LIST_MIN_W;
+    const tall = !(height > 0) || height >= PHASE_INDEX_LIST_MIN_H;
+    this.phaseIndex.setMode({ roomy: wide && tall, folded: this.indexFolded, hidden: this.indexHidden, suppressed: this.overview.open });
+  }
+
+  /** What the phase index covers, in canvas pixels (the viewport keeps targets out of it). */
+  private indexCovered(): { x: number; y: number; w: number; h: number } | null {
+    const r = this.canvasEl.getBoundingClientRect();
+    const size = this.viewport.size();
+    return this.phaseIndex.coveredRect(size.w, size.h, r.width > 0 ? r.left : 0, r.width > 0 ? r.top : 0);
+  }
+
+  private renderPhaseIndex(): void {
+    if (!this.index || !this.frameData) return;
+    const rows: PhaseRow[] = this.frameData.lanes.map((lane) => ({
+      id: lane.id,
+      label: lane.label,
+      index: this.index!.phaseIndexOf(lane.id),
+      steps: lane.nodeCount,
+      counts: this.index!.laneCounts(lane.id, (issue) => this.host.keep(issue)),
+      rect: { x: lane.x, y: lane.y, w: lane.w, h: lane.h },
+    }));
+    this.phaseIndex.setRows(rows);
+    this.syncPhaseIndex();
+    const size = this.viewport.size();
+    this.phaseIndex.setInView(this.viewport.vp, size.w, size.h);
+  }
+
+  /* ── the phase overview (viewer M3, Shift+0) ─────────────────────────── */
+
+  get overviewOpen(): boolean {
+    return this.overview.open;
+  }
+
+  /** The overview's element and layout (tests and the harness read them). */
+  get overviewElement(): HTMLElement {
+    return this.overview.root;
+  }
+
+  overviewLayout() {
+    return this.overview.layout;
+  }
+
+  /**
+   * Open the overview over the canvas, on the phase most in view. The diagram under it does not
+   * move, so closing it is going back to exactly where the reader was. False with no phases.
+   */
+  openOverview(): boolean {
+    if (!this.index || !this.frameData || this.overview.open || !this.index.lanes.length) return false;
+    const doc = this.canvasEl.ownerDocument;
+    const active = doc ? (doc.activeElement as HTMLElement | null) : null;
+    this.overviewReturn = active && active !== doc!.body ? active : null;
+    this.tooltip.hide();
+    const input = overviewInput(this.index, (issue) => this.host.keep(issue));
+    const size = this.viewport.size();
+    const current = this.phaseIndex.currentPhase();
+    const at = Math.max(0, input.phases.findIndex((p) => p.id === current));
+    this.overview.show(input, size.w, size.h, at);
+    this.syncPhaseIndex();
+    const n = input.phases.length;
+    this.host.announce('Phase overview: ' + n + (n === 1 ? ' phase' : ' phases') + ', ' + input.totalSteps + (input.totalSteps === 1 ? ' step' : ' steps') +
+      '. Arrow keys move between phases, Enter goes to one, Escape goes back.');
+    return true;
+  }
+
+  /**
+   * Close the overview. `back` (Escape, Shift+0, the Back button): the keyboard returns to where it
+   * was, and the diagram is as it was. Otherwise (a phase was chosen, another key acted) the caller
+   * decides where the focus goes. False when it was not open.
+   */
+  closeOverview(back: boolean): boolean {
+    if (!this.overview.open) return false;
+    const doc = this.canvasEl.ownerDocument;
+    const hadFocus = !!doc && !!doc.activeElement && this.overview.root.contains(doc.activeElement);
+    this.overview.hide();
+    this.syncPhaseIndex();
+    const target = this.overviewReturn;
+    this.overviewReturn = null;
+    if (back) {
+      this.host.announce('Back to the diagram.');
+      if (hadFocus) this.focusSafely(target && target.isConnected && !this.overview.root.contains(target) ? target : this.canvasEl);
+    } else if (hadFocus) this.focusSafely(this.canvasEl);
+    return true;
+  }
+
+  toggleOverview(): void {
+    if (this.overview.open) this.closeOverview(true);
+    else this.openOverview();
   }
 
   /**
-   * Viewer M2 live fix: why the minimap is not drawn now, in words for the ... menu, or null when
-   * it is drawn (collapsed to its tab or not). Before, the menu showed "Overview map" checked
-   * while the stylesheet hid the map beside the code.
+   * Go to a phase at reading size (`phasePlan`), animated over VIEW_ANIMATION_MS unless motion is
+   * reduced: a block of the overview, or a row of the phase index. The selection is unchanged; the
+   * next arrow key starts at the phase's first step.
    */
-  minimapUnavailable(): string | null {
-    const root = this.minimap.root;
-    if (root.hidden) return 'Shown when ' + MINIMAP_MIN_NODES + ' or more cards are drawn';
-    if (root.classList.contains('is-narrow')) return 'No room in a panel ' + MINIMAP_NARROW_W + ' px wide or narrower';
-    if (root.classList.contains('is-short')) return 'No room in a canvas under ' + MINIMAP_MIN_CANVAS_H + ' px tall';
-    return null;
+  goToPhase(laneId: string, opts: { focusCanvas?: boolean } = {}): void {
+    if (!this.index || !this.frameData) return;
+    const k = this.frameData.lanes.findIndex((lane) => lane.id === laneId);
+    if (k < 0) return;
+    const wasOpen = this.closeOverview(false);
+    const size = this.viewport.size();
+    const plan = phasePlan(this.frameData, k, size.w, size.h);
+    if (plan) this.viewport.animateTo({ x: plan.x, y: plan.y, zoom: plan.zoom });
+    this.arrowLane = laneId;
+    const lane = this.frameData.lanes[k];
+    this.host.announce('Phase ' + (this.index.phaseIndexOf(laneId) + 1) + ': ' + lane.label + ', ' + lane.nodeCount + (lane.nodeCount === 1 ? ' step' : ' steps') + '.');
+    if (opts.focusCanvas || wasOpen) this.focusSafely(this.canvasEl);
+  }
+
+  /** The phase a move to a phase landed on, once (the next arrow key starts there), or null. */
+  takeArrowLane(): string | null {
+    const lane = this.arrowLane;
+    this.arrowLane = null;
+    return lane;
+  }
+
+  /** Forget the arrow start (any selection replaces it). */
+  clearArrowLane(): void {
+    this.arrowLane = null;
+  }
+
+  private focusSafely(target: HTMLElement): void {
+    try {
+      target.focus();
+    } catch (_e) {
+      /* a detached element cannot take focus */
+    }
   }
 
   setStale(files: StaleFile[]): void {
@@ -342,28 +513,25 @@ export class CanvasView {
     // controller's memory and re-stamp the canvas (CONTRACTS 11.14 C1); a
     // latched pulse is re-applied by the applySelection that follows.
     this.flow.clear();
-    this.renderMinimap();
+    this.renderPhaseIndex();
     this.renderEmptyState();
-  }
-
-  private renderMinimap(): void {
-    if (!this.index || !this.frameData) return;
-    const dots = minimapDots(this.index, this.frameData, (issue) => this.host.keep(issue));
-    this.minimap.render(dots, this.frameData.width, this.frameData.height);
-    this.minimap.root.hidden = dots.length < MINIMAP_MIN_NODES;
-    this.syncShortCanvas();
+    // Viewer M3: an open overview follows the new data (a severity toggle changes its F labels).
+    if (this.overview.open && this.index) {
+      const size = this.viewport.size();
+      this.overview.redraw(overviewInput(this.index, (issue) => this.host.keep(issue)), size.w, size.h);
+    }
   }
 
   /**
-   * Issue 6: a 200x132 minimap over a canvas under MINIMAP_MIN_CANVAS_H tall
-   * covers a third of the diagram it is meant to summarise, so it is not drawn
-   * there (`.is-short`, styles/workflow.css). The reader's own collapse choice
-   * is untouched. An unmeasurable canvas (jsdom, before first layout) keeps it.
+   * Issue 6, viewer M3: a canvas under PHASE_INDEX_LIST_MIN_H tall has no room for the panel of
+   * rows, so the phase index is its pill there; an open overview is drawn for the new size.
    */
   private syncShortCanvas(): void {
-    const height = this.canvasEl.getBoundingClientRect().height;
-    if (!(height > 0)) return;
-    this.minimap.root.classList.toggle('is-short', height < MINIMAP_MIN_CANVAS_H);
+    this.syncPhaseIndex();
+    if (this.overview.open && this.index) {
+      const size = this.viewport.size();
+      this.overview.redraw(overviewInput(this.index, (issue) => this.host.keep(issue)), size.w, size.h);
+    }
   }
 
   /**
@@ -538,32 +706,6 @@ export class CanvasView {
     );
   }
 
-  /**
-   * Overview mode (VIEW-10, `Shift+0`): every group folded to its card, then a
-   * WHOLE fit — the picture a reviewer actually wants to paste. The aggregated
-   * severity markers survive, because a collapsed group already carries them.
-   *
-   * Measured on the emitted demo in Chromium after the ANA-1 re-baseline: 22
-   * cards, all of them inside the canvas at 1440x900 and at 1600x1000. VIEW-10's
-   * "<= 14 visible cards" was written against the 45-node demo; the count is a
-   * property of how many top-level units the workspace has, not of this method.
-   */
-  overview(): number {
-    if (!this.index) return 0;
-    const groups: string[] = [];
-    for (const node of this.index.graph.nodes || []) {
-      if (this.index.isGroup(node.id)) groups.push(node.id);
-    }
-    this.collapsedSet = new Set(groups);
-    this.relayout();
-    // fitWhole, not fit: Overview must never take the top-anchored tall branch,
-    // or the whole-diagram picture it exists to produce opens clipped.
-    this.viewport.fitWhole();
-    this.host.afterCollapse();
-    this.host.announce('Overview: ' + groups.length + (groups.length === 1 ? ' group' : ' groups') + ' collapsed, whole diagram fitted.');
-    return groups.length;
-  }
-
   /** Expand every collapsed ancestor of `id`. Returns true when it relaid out. */
   expandAncestors(id: string): boolean {
     if (!this.index) return false;
@@ -776,6 +918,8 @@ export class CanvasView {
   }
 
   destroy(): void {
+    this.phaseIndex.destroy();
+    this.overview.destroy();
     this.emphasis.destroy();
     this.edgeHover.destroy();
     for (const dispose of this.disposers) {
diff --git a/webview/src/icons.ts b/webview/src/icons.ts
index 6d771659..39566b2d 100644
--- a/webview/src/icons.ts
+++ b/webview/src/icons.ts
@@ -185,8 +185,10 @@ const UI_PATHS: Record = {
   /** The legend key (VIEW-10): a list with a swatch beside each row. */
   legend: 'M2.4 3.6h2.4v2.4H2.4ZM2.4 10h2.4v2.4H2.4ZM6.8 4.8h6.8M6.8 11.2h6.8',
   copy: 'M5.8 5.8h7.6v7.6H5.8ZM2.6 10.2V2.6h7.6v3.2',
-  /** The overview minimap: a frame with its viewport. */
-  minimap: 'M2.4 3.6h11.2v8.8H2.4ZM8.4 7.4h4.4v4.4H8.4Z',
+  /** Viewer M3: the phase overview, three stacked blocks joined by a line. */
+  phases: 'M2.6 2.2h10.8v3H2.6ZM2.6 6.5h10.8v3H2.6ZM2.6 10.8h10.8v3H2.6ZM4.6 5.2v1.3M4.6 9.5v1.3',
+  /** Viewer M3: the phase index (it replaced the minimap): numbered rows, one marked. */
+  phaseindex: 'M2.4 3.4h2v2h-2ZM2.4 7h2v2h-2ZM2.4 10.6h2v2h-2ZM6.4 4.4h7.2M6.4 8h7.2M6.4 11.6h7.2',
   /** VIEW-07: a picture in a frame — "export the diagram". */
   image: 'M2.4 3.4h11.2v9.2H2.4ZM2.4 10.6 5.8 7.4l2.4 2.2 2.2-2 3.2 3M10.3 5.3a1.05 1.05 0 1 0 0 2.1 1.05 1.05 0 0 0 0-2.1Z',
   /** Viewer M3: the review walk: a pointer at the first of three rows. */
diff --git a/webview/src/layout/layout.ts b/webview/src/layout/layout.ts
index 5027bb00..eaf52636 100644
--- a/webview/src/layout/layout.ts
+++ b/webview/src/layout/layout.ts
@@ -182,8 +182,8 @@ export function layoutGraph(index: GraphIndex, collapsed: Set): LayoutFr
   // maxContentW` made the world as wide as its widest band and left the others
   // 56-87 % empty, so `fit()` scaled the whole document down to the one lane
   // that needed the room. A lane now ends where its own content ends; the world
-  // is still as wide as the widest lane, which is what the band striping and
-  // the minimap letterbox measure themselves against.
+  // is still as wide as the widest lane, which is what the band striping
+  // measures itself against.
   const width = laneX + maxContentW + CANVAS_MARGIN;
   const height = Math.max(cursorY - LANE_GUTTER + CANVAS_MARGIN, CANVAS_MARGIN * 2);
 
diff --git a/webview/src/render/canvas.ts b/webview/src/render/canvas.ts
index 23eb3bcf..07f10c8c 100644
--- a/webview/src/render/canvas.ts
+++ b/webview/src/render/canvas.ts
@@ -1,14 +1,13 @@
 /**
  * Viewport control: pan by dragging the background, zoom by wheel or buttons,
- * the readable first view, fit, zoom-to-selection, and the minimap. Zoom writes
+ * the readable first view, fit, zoom-to-selection, and (viewer M3) the move to a phase and the
+ * part of the canvas the phase index covers. Zoom writes
  * at most one attribute (data-lod) and one bucketed custom property (--mlv-z)
  * per frame, so no component re-renders and nothing is laid out again while
  * zooming (R4.3).
  */
 
-import { svg, el, iconButton, on } from '../dom.js';
-import { uiIcon } from '../icons.js';
-import { stampPhase } from './phase.js';
+import { motionMode } from '../motion.js';
 import type { Viewport } from '../types.js';
 
 export const MIN_ZOOM = 0.15;
@@ -143,6 +142,72 @@ export function readablePlan(frame: ReadableFrame, w: number, h: number, padding
   return { zoom, x, y, mode: phaseFit ? 'phase-fit' : 'phase-anchor' };
 }
 
+/**
+ * Viewer M3: how long a move to a phase takes (the phase overview's blocks, the phase index's
+ * rows). Instant under VS Code's Reduce Motion, the OS setting or VS Code's screen-reader mode
+ * (`motionMode`).
+ */
+export const VIEW_ANIMATION_MS = 240;
+
+/**
+ * Viewer M3: the view of phase `k` (its position among the lanes) at reading size, as a pure
+ * function of the frame and the canvas size, for the phase overview and the phase index. The rule
+ * is the readable plan's for phase 1: the lane (with the left routing channel, where the trunks
+ * that leave or enter it run) fitted whole when that zoom is PHASE_FIT_MIN_ZOOM (0.75) or more,
+ * capped at READABLE_ZOOM (0.9); otherwise READABLE_ZOOM anchored at its top-left. A document
+ * narrower (or shorter) than the canvas at that zoom is centred on that axis. A lane that fits is
+ * never left with empty canvas under the end of the document: the view stops where the world ends.
+ */
+export function phasePlan(frame: ReadableFrame, k: number, w: number, h: number, padding = 24): ReadablePlan | null {
+  const lane = frame.lanes[k];
+  if (!lane) return null;
+  const contentW = Math.max(1, frame.width);
+  const contentH = Math.max(1, frame.height);
+  const left = lane.x - Math.max(0, frame.channelW || 0);
+  const rectW = Math.max(1, lane.x + lane.w - left);
+  const rectH = Math.max(1, lane.h);
+  const fits = Math.min((w - padding * 2) / rectW, (h - padding * 2) / rectH);
+  const phaseFit = fits >= PHASE_FIT_MIN_ZOOM;
+  const zoom = clamp(phaseFit ? Math.min(fits, READABLE_ZOOM) : READABLE_ZOOM, MIN_ZOOM, MAX_ZOOM);
+  const x = contentW * zoom <= w ? (w - contentW * zoom) / 2 : padding - left * zoom;
+  let y: number;
+  if (contentH * zoom <= h) y = (h - contentH * zoom) / 2;
+  else {
+    y = padding - lane.y * zoom;
+    // The last phases: keep the end of the world at the foot of the canvas when the lane fits.
+    const floor = h - padding - contentH * zoom;
+    if (rectH * zoom + 2 * padding <= h && y < floor) y = floor;
+  }
+  return { zoom, x, y, mode: phaseFit ? 'phase-fit' : 'phase-anchor' };
+}
+
+/** True when two rectangles overlap (touching edges do not). */
+export function rectsOverlap(a: Rect, b: Rect): boolean {
+  return a.x < b.x + b.w && b.x < a.x + a.w && a.y < b.y + b.h && b.y < a.y + a.h;
+}
+
+/**
+ * Viewer M3: the least pan that moves a screen rectangle `r` (canvas pixels) off `covered` while
+ * keeping it inside a `w` x `h` canvas: to the left of it, above it, to its right or below it,
+ * whichever is shortest, with `gap` px to spare. Null when it is already clear, or when no such pan
+ * keeps it inside the canvas (a card wider and taller than the room around the phase index).
+ */
+export function clearOf(r: Rect, covered: Rect, w: number, h: number, gap = 8): { dx: number; dy: number } | null {
+  if (!rectsOverlap(r, covered)) return null;
+  const options: Array<{ dx: number; dy: number }> = [];
+  const left = covered.x - gap - (r.x + r.w);
+  if (r.x + left >= 0) options.push({ dx: left, dy: 0 });
+  const up = covered.y - gap - (r.y + r.h);
+  if (r.y + up >= 0) options.push({ dx: 0, dy: up });
+  const right = covered.x + covered.w + gap - r.x;
+  if (r.x + r.w + right <= w) options.push({ dx: right, dy: 0 });
+  const down = covered.y + covered.h + gap - r.y;
+  if (r.y + r.h + down <= h) options.push({ dx: 0, dy: down });
+  if (!options.length) return null;
+  options.sort((p, q) => Math.abs(p.dx) + Math.abs(p.dy) - (Math.abs(q.dx) + Math.abs(q.dy)));
+  return options[0];
+}
+
 /**
  * A resize this large, in either dimension, refits a viewport the reader has
  * not moved since the last fit (issue 6): the panel opening narrow beside the
@@ -181,6 +246,15 @@ export class ViewportController {
   private fitSize: { w: number; h: number; whole: boolean; padding: number } | null = null;
   /** The frame the readable plan anchors on (viewer M2); null before the first layout. */
   private frame: ReadableFrame | null = null;
+  /**
+   * Viewer M3: the part of the canvas an overlay covers (the phase index), in canvas pixels, read
+   * when it is needed. Reveals, centring and the visibility test keep a target out of it.
+   */
+  private coveredFn: (() => Rect | null) | null = null;
+  /** Viewer M3: bumped by every move, so a running animation stops as soon as anything else moves the view. */
+  private animToken = 0;
+  /** The token of the animation in flight, 0 when none is. */
+  private animLive = 0;
   constructor(canvas: HTMLElement, world: HTMLElement, onChange: (vp: Viewport) => void) {
     this.canvas = canvas;
     this.world = world;
@@ -210,6 +284,7 @@ export class ViewportController {
   }
 
   set(vp: Partial): void {
+    this.animToken++;
     this.fitted = false;
     if (typeof vp.x === 'number' && isFinite(vp.x)) this.vp.x = vp.x;
     if (typeof vp.y === 'number' && isFinite(vp.y)) this.vp.y = vp.y;
@@ -218,6 +293,7 @@ export class ViewportController {
   }
 
   panBy(dx: number, dy: number): void {
+    this.animToken++;
     this.fitted = false;
     this.vp.x += dx;
     this.vp.y += dy;
@@ -226,6 +302,7 @@ export class ViewportController {
 
   /** Zoom about a point in canvas-local coordinates. */
   zoomAt(factor: number, px: number, py: number): void {
+    this.animToken++;
     this.fitted = false;
     const next = clamp(this.vp.zoom * factor, MIN_ZOOM, MAX_ZOOM);
     const k = next / this.vp.zoom;
@@ -272,6 +349,7 @@ export class ViewportController {
   }
 
   private applyFit(padding: number, whole: boolean): void {
+    this.animToken++;
     const { w, h } = this.size();
     if (whole || !this.frame) {
       const { zoom } = fitPlan(this.contentW, this.contentH, w, h, padding);
@@ -311,8 +389,8 @@ export class ViewportController {
   /**
    * A resized canvas (issue 6). A fitted viewport is refitted when the size
    * changed by at least REFIT_MIN_PX and REFIT_MIN_RATIO in either dimension;
-   * anything else only refreshes the derived chrome (zoom readout, minimap
-   * rectangle) without moving what the reader is looking at.
+   * anything else only refreshes the derived chrome (zoom readout, the phase
+   * index's in-view marks) without moving what the reader is looking at.
    */
   onResize(): boolean {
     if (this.fitted && this.fitSize) {
@@ -369,20 +447,45 @@ export class ViewportController {
     const zoom = this.vp.zoom;
     if (zoom >= LOD_FULL_ZOOM && fits >= zoom) {
       this.centerOn(rect);
+      this.keepClear(anchor);
       return;
     }
     const ceiling = zoom >= LOD_FULL_ZOOM ? Math.max(FRAME_MAX_ZOOM, zoom) : readable;
     const next = Math.max(FRAME_MIN_ZOOM, Math.min(ceiling, fits));
     this.centerOn(fits >= FRAME_MIN_ZOOM ? rect : anchor, next);
+    this.keepClear(anchor);
+  }
+
+  /**
+   * Viewer M3: a frame too large to move off the phase index as a whole (`centerOn` leaves it) still
+   * keeps its anchor, the first cited card, out from under the index: the least pan off it.
+   */
+  private keepClear(anchor: Rect): void {
+    const covered = this.covered();
+    if (!covered) return;
+    const { w, h } = this.visibleArea();
+    const z = this.vp.zoom;
+    const shift = clearOf({ x: anchor.x * z + this.vp.x, y: anchor.y * z + this.vp.y, w: anchor.w * z, h: anchor.h * z }, covered, w, h);
+    if (shift) this.panBy(shift.dx, shift.dy);
   }
 
   centerOn(rect: Rect, zoom?: number): void {
+    this.animToken++;
     this.fitted = false;
     const { w, h } = this.visibleArea();
     if (typeof zoom === 'number') this.vp.zoom = clamp(zoom, MIN_ZOOM, MAX_ZOOM);
     const z = this.vp.zoom;
     this.vp.x = w / 2 - (rect.x + rect.w / 2) * z;
     this.vp.y = h / 2 - (rect.y + rect.h / 2) * z;
+    // Viewer M3: a centred target the phase index would cover moves the least distance off it.
+    const covered = this.covered();
+    if (covered) {
+      const shift = clearOf({ x: rect.x * z + this.vp.x, y: rect.y * z + this.vp.y, w: rect.w * z, h: rect.h * z }, covered, w, h);
+      if (shift) {
+        this.vp.x += shift.dx;
+        this.vp.y += shift.dy;
+      }
+    }
     this.apply();
   }
 
@@ -402,8 +505,17 @@ export class ViewportController {
       if (start + size > extent) return extent - pad - (start + size);
       return 0;
     };
-    const dx = shift(rect.x * z + this.vp.x, rect.w * z, w);
-    const dy = shift(rect.y * z + this.vp.y, rect.h * z, h);
+    let dx = shift(rect.x * z + this.vp.x, rect.w * z, w);
+    let dy = shift(rect.y * z + this.vp.y, rect.h * z, h);
+    // Viewer M3: and off the part of the canvas the phase index covers, the least distance again.
+    const covered = this.covered();
+    if (covered) {
+      const off = clearOf({ x: rect.x * z + this.vp.x + dx, y: rect.y * z + this.vp.y + dy, w: rect.w * z, h: rect.h * z }, covered, w, h, Math.min(margin, 8));
+      if (off) {
+        dx += off.dx;
+        dy += off.dy;
+      }
+    }
     if (dx || dy) this.panBy(dx, dy);
   }
 
@@ -413,167 +525,88 @@ export class ViewportController {
     this.centerOn(rect, z);
   }
 
-  /** True when the rect is fully inside the visible area (by default the current one). */
+  /**
+   * True when the rect is fully inside the visible area (by default the current one). Viewer M3: and
+   * not under the phase index, so a card the index covers counts as out of view and is revealed.
+   */
   isVisible(rect: Rect, area: { w: number; h: number } = this.visibleArea()): boolean {
     const { w, h } = area;
     const x = rect.x * this.vp.zoom + this.vp.x;
     const y = rect.y * this.vp.zoom + this.vp.y;
-    return x >= 0 && y >= 0 && x + rect.w * this.vp.zoom <= w && y + rect.h * this.vp.zoom <= h;
+    const sw = rect.w * this.vp.zoom;
+    const sh = rect.h * this.vp.zoom;
+    if (!(x >= 0 && y >= 0 && x + sw <= w && y + sh <= h)) return false;
+    const covered = this.covered();
+    return !covered || !rectsOverlap({ x, y, w: sw, h: sh }, covered);
   }
-}
-
-export function clamp(v: number, lo: number, hi: number): number {
-  return v < lo ? lo : v > hi ? hi : v;
-}
 
-export interface MinimapDot {
-  x: number;
-  y: number;
-  w: number;
-  h: number;
-  stage: string;
-  /** Viewer M2: the phase's document position, the key of its colour. */
-  phase?: number;
-  severity: string | null;
-}
-
-/**
- * The minimap's drawing transform: a uniform letterboxed fit, CENTRED in the
- * widget. Drawing, the viewport rectangle and click-to-jump all go through this
- * one object — they used to disagree, so a click landed nowhere near the dot
- * under the cursor (MLV-R1-008).
- */
-export interface MinimapFit {
-  scale: number;
-  ox: number;
-  oy: number;
-  w: number;
-  h: number;
-  contentW: number;
-  contentH: number;
-}
-
-export function minimapFit(w: number, h: number, contentW: number, contentH: number): MinimapFit {
-  const cw = Math.max(1, contentW);
-  const ch = Math.max(1, contentH);
-  const scale = Math.min(w / cw, h / ch);
-  return { scale, ox: (w - cw * scale) / 2, oy: (h - ch * scale) / 2, w, h, contentW: cw, contentH: ch };
-}
-
-/** Widget coordinates (viewBox units) -> world coordinates, clamped to content. */
-export function minimapToWorld(fit: MinimapFit, vx: number, vy: number): { x: number; y: number } {
-  return {
-    x: clamp((vx - fit.ox) / fit.scale, 0, fit.contentW),
-    y: clamp((vy - fit.oy) / fit.scale, 0, fit.contentH),
-  };
-}
-
-/** World coordinates -> widget coordinates. The inverse of minimapToWorld. */
-export function minimapFromWorld(fit: MinimapFit, x: number, y: number): { x: number; y: number } {
-  return { x: fit.ox + x * fit.scale, y: fit.oy + y * fit.scale };
-}
-
-export class Minimap {
-  readonly root: HTMLElement;
-  private svgEl: SVGElement;
-  private nodesG: SVGElement;
-  private viewRect: SVGElement;
-  private toggleBtn: HTMLButtonElement;
-  private collapsedState = false;
-  private w = 200;
-  private h = 130;
-  private fit: MinimapFit = minimapFit(200, 130, 1, 1);
-
-  constructor(onJump: (x: number, y: number) => void, onToggle?: (collapsed: boolean) => void) {
-    this.root = el('div', 'mlv-minimap');
-    // VIEW-12. The minimap is a DUPLICATE of a canvas that is already fully
-    // navigable — one focus stop, `aria-activedescendant` roving, a live region
-    // announcing every selection — so it is hidden from assistive tech rather
-    // than described twice.
-    this.root.setAttribute('aria-hidden', 'true');
-    // The widget sits on top of live diagram, so it must be dismissable
-    // (UX_DESIGN section 1: "collapsible to a 28 px chevron tab") — MLV-R2-W12.
-    this.toggleBtn = iconButton('mlv-btn mlv-btn--icon mlv-minimap__toggle', 'Collapse minimap');
-    this.toggleBtn.appendChild(uiIcon('chevron', 12));
-    this.toggleBtn.setAttribute('aria-expanded', 'true');
-    // ...and an `aria-hidden` subtree may not hold a tab stop, so this chevron
-    // is the POINTER affordance only. The keyboard's copy of it is the labelled
-    // "Minimap" toggle in the toolbar, which is before the canvas in DOM order
-    // instead of the tab stop after it that this button used to be (VIEW-12).
-    this.toggleBtn.tabIndex = -1;
-    on(this.toggleBtn, 'click', (ev: MouseEvent) => {
-      ev.preventDefault();
-      ev.stopPropagation();
-      this.setCollapsed(!this.collapsedState);
-      if (onToggle) onToggle(this.collapsedState);
-    });
-    this.root.appendChild(this.toggleBtn);
-    this.svgEl = svg('svg', { class: 'mlv-minimap__svg', viewBox: '0 0 200 130', 'aria-hidden': 'true' });
-    this.nodesG = svg('g');
-    this.viewRect = svg('rect', { class: 'mlv-minimap__view', x: 0, y: 0, width: 0, height: 0, rx: 2 });
-    this.svgEl.appendChild(this.nodesG);
-    this.svgEl.appendChild(this.viewRect);
-    this.root.appendChild(this.svgEl);
-    this.svgEl.addEventListener('pointerdown', (ev: Event) => {
-      const e = ev as PointerEvent;
-      const box = (this.svgEl as unknown as HTMLElement).getBoundingClientRect();
-      // The widget is drawn in viewBox units; convert the click into those units
-      // first, then invert the SAME transform the dots were drawn with.
-      const vx = box.width ? ((e.clientX - box.left) / box.width) * this.w : 0;
-      const vy = box.height ? ((e.clientY - box.top) / box.height) * this.h : 0;
-      const world = minimapToWorld(this.fit, vx, vy);
-      onJump(world.x, world.y);
-    });
+  /** Viewer M3: say what part of the canvas is covered (the phase index), read on demand. */
+  setCovered(fn: (() => Rect | null) | null): void {
+    this.coveredFn = fn;
   }
 
-  get collapsed(): boolean {
-    return this.collapsedState;
-  }
-
-  setCollapsed(next: boolean): void {
-    this.collapsedState = next;
-    if (next) this.root.classList.add('is-collapsed');
-    else this.root.classList.remove('is-collapsed');
-    this.toggleBtn.setAttribute('aria-expanded', next ? 'false' : 'true');
-    const label = next ? 'Expand minimap' : 'Collapse minimap';
-    this.toggleBtn.title = label;
-    this.toggleBtn.setAttribute('aria-label', label);
+  /** The covered part of the canvas now, or null. */
+  covered(): Rect | null {
+    if (!this.coveredFn) return null;
+    try {
+      const r = this.coveredFn();
+      return r && r.w > 0 && r.h > 0 ? r : null;
+    } catch (_e) {
+      return null;
+    }
   }
 
-  render(dots: MinimapDot[], contentW: number, contentH: number): void {
-    this.fit = minimapFit(this.w, this.h, contentW, contentH);
-    const { scale, ox, oy } = this.fit;
-    while (this.nodesG.firstChild) this.nodesG.removeChild(this.nodesG.firstChild);
-    for (const d of dots) {
-      const r = svg('rect', {
-        class: 'mlv-minimap__node' + (d.severity ? ' mlv-minimap__node--issue' : ''),
-        x: round2(ox + d.x * scale),
-        y: round2(oy + d.y * scale),
-        width: round2(Math.max(2, d.w * scale)),
-        height: round2(Math.max(2, d.h * scale)),
-        rx: 1,
-      });
-      r.setAttribute('data-stage', d.stage);
-      if (d.phase !== undefined) stampPhase(r, d.phase);
-      if (d.severity) r.setAttribute('data-sev', d.severity);
-      this.nodesG.appendChild(r);
+  /**
+   * Viewer M3: move to `target` over VIEW_ANIMATION_MS (the move to a phase), or at once under
+   * reduced motion (VS Code's Reduce Motion, the OS setting, VS Code's screen-reader mode) or where
+   * there is no animation frame. The point at the canvas centre travels in a straight line while
+   * the zoom changes on a log scale, eased out. Any other move (a pan, a wheel, a key, a reveal)
+   * stops it where it is. Returns once the move is set up; `done` runs when it lands (not when it
+   * is stopped).
+   */
+  animateTo(target: Viewport, ms = VIEW_ANIMATION_MS, done?: () => void): void {
+    const token = ++this.animToken;
+    this.fitted = false;
+    const to: Viewport = { x: target.x, y: target.y, zoom: clamp(target.zoom, MIN_ZOOM, MAX_ZOOM) };
+    const raf = typeof window !== 'undefined' && typeof window.requestAnimationFrame === 'function' ? window.requestAnimationFrame.bind(window) : null;
+    const land = () => {
+      this.animLive = 0;
+      this.vp = { ...to };
+      this.apply();
+      if (done) done();
+    };
+    if (!raf || !(ms > 0) || motionMode() === 'reduced') {
+      land();
+      return;
     }
+    const from: Viewport = { ...this.vp };
+    const { w, h } = this.size();
+    const c0 = { x: (w / 2 - from.x) / from.zoom, y: (h / 2 - from.y) / from.zoom };
+    const c1 = { x: (w / 2 - to.x) / to.zoom, y: (h / 2 - to.y) / to.zoom };
+    const start = Date.now();
+    this.animLive = token;
+    const frame = () => {
+      if (token !== this.animToken) return;
+      const t = Math.min(1, (Date.now() - start) / ms);
+      if (t >= 1) {
+        land();
+        return;
+      }
+      const e = 1 - Math.pow(1 - t, 3);
+      const z = from.zoom * Math.pow(to.zoom / from.zoom, e);
+      this.vp = { x: w / 2 - (c0.x + (c1.x - c0.x) * e) * z, y: h / 2 - (c0.y + (c1.y - c0.y) * e) * z, zoom: z };
+      this.apply();
+      raf(frame);
+    };
+    raf(frame);
   }
 
-  setViewport(vp: Viewport, viewW: number, viewH: number): void {
-    const { scale, ox, oy } = this.fit;
-    const topLeft = minimapFromWorld(this.fit, -vp.x / vp.zoom, -vp.y / vp.zoom);
-    const w = (viewW / vp.zoom) * scale;
-    const h = (viewH / vp.zoom) * scale;
-    const x = clamp(topLeft.x, ox, ox + this.fit.contentW * scale);
-    const y = clamp(topLeft.y, oy, oy + this.fit.contentH * scale);
-    this.viewRect.setAttribute('x', String(round2(x)));
-    this.viewRect.setAttribute('y', String(round2(y)));
-    this.viewRect.setAttribute('width', String(round2(Math.max(0, Math.min(w, ox + this.fit.contentW * scale - x)))));
-    this.viewRect.setAttribute('height', String(round2(Math.max(0, Math.min(h, oy + this.fit.contentH * scale - y)))));
+  /** True while an `animateTo` is under way (not landed, not stopped by another move). */
+  get animating(): boolean {
+    return this.animLive !== 0 && this.animLive === this.animToken;
   }
 }
 
-function round2(v: number): number {
-  return Math.round(v * 100) / 100;
+export function clamp(v: number, lo: number, hi: number): number {
+  return v < lo ? lo : v > hi ? hi : v;
 }
diff --git a/webview/src/render/edgehover.ts b/webview/src/render/edgehover.ts
index f898cf23..1a992f59 100644
--- a/webview/src/render/edgehover.ts
+++ b/webview/src/render/edgehover.ts
@@ -30,7 +30,7 @@ import type { ViewportController } from './canvas.js';
 export const EDGE_PICK_PX = 10;
 
 /** Anything on this list owns its own pixels outright; cables never win there. */
-const OPAQUE = '.mlv-node, .mlv-group, .mlv-minimap, .mlv-zoom, .mlv-tooltip, .mlv-toasts, .mlv-state';
+const OPAQUE = '.mlv-node, .mlv-group, .mlv-phaseindex, .mlv-overview, .mlv-zoom, .mlv-tooltip, .mlv-toasts, .mlv-state';
 
 export interface EdgeHoverHost {
   canvas: HTMLElement;
diff --git a/webview/src/render/phase.ts b/webview/src/render/phase.ts
index d9ea63ff..1040fe7e 100644
--- a/webview/src/render/phase.ts
+++ b/webview/src/render/phase.ts
@@ -1,7 +1,7 @@
 /**
  * Viewer M2: phase colour by document order.
  *
- * Every element drawn for a phase (lane, card, group, connection, trunk, minimap dot)
+ * Every element drawn for a phase (lane, card, group, connection, trunk, phase-index row)
  * carries `data-phase-index` (its phase's 0-based position in the document) and `data-phase-tone`
  * (that position modulo `PHASE_TONES`). The stylesheet binds `--mlv-stage` from the tone
  * (styles/node.css), so the colour never depends on how the author spelled the phase id: the
diff --git a/webview/src/render/phaseindex.ts b/webview/src/render/phaseindex.ts
new file mode 100644
index 00000000..640c18b5
--- /dev/null
+++ b/webview/src/render/phaseindex.ts
@@ -0,0 +1,381 @@
+/**
+ * Viewer M3, roadmap step 13: the labelled phase index. It replaces the unlabelled minimap.
+ *
+ * A panel in the lower right corner of the canvas with one row per phase: the phase number (in
+ * its colour), the label, the findings touching it by severity (the PR #14 rule: a finding on two
+ * phases counts in both) and its step count. The phases in view are marked. A click on a row goes
+ * to that phase at reading size (the same move as the phase overview's blocks).
+ *
+ * Below 1000 px (and on a canvas under 350 px tall) it is a pill instead: "4/6 Objective,
+ * optimizer & scheduler ▴", the phase most in view. The pill opens the rows above itself. Wide,
+ * the panel's chevron folds it to the pill and the pill unfolds it. The ... menu shows or hides it.
+ *
+ * It never hides the card the keyboard is on: `coveredRect` is the part of the canvas it covers,
+ * and the viewport's reveal, centring and visibility test keep a target out of it
+ * (`ViewportController.setCovered`). It sits inside the canvas, so in the bottom sheet's layout it
+ * stays above the sheet (and above the review walk's bar), never on it.
+ *
+ * Keyboard: its rows are not Tab stops; the phase overview (Shift+0) is the keyboard's way to the
+ * same moves, with arrows between phases. The rows are labelled buttons, so a screen reader can
+ * still read and press them.
+ */
+
+import { add, clear, el, on } from '../dom.js';
+import { uiIcon } from '../icons.js';
+import { clusterTitle, countsTotal, severityCluster } from '../markers.js';
+import { stampPhase } from './phase.js';
+import type { IssueCounts, Viewport } from '../types.js';
+
+export interface PhaseRow {
+  id: string;
+  label: string;
+  /** The phase's position among the declared phases (0-based): its number and colour. */
+  index: number;
+  steps: number;
+  /** Findings touching the phase, by severity (PR #14). */
+  counts: IssueCounts;
+  /** The lane's box in world coordinates. */
+  rect: { x: number; y: number; w: number; h: number };
+}
+
+export interface CoveredRect {
+  x: number;
+  y: number;
+  w: number;
+  h: number;
+}
+
+/** Panel width, row and head heights, the pill's height and widest size, and the corner margin (CSS px). */
+export const INDEX_W = 288;
+export const INDEX_HEAD_H = 26;
+export const INDEX_ROW_H = 24;
+export const INDEX_PAD_Y = 4;
+export const PILL_H = 28;
+export const PILL_MAX_W = 360;
+export const INDEX_MARGIN = 12;
+/** The gap between the pill and the rows it opens above itself. */
+export const POPOVER_GAP = 4;
+
+/** Which phases a viewport shows, and the one it shows most of. */
+export interface PhasesInView {
+  ids: string[];
+  /** The phase with the largest visible area; null when none is visible. */
+  current: string | null;
+}
+
+/**
+ * The phases whose lanes intersect the canvas at this viewport, and the one the reader is looking
+ * at: the highest score of (share of the canvas the lane fills) + (share of the lane that is in
+ * view), the first of equals. Either share alone misleads: by area a tall lane wins while a short
+ * phase the reader just moved to is wholly on screen under it; by share a sliver of a small lane
+ * in a corner would win over the lane that fills the canvas. Pure.
+ */
+export function phasesInView(rows: readonly PhaseRow[], vp: Viewport, w: number, h: number): PhasesInView {
+  const ids: string[] = [];
+  let current: string | null = null;
+  let best = 0;
+  const canvas = Math.max(1, w * h);
+  for (const row of rows) {
+    const x0 = Math.max(0, row.rect.x * vp.zoom + vp.x);
+    const y0 = Math.max(0, row.rect.y * vp.zoom + vp.y);
+    const x1 = Math.min(w, (row.rect.x + row.rect.w) * vp.zoom + vp.x);
+    const y1 = Math.min(h, (row.rect.y + row.rect.h) * vp.zoom + vp.y);
+    const area = Math.max(0, x1 - x0) * Math.max(0, y1 - y0);
+    if (area <= 0) continue;
+    ids.push(row.id);
+    const lane = Math.max(1, row.rect.w * row.rect.h * vp.zoom * vp.zoom);
+    const score = area / canvas + area / lane;
+    if (score > best + 1e-9) {
+      best = score;
+      current = row.id;
+    }
+  }
+  return { ids, current };
+}
+
+/** "2 findings touch this phase", or '' when none does. */
+function findingsWords(counts: IssueCounts): string {
+  const total = countsTotal(counts);
+  if (!total) return '';
+  return total + (total === 1 ? ' finding touches this phase' : ' findings touch this phase');
+}
+
+const steps = (n: number): string => n + (n === 1 ? ' step' : ' steps');
+
+/** The highest phase number shown, the denominator of "4/6". */
+function lastNumber(rows: readonly PhaseRow[]): number {
+  let last = rows.length;
+  for (const row of rows) last = Math.max(last, row.index + 1);
+  return last;
+}
+
+export interface PhaseIndexCallbacks {
+  /** A row was chosen: go to that phase. */
+  go(id: string): void;
+  /** The wide panel was folded to its pill, or unfolded (saved per viewer). */
+  fold(folded: boolean): void;
+}
+
+export interface PhaseIndexMode {
+  /** Room for the panel: a panel 1000 px wide or wider and a canvas 350 px tall or taller. */
+  roomy: boolean;
+  /** The reader folded the panel to its pill. */
+  folded: boolean;
+  /** The reader hid the index (the ... menu). */
+  hidden: boolean;
+  /** Something covers the whole canvas (the phase overview). */
+  suppressed: boolean;
+}
+
+export class PhaseIndex {
+  readonly root: HTMLElement;
+  private panel: HTMLElement;
+  private headSteps: HTMLElement;
+  private foldBtn: HTMLButtonElement;
+  private rowsEl: HTMLElement;
+  private pill: HTMLButtonElement;
+  private pillNum: HTMLElement;
+  private pillLabel: HTMLElement;
+  private cb: PhaseIndexCallbacks;
+  private rowsData: PhaseRow[] = [];
+  private rowEls = new Map();
+  private mode: PhaseIndexMode = { roomy: true, folded: false, hidden: false, suppressed: false };
+  private popover = false;
+  private inViewKey = '';
+  private currentId: string | null = null;
+  private disposers: (() => void)[] = [];
+
+  constructor(cb: PhaseIndexCallbacks) {
+    this.cb = cb;
+    this.root = el('nav', 'mlv-phaseindex');
+    this.root.setAttribute('aria-label', 'Phase index');
+    this.root.hidden = true;
+
+    this.panel = add(this.root, el('div', 'mlv-phaseindex__panel'));
+    const head = add(this.panel, el('div', 'mlv-phaseindex__head'));
+    add(head, el('span', 'mlv-phaseindex__title', 'Phases'));
+    this.headSteps = add(head, el('span', 'mlv-phaseindex__total'));
+    this.foldBtn = add(head, el('button', 'mlv-btn mlv-btn--icon mlv-phaseindex__fold')) as HTMLButtonElement;
+    this.foldBtn.type = 'button';
+    this.foldBtn.tabIndex = -1;
+    this.foldBtn.setAttribute('aria-label', 'Fold the phase index');
+    this.foldBtn.title = 'Fold the phase index to one line';
+    this.foldBtn.appendChild(uiIcon('chevron', 12));
+    on(this.foldBtn, 'click', (ev: MouseEvent) => {
+      ev.preventDefault();
+      ev.stopPropagation();
+      this.cb.fold(true);
+    });
+    this.rowsEl = add(this.panel, el('ol', 'mlv-phaseindex__rows'));
+
+    this.pill = add(this.root, el('button', 'mlv-phaseindex__pill')) as HTMLButtonElement;
+    this.pill.type = 'button';
+    this.pill.tabIndex = -1;
+    this.pill.setAttribute('aria-expanded', 'false');
+    this.pillNum = add(this.pill, el('span', 'mlv-phaseindex__pillnum'));
+    this.pillLabel = add(this.pill, el('span', 'mlv-phaseindex__pilllabel'));
+    const chevron = uiIcon('chevron', 12);
+    chevron.setAttribute('class', 'mlv-uicon mlv-phaseindex__pillchev');
+    this.pill.appendChild(chevron);
+    on(this.pill, 'click', (ev: MouseEvent) => {
+      ev.preventDefault();
+      ev.stopPropagation();
+      if (this.mode.roomy && this.mode.folded) this.cb.fold(false);
+      else this.setPopover(!this.popover);
+    });
+
+    // Enter and Space press the focused row or pill themselves; the canvas under the index must
+    // not also read them as "open the selection". A long index scrolls itself, not the diagram.
+    this.disposers.push(on(this.root, 'keydown', (ev: KeyboardEvent) => {
+      if (ev.key === 'Enter' || ev.key === ' ') ev.stopPropagation();
+    }));
+    this.disposers.push(on(this.panel, 'wheel', (ev: WheelEvent) => ev.stopPropagation()));
+    const doc = typeof document === 'undefined' ? null : document;
+    if (doc) {
+      this.disposers.push(on(doc, 'pointerdown', (ev: PointerEvent) => {
+        if (!this.popover) return;
+        const target = ev.target as Node | null;
+        if (target && this.root.contains(target)) return;
+        this.setPopover(false);
+      }));
+    }
+  }
+
+  /** The rows, as the canvas draws its lanes. */
+  setRows(rows: PhaseRow[]): void {
+    this.rowsData = rows;
+    this.rowEls.clear();
+    clear(this.rowsEl);
+    const total = rows.reduce((sum, row) => sum + row.steps, 0);
+    this.headSteps.textContent = steps(total);
+    const last = lastNumber(rows);
+    for (const row of rows) {
+      const li = add(this.rowsEl, el('li', 'mlv-phaseindex__item'));
+      const btn = add(li, el('button', 'mlv-phaseindex__row')) as HTMLButtonElement;
+      btn.type = 'button';
+      btn.tabIndex = -1;
+      btn.setAttribute('data-phase-id', row.id);
+      stampPhase(btn, row.index);
+      add(btn, el('span', 'mlv-phaseindex__num', String(row.index + 1))).setAttribute('aria-hidden', 'true');
+      add(btn, el('span', 'mlv-phaseindex__label', row.label));
+      const cluster = severityCluster(row.counts, 11, findingsWords(row.counts));
+      if (cluster) {
+        cluster.classList.add('mlv-phaseindex__sev');
+        cluster.setAttribute('aria-hidden', 'true');
+        cluster.title = findingsWords(row.counts) + ' (' + clusterTitle(row.counts) + ')';
+        btn.appendChild(cluster);
+      }
+      add(btn, el('span', 'mlv-phaseindex__steps', steps(row.steps))).setAttribute('aria-hidden', 'true');
+      btn.setAttribute('data-name', 'Phase ' + (row.index + 1) + ' of ' + last + ': ' + row.label + ', ' + steps(row.steps) +
+        (countsTotal(row.counts) ? ', ' + findingsWords(row.counts) + ' (' + clusterTitle(row.counts).replace(/^\d+ findings?: /, '') + ')' : ''));
+      btn.title = btn.getAttribute('data-name') + '. Go to this phase.';
+      on(btn, 'click', (ev: MouseEvent) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+        this.setPopover(false);
+        this.cb.go(row.id);
+      });
+      this.rowEls.set(row.id, btn);
+    }
+    this.inViewKey = '\u0000';
+    this.applyMode();
+  }
+
+  get rows(): readonly PhaseRow[] {
+    return this.rowsData;
+  }
+
+  setMode(mode: Partial): void {
+    this.mode = { ...this.mode, ...mode };
+    this.applyMode();
+  }
+
+  /** Whether the index has anything to show: two or more phases. */
+  get available(): boolean {
+    return this.rowsData.length >= 2;
+  }
+
+  /** The form on screen: the panel, the pill, or nothing. */
+  get form(): 'list' | 'pill' | 'none' {
+    if (this.root.hidden) return 'none';
+    return this.root.getAttribute('data-form') === 'list' ? 'list' : 'pill';
+  }
+
+  get popoverOpen(): boolean {
+    return this.popover && this.form === 'pill';
+  }
+
+  /** Close the pill's open rows; false when they were not open (an Escape rung). */
+  closePopover(): boolean {
+    if (!this.popoverOpen) return false;
+    this.setPopover(false);
+    return true;
+  }
+
+  private setPopover(open: boolean): void {
+    this.popover = open;
+    this.applyMode();
+  }
+
+  private applyMode(): void {
+    const m = this.mode;
+    const hidden = m.hidden || m.suppressed || !this.available;
+    this.root.hidden = hidden;
+    const list = m.roomy && !m.folded;
+    if (list || hidden) this.popover = false;
+    this.root.setAttribute('data-form', list ? 'list' : 'pill');
+    if (this.popover) this.root.setAttribute('data-open', 'true');
+    else this.root.removeAttribute('data-open');
+    this.panel.hidden = !list && !this.popover;
+    this.pill.hidden = list;
+    this.pill.setAttribute('aria-expanded', this.popover ? 'true' : 'false');
+    const unfold = m.roomy && m.folded;
+    this.pill.title = unfold ? 'Unfold the phase index' : this.popover ? 'Close the phase list' : 'Show every phase';
+    this.syncPill();
+  }
+
+  /** Mark the phases this viewport shows; only a change of the set touches the DOM. */
+  setInView(vp: Viewport, w: number, h: number): void {
+    const view = phasesInView(this.rowsData, vp, w, h);
+    const key = view.ids.join('\u0000') + '\u0001' + (view.current || '');
+    if (key === this.inViewKey) return;
+    this.inViewKey = key;
+    this.currentId = view.current;
+    const shown = new Set(view.ids);
+    for (const [id, btn] of this.rowEls) {
+      const on_ = shown.has(id);
+      if (on_) btn.setAttribute('data-in-view', 'true');
+      else btn.removeAttribute('data-in-view');
+      btn.setAttribute('aria-label', (btn.getAttribute('data-name') || '') + (on_ ? ', in view' : ''));
+    }
+    this.syncPill();
+  }
+
+  /** The phase the viewport shows most of, or null. */
+  currentPhase(): string | null {
+    return this.currentId;
+  }
+
+  /** The phases marked in view, in drawn order (tests and the harness read it). */
+  inView(): string[] {
+    const out: string[] = [];
+    for (const [id, btn] of this.rowEls) if (btn.getAttribute('data-in-view') === 'true') out.push(id);
+    return out;
+  }
+
+  private syncPill(): void {
+    const rows = this.rowsData;
+    const last = lastNumber(rows);
+    const row = rows.find((r) => r.id === this.currentId) || null;
+    this.pillNum.textContent = row ? row.index + 1 + '/' + last : String(rows.length);
+    this.pillLabel.textContent = row ? row.label : rows.length === 1 ? 'phase' : 'phases';
+    this.pill.setAttribute('aria-label', (row ? 'Phase ' + (row.index + 1) + ' of ' + last + ' in view: ' + row.label : rows.length + ' phases') +
+      '. ' + (this.mode.roomy && this.mode.folded ? 'Unfold the phase index.' : this.popover ? 'Close the phase list.' : 'Show every phase.'));
+  }
+
+  /**
+   * The part of the canvas the index covers, in canvas pixels, or null when it is not shown. Read
+   * from the boxes on screen when the host lays them out; otherwise (jsdom, before layout) from the
+   * same sizes the stylesheet gives them, the pill at its widest.
+   */
+  coveredRect(canvasW: number, canvasH: number, canvasLeft = 0, canvasTop = 0): CoveredRect | null {
+    if (this.root.hidden || !(canvasW > 0) || !(canvasH > 0)) return null;
+    const parts: CoveredRect[] = [];
+    for (const part of [this.panel, this.pill]) {
+      if (part.hidden) continue;
+      const r = part.getBoundingClientRect();
+      if (r.width > 0 && r.height > 0) parts.push({ x: r.left - canvasLeft, y: r.top - canvasTop, w: r.width, h: r.height });
+    }
+    if (!parts.length) {
+      const m = INDEX_MARGIN;
+      const listH = INDEX_HEAD_H + this.rowsData.length * INDEX_ROW_H + 2 * INDEX_PAD_Y;
+      if (this.root.getAttribute('data-form') === 'list') {
+        const w = Math.min(INDEX_W, canvasW - 2 * m);
+        const h = Math.min(listH, canvasH - 2 * m);
+        parts.push({ x: canvasW - m - w, y: canvasH - m - h, w, h });
+      } else {
+        const w = Math.min(PILL_MAX_W, canvasW - 2 * m);
+        parts.push({ x: canvasW - m - w, y: canvasH - m - PILL_H, w, h: PILL_H });
+        if (this.popover) {
+          const pw = Math.min(INDEX_W, canvasW - 2 * m);
+          const ph = Math.min(listH, Math.max(0, canvasH - 2 * m - PILL_H - POPOVER_GAP));
+          parts.push({ x: canvasW - m - pw, y: canvasH - m - PILL_H - POPOVER_GAP - ph, w: pw, h: ph });
+        }
+      }
+    }
+    const x = Math.min(...parts.map((p) => p.x));
+    const y = Math.min(...parts.map((p) => p.y));
+    return { x, y, w: Math.max(...parts.map((p) => p.x + p.w)) - x, h: Math.max(...parts.map((p) => p.y + p.h)) - y };
+  }
+
+  destroy(): void {
+    for (const dispose of this.disposers) {
+      try {
+        dispose();
+      } catch (_e) {
+        /* already torn down */
+      }
+    }
+    this.disposers = [];
+  }
+}
diff --git a/webview/src/render/phaseoverview.ts b/webview/src/render/phaseoverview.ts
new file mode 100644
index 00000000..35a7ca16
--- /dev/null
+++ b/webview/src/render/phaseoverview.ts
@@ -0,0 +1,510 @@
+/**
+ * Viewer M3, roadmap step 13: the phase overview (Shift+0), as a PURE geometry.
+ *
+ * One block per phase, in the order the canvas draws its lanes: the phase's number and label, a
+ * line of counts, then its step titles in reading order (the Outline's and the review walk's
+ * order: a group before the steps it contains, depth first), each with its basis mark (◌ inferred,
+ * ? unresolved; an observed step has none) and the F labels of the findings on it. Neighbouring
+ * phases are joined by an arrow that says how many connections go from one to the next; a
+ * connection that skips a phase or goes back is drawn as a bracket on the right with its count
+ * (dashed when it goes back).
+ *
+ * Everything here is computed from the authored phases, steps, connections and findings (through
+ * `GraphIndex`) and the canvas size. Nothing is categorised for the author and nothing is called.
+ * It is drawn as an overlay over the canvas (`ui/overview.ts`), never inside the world layer, so
+ * the routed geometry and its golden do not move.
+ *
+ * COUNTS. Every step is listed or counted: a block that does not fit lists its first steps and
+ * ends with "… N more steps", so per block `listed + more = steps`, and the blocks sum to the
+ * document's step count. The connections are a partition too: inside a phase, from a phase to the
+ * next one (the arrows), and those that skip ahead or go back (the brackets) sum to the document's
+ * connection count. A finding touching two phases counts in each (the PR #14 rule, `laneCounts`),
+ * so the per-phase finding counts are labelled "touch this phase" and are not summed.
+ *
+ * FIT. Blocks are trimmed from the one with the most rows until the overview fits the canvas, but
+ * never below `MIN_SLOTS` title slots (two titles and the count). When even that does not
+ * fit, the overview scrolls (`height` is then larger than the canvas): beside the code at 541 px a
+ * six-phase document scrolls a little rather than showing phase names only.
+ */
+
+import { normalizeSeverity } from '../markers.js';
+import type { GraphIndex, IssuePredicate } from '../layout/model.js';
+import type { IssueCounts, Severity } from '../types.js';
+
+/* ── input ─────────────────────────────────────────────────────────────── */
+
+export interface OverviewTag {
+  /** The finding's F label (`Issue.short`). */
+  short: string;
+  /** The finding's real id, for the tooltip. */
+  id: string;
+  severity: Severity;
+}
+
+export interface OverviewStep {
+  id: string;
+  title: string;
+  /** `observed`, `inferred` or `unresolved` as authored ('' when absent). */
+  basis: string;
+  /** 0 for a lane root, 1 inside a group, and so on. */
+  depth: number;
+  /** The findings on this step that the severity toggles keep, in document order. */
+  tags: OverviewTag[];
+}
+
+export interface OverviewPhase {
+  id: string;
+  label: string;
+  /** The phase's position among the declared phases (0-based): its number and its colour. */
+  index: number;
+  steps: OverviewStep[];
+  /** Findings touching this phase, by severity (PR #14: a finding on two phases counts in both). */
+  findings: IssueCounts;
+  inferred: number;
+  unresolved: number;
+}
+
+export interface OverviewLink {
+  /** Positions in `OverviewInput.phases` (drawn order), never equal. */
+  from: number;
+  to: number;
+  count: number;
+}
+
+export interface OverviewInput {
+  phases: OverviewPhase[];
+  /** Connections between two different phases, one entry per ordered pair, in pair order. */
+  links: OverviewLink[];
+  /** Connections whose two ends are in the same phase. */
+  inside: number;
+  /** Connections with an end the document lacks (validation refuses them; kept so the sum holds). */
+  unplacedConnections: number;
+  /** Steps in no drawn phase (none today; kept so the sum holds). */
+  unplacedSteps: number;
+  totalSteps: number;
+  totalConnections: number;
+}
+
+/** The overview's data, from the index the canvas draws. `keep` is the severity toggles' filter. */
+export function overviewInput(index: GraphIndex, keep: IssuePredicate): OverviewInput {
+  const phases: OverviewPhase[] = [];
+  const position = new Map();
+  for (const lane of index.lanes) {
+    position.set(lane.id, phases.length);
+    phases.push({
+      id: lane.id,
+      label: lane.label || lane.id,
+      index: index.phaseIndexOf(lane.id),
+      steps: [],
+      findings: index.laneCounts(lane.id, keep),
+      inferred: 0,
+      unresolved: 0,
+    });
+  }
+  const seen = new Set();
+  let unplacedSteps = 0;
+  const add = (id: string, depth: number): void => {
+    if (seen.has(id)) return;
+    const node = index.nodeById.get(id);
+    if (!node) return;
+    seen.add(id);
+    const at = position.get(node.stage);
+    if (at === undefined) unplacedSteps++;
+    else {
+      const phase = phases[at];
+      const basis = node.basis || '';
+      if (basis === 'inferred') phase.inferred++;
+      else if (basis === 'unresolved') phase.unresolved++;
+      phase.steps.push({
+        id,
+        title: node.label || node.qualname || id,
+        basis,
+        depth,
+        tags: index.issuesOf(id, keep).map((issue) => ({ short: issue.short || issue.id, id: issue.id, severity: normalizeSeverity(issue.severity) })),
+      });
+    }
+    for (const child of index.laneChildren(id)) add(child, depth + 1);
+  };
+  for (const lane of index.lanes) for (const root of index.roots(lane.id)) add(root, 0);
+  // A step the drawn hierarchy did not reach (none can, today) is still listed in its phase.
+  for (const node of index.graph.nodes || []) add(node.id, 0);
+
+  const pairs = new Map();
+  let inside = 0;
+  let unplacedConnections = 0;
+  for (const edge of index.graph.edges || []) {
+    const source = index.nodeById.get(edge.source);
+    const target = index.nodeById.get(edge.target);
+    const a = source ? position.get(source.stage) : undefined;
+    const b = target ? position.get(target.stage) : undefined;
+    if (a === undefined || b === undefined) unplacedConnections++;
+    else if (a === b) inside++;
+    else {
+      const key = a + '>' + b;
+      const link = pairs.get(key);
+      if (link) link.count++;
+      else pairs.set(key, { from: a, to: b, count: 1 });
+    }
+  }
+  const links = Array.from(pairs.values()).sort((p, q) => p.from - q.from || p.to - q.to);
+  return {
+    phases,
+    links,
+    inside,
+    unplacedConnections,
+    unplacedSteps,
+    totalSteps: (index.graph.nodes || []).length,
+    totalConnections: (index.graph.edges || []).length,
+  };
+}
+
+/* ── wording ───────────────────────────────────────────────────────────── */
+
+const plural = (n: number, one: string, many: string): string => n + ' ' + (n === 1 ? one : many);
+
+/** Whether a link is drawn as an arrow (to the next phase) rather than a bracket. */
+export function isNextLink(link: OverviewLink): boolean {
+  return link.to === link.from + 1;
+}
+
+/** The connection partition: inside, to the next phase, skipping ahead or going back. */
+export function connectionPartition(input: OverviewInput): { inside: number; next: number; jumps: number; unplaced: number } {
+  let next = 0;
+  let jumps = 0;
+  for (const link of input.links) {
+    if (isNextLink(link)) next += link.count;
+    else jumps += link.count;
+  }
+  return { inside: input.inside, next, jumps, unplaced: input.unplacedConnections };
+}
+
+/**
+ * The header's count sentence, every count with its unit, the connections as a partition that
+ * sums to the total: "6 phases · 31 steps · 41 connections: 19 inside a phase, 8 to the next
+ * phase, 14 skip ahead or go back."
+ */
+export function overviewSummary(input: OverviewInput): string {
+  const part = connectionPartition(input);
+  const pieces = [plural(part.inside, 'inside a phase', 'inside a phase'), plural(part.next, 'to the next phase', 'to the next phase'),
+    plural(part.jumps, 'skips ahead or goes back', 'skip ahead or go back')];
+  if (part.unplaced) pieces.push(plural(part.unplaced, 'with an end the document lacks', 'with an end the document lacks'));
+  return plural(input.phases.length, 'phase', 'phases') + ' · ' + plural(input.totalSteps, 'step', 'steps') + ' · ' +
+    plural(input.totalConnections, 'connection', 'connections') + ': ' + pieces.join(', ') + '.';
+}
+
+/** What the arrows, brackets and marks mean; shown under the counts when there is room. */
+export const OVERVIEW_KEY = 'Arrows join a phase to the next; brackets on the right skip ahead (solid) or go back (dashed). ◌ inferred, ? unresolved.';
+
+/** "9 steps (1 inferred, 3 unresolved)": the block's step count with its exceptions. */
+export function blockStepsText(phase: OverviewPhase): string {
+  const extra: string[] = [];
+  if (phase.inferred) extra.push(phase.inferred + ' inferred');
+  if (phase.unresolved) extra.push(phase.unresolved + ' unresolved');
+  return plural(phase.steps.length, 'step', 'steps') + (extra.length ? ' (' + extra.join(', ') + ')' : '');
+}
+
+/* ── geometry ──────────────────────────────────────────────────────────── */
+
+/** Outer padding (CSS px); `PAD_NARROW` below `NARROW_W`. */
+export const PAD = 16;
+export const PAD_NARROW = 12;
+/** Below this canvas width the overview is one column of blocks with one column of titles. */
+export const NARROW_W = 620;
+/** A block this wide or wider lists its titles in two columns and has a one-line head. */
+export const TWO_COLUMNS_MIN_W = 600;
+/** The widest a block is drawn (wider canvases leave room on the right). */
+export const BLOCK_MAX_W = 980;
+/** The head: number, label and counts on one line, or the counts on a second line. */
+export const HEAD_H = 32;
+export const HEAD_H_TWO_LINES = 50;
+/** One title row (12.5 px text on an 18 px line). */
+export const ROW_H = 18;
+export const BLOCK_PAD_B = 8;
+/** Inner padding left and right of the title columns, and the gap between the columns. */
+export const BLOCK_PAD_X = 12;
+export const COLUMN_GAP = 16;
+/** Indentation per group level, at most two levels. */
+export const INDENT = 12;
+/** The vertical gap between two blocks, where the "N connections" arrow goes. */
+export const GAP = 26;
+/** Brackets: the first slot's distance from the blocks, then one slot every SLOT_STEP. */
+export const BRACKET_INSET = 12;
+export const SLOT_STEP = 12;
+export const SLOT_STEP_MIN = 7;
+/** Room after the last slot for its count. */
+export const BRACKET_TAIL = 14;
+/**
+ * A block never shows fewer title slots than this (unless it has fewer steps): two titles and the
+ * "… N more steps" row, in as many rows as its columns need. Below that, the overview scrolls.
+ */
+export const MIN_SLOTS = 3;
+/** The header: a title row, then the summary lines. */
+export const HEADER_TITLE_H = 24;
+export const HEADER_LINE_H = 17;
+export const HEADER_PAD = 8;
+/** The space between the header and the first block. */
+export const HEADER_GAP = 12;
+/**
+ * A conservative average character width of the 12 px summary text, so the estimated line count
+ * is never short (a line too many only leaves a gap; one too few would hide the counts).
+ */
+export const SUMMARY_CHAR_W = 6.8;
+
+export interface Rect {
+  x: number;
+  y: number;
+  w: number;
+  h: number;
+}
+
+export interface OverviewItem {
+  /** A step's position in its phase's `steps`, or -1 for the "… N more steps" row. */
+  step: number;
+  /** For the "more" row: how many steps it stands for. */
+  more: number;
+  col: number;
+  row: number;
+  x: number;
+  y: number;
+  w: number;
+  /** Group depth, clamped to 2 (the item's x already includes the indentation). */
+  depth: number;
+}
+
+export interface OverviewBlock {
+  /** Position in `OverviewInput.phases`. */
+  phase: number;
+  x: number;
+  y: number;
+  w: number;
+  h: number;
+  headH: number;
+  twoLineHead: boolean;
+  cols: number;
+  rows: number;
+  /** Rows the block would need to list every step. */
+  rowsNeeded: number;
+  items: OverviewItem[];
+  /** Steps listed by title. */
+  listed: number;
+  /** Steps counted in the "… N more steps" row (0 when every step is listed). */
+  more: number;
+}
+
+export interface OverviewArrow {
+  from: number;
+  to: number;
+  count: number;
+  x: number;
+  y1: number;
+  y2: number;
+  labelX: number;
+  labelY: number;
+}
+
+export interface OverviewBracket {
+  from: number;
+  to: number;
+  count: number;
+  /** It goes back (to an earlier phase): dashed. */
+  back: boolean;
+  slot: number;
+  /** The blocks' right edge, where the bracket leaves and enters. */
+  x0: number;
+  /** The slot's vertical line. */
+  x: number;
+  y1: number;
+  y2: number;
+  labelX: number;
+  labelY: number;
+}
+
+export interface OverviewLayout {
+  /** The canvas size the layout is for. */
+  viewW: number;
+  viewH: number;
+  /** The content size; `height > viewH` means the overview scrolls. */
+  width: number;
+  height: number;
+  scrolls: boolean;
+  /** One column of blocks with one column of titles (below NARROW_W). */
+  narrow: boolean;
+  header: Rect & { lines: number; summary: string; key: string | null };
+  blocks: OverviewBlock[];
+  arrows: OverviewArrow[];
+  brackets: OverviewBracket[];
+  /** Some block lists fewer titles than it has steps. */
+  trimmed: boolean;
+}
+
+/**
+ * The overview for a canvas `w` x `h` (CSS px). Pure: the same input and size always give the same
+ * picture, so tests pin it at fixed sizes without a DOM.
+ */
+export function phaseOverviewLayout(input: OverviewInput, w: number, h: number): OverviewLayout {
+  const viewW = Math.max(1, Math.floor(w));
+  const viewH = Math.max(1, Math.floor(h));
+  const narrow = viewW < NARROW_W;
+  const pad = narrow ? PAD_NARROW : PAD;
+  const n = input.phases.length;
+
+  // Brackets: every link that is not to the next phase, packed into as few slots as possible
+  // (two brackets share a slot when the phases they span do not overlap).
+  const jumps = input.links.filter((link) => !isNextLink(link));
+  const order = jumps
+    .map((link, i) => ({ link, i }))
+    .sort((p, q) => span(p.link) - span(q.link) || Math.min(p.link.from, p.link.to) - Math.min(q.link.from, q.link.to) || p.i - q.i);
+  const slotOf = new Map();
+  const slots: Array> = [];
+  for (const { link } of order) {
+    const lo = Math.min(link.from, link.to);
+    const hi = Math.max(link.from, link.to);
+    let s = 0;
+    while (s < slots.length && slots[s].some(([a, b]) => lo <= b && a <= hi)) s++;
+    if (s === slots.length) slots.push([]);
+    slots[s].push([lo, hi]);
+    slotOf.set(link, s);
+  }
+  const slotCount = slots.length;
+  const gutterMax = Math.max(60, Math.min(160, Math.round(viewW * 0.2)));
+  let step = SLOT_STEP;
+  if (slotCount && BRACKET_INSET + slotCount * step + BRACKET_TAIL > gutterMax) {
+    step = Math.max(SLOT_STEP_MIN, (gutterMax - BRACKET_INSET - BRACKET_TAIL) / slotCount);
+  }
+  const gutter = slotCount ? Math.ceil(BRACKET_INSET + (slotCount - 1) * step + BRACKET_TAIL) : 0;
+
+  const blockW = Math.max(120, Math.min(BLOCK_MAX_W, viewW - 2 * pad - gutter));
+  const twoColumns = !narrow && blockW >= TWO_COLUMNS_MIN_W;
+  const cols = twoColumns ? 2 : 1;
+  const twoLineHead = !twoColumns;
+  const headH = twoLineHead ? HEAD_H_TWO_LINES : HEAD_H;
+
+  // The header: a title row, then the counts (and, with room, the key), at an estimated line count.
+  const summary = overviewSummary(input);
+  const key = narrow ? null : OVERVIEW_KEY;
+  const textW = Math.max(80, viewW - 2 * pad);
+  const linesFor = (text: string) => Math.max(1, Math.ceil((text.length * SUMMARY_CHAR_W) / textW));
+  const lines = linesFor(summary) + (key ? linesFor(key) : 0);
+  const header = { x: pad, y: pad, w: viewW - 2 * pad, h: HEADER_TITLE_H + lines * HEADER_LINE_H + HEADER_PAD, lines, summary, key };
+
+  // Rows per block, then trim the block with the most rows until the whole thing fits.
+  const rowsNeeded = input.phases.map((phase) => Math.ceil(phase.steps.length / cols));
+  const rows = rowsNeeded.slice();
+  const minRows = input.phases.map((phase) => Math.ceil(Math.min(phase.steps.length, MIN_SLOTS) / cols));
+  const blockH = (r: number) => headH + (r > 0 ? r * ROW_H : 0) + BLOCK_PAD_B;
+  const contentH = () => header.y + header.h + HEADER_GAP + rows.reduce((sum, r) => sum + blockH(r), 0) + GAP * Math.max(0, n - 1) + pad;
+  while (contentH() > viewH) {
+    let pick = -1;
+    for (let i = 0; i < n; i++) {
+      if (rows[i] <= minRows[i]) continue;
+      if (pick < 0 || rows[i] > rows[pick] || (rows[i] === rows[pick] && input.phases[i].steps.length >= input.phases[pick].steps.length)) pick = i;
+    }
+    if (pick < 0) break;
+    rows[pick]--;
+  }
+
+  const blocks: OverviewBlock[] = [];
+  let y = header.y + header.h + HEADER_GAP;
+  const colW = (blockW - 2 * BLOCK_PAD_X - (cols - 1) * COLUMN_GAP) / cols;
+  input.phases.forEach((phase, i) => {
+    const r = rows[i];
+    const slotsAvailable = r * cols;
+    const total = phase.steps.length;
+    const fits = slotsAvailable >= total;
+    const listed = fits ? total : Math.max(0, slotsAvailable - 1);
+    const more = total - listed;
+    const items: OverviewItem[] = [];
+    // Column-major, so reading order runs down the first column and on into the second.
+    for (let k = 0; k < listed + (more ? 1 : 0); k++) {
+      const col = Math.floor(k / Math.max(1, r));
+      const row = k % Math.max(1, r);
+      const isMore = k === listed;
+      const depth = isMore ? 0 : Math.min(2, phase.steps[k].depth);
+      const x0 = pad + BLOCK_PAD_X + col * (colW + COLUMN_GAP);
+      items.push({
+        step: isMore ? -1 : k,
+        more: isMore ? more : 0,
+        col,
+        row,
+        x: round1(x0 + depth * INDENT),
+        y: round1(y + headH + row * ROW_H),
+        w: round1(colW - depth * INDENT),
+        depth,
+      });
+    }
+    const height = blockH(r);
+    blocks.push({ phase: i, x: pad, y: round1(y), w: round1(blockW), h: height, headH, twoLineHead, cols, rows: r, rowsNeeded: rowsNeeded[i], items, listed, more });
+    y += height + GAP;
+  });
+
+  // Arrows between neighbours, in the gap under each block, at its left.
+  const arrows: OverviewArrow[] = [];
+  for (const link of input.links) {
+    if (!isNextLink(link)) continue;
+    const a = blocks[link.from];
+    const b = blocks[link.to];
+    if (!a || !b) continue;
+    const x = a.x + 22;
+    const y1 = a.y + a.h + 3;
+    const y2 = b.y - 3;
+    arrows.push({ from: link.from, to: link.to, count: link.count, x, y1: round1(y1), y2: round1(y2), labelX: x + 10, labelY: round1((y1 + y2) / 2) });
+  }
+
+  // Brackets: each block spreads its ends along its right edge, the ends to earlier phases on top.
+  const x0 = pad + blockW;
+  const ends = new Map>();
+  for (const link of jumps) {
+    pushEnd(ends, link.from, { link, other: link.to });
+    pushEnd(ends, link.to, { link, other: link.from });
+  }
+  const endY = new Map();
+  for (const [at, list] of ends) {
+    const block = blocks[at];
+    if (!block) continue;
+    list.sort((p, q) => p.other - q.other || (slotOf.get(p.link) || 0) - (slotOf.get(q.link) || 0));
+    const top = block.y + 10;
+    const usable = Math.max(1, block.h - 20);
+    list.forEach((end, j) => endY.set(endKey(end.link, at), round1(top + ((j + 1) * usable) / (list.length + 1))));
+  }
+  const brackets: OverviewBracket[] = jumps.map((link) => {
+    const slot = slotOf.get(link) || 0;
+    const x = round1(x0 + BRACKET_INSET + slot * step);
+    const y1 = endY.get(endKey(link, link.from)) || 0;
+    const y2 = endY.get(endKey(link, link.to)) || 0;
+    return { from: link.from, to: link.to, count: link.count, back: link.to < link.from, slot, x0: round1(x0), x, y1, y2, labelX: x, labelY: round1((y1 + y2) / 2) };
+  });
+
+  const height = Math.ceil(y - GAP + pad);
+  const width = Math.ceil(Math.min(viewW, x0 + gutter + pad));
+  return {
+    viewW,
+    viewH,
+    width: Math.max(width, viewW),
+    height,
+    scrolls: height > viewH,
+    narrow,
+    header,
+    blocks,
+    arrows,
+    brackets,
+    trimmed: blocks.some((b) => b.more > 0),
+  };
+}
+
+function span(link: OverviewLink): number {
+  return Math.abs(link.to - link.from);
+}
+
+function endKey(link: OverviewLink, at: number): string {
+  return link.from + '>' + link.to + '@' + at;
+}
+
+function pushEnd(map: Map, key: number, value: V): void {
+  const list = map.get(key);
+  if (list) list.push(value);
+  else map.set(key, [value]);
+}
+
+function round1(v: number): number {
+  return Math.round(v * 10) / 10;
+}
diff --git a/webview/src/render/scene.ts b/webview/src/render/scene.ts
index cdddb35c..66dcc425 100644
--- a/webview/src/render/scene.ts
+++ b/webview/src/render/scene.ts
@@ -11,13 +11,10 @@
  */
 
 import { clear } from '../dom.js';
-import { highestSeverity } from '../markers.js';
 import { buildBundle } from './bundles.js';
 import { buildEdge } from './edges.js';
 import { buildGroupBox, buildLane, buildNodeCard } from './nodes.js';
 import { planScene, ScenePlan, ScenePlanOptions } from './plan.js';
-import type { GraphIndex, IssuePredicate } from '../layout/model.js';
-import type { LayoutFrame } from '../layout/layout.js';
 import type { RoutedEdge } from '../layout/routing.js';
 
 export interface SceneLayers {
@@ -92,22 +89,3 @@ export function renderScene(layers: SceneLayers, opts: SceneOptions): SceneResul
 
   return { nodeEls, edgeEls, bundleEls, plan };
 }
-
-/** Minimap dots: one per drawn box, coloured by stage and ringed by severity. */
-export function minimapDots(index: GraphIndex, frame: LayoutFrame, keep: IssuePredicate) {
-  const dots = [];
-  for (const box of frame.boxes.values()) {
-    const node = index.nodeById.get(box.id);
-    if (!node) continue;
-    dots.push({
-      x: box.x,
-      y: box.y,
-      w: box.w,
-      h: box.h,
-      stage: node.stage,
-      phase: index.phaseIndexOf(node.stage),
-      severity: highestSeverity(index.subtreeCounts(box.id, keep)),
-    });
-  }
-  return dots;
-}
diff --git a/webview/src/styles/chrome.css b/webview/src/styles/chrome.css
index cf0e8a84..6b40dfa4 100644
--- a/webview/src/styles/chrome.css
+++ b/webview/src/styles/chrome.css
@@ -1,5 +1,6 @@
 /*
- * The header row, the ... menu, the search box and the status bar (viewer M2), then the minimap.
+ * The header row, the ... menu, the search box and the status bar (viewer M2). The phase index
+ * that replaced the minimap is in overview.css (viewer M3).
  *
  * The first of three `chrome*.css` layers: the toasts and the empty states
  * are in `chromestates.css`, the sheet and legend in `chromepanels.css`.
@@ -456,23 +457,23 @@
   font-size: var(--mlv-fs-11);
 }
 
-/* Viewer M2 live fix: the overview map's item says why the map is not drawn, on a second line in
+/* Viewer M2 live fix: the overview map's item said why the map was not drawn, on a second line in
  * the description colour, so the disabled item keeps readable text (no fade) and its check mark
- * stays on the first line. */
-.mlv-moremenu__item[data-more-item="minimap"] {
+ * stays on the first line. Viewer M3: the phase index's item, which replaced it, does the same. */
+.mlv-moremenu__item[data-more-item="phaseindex"] {
   flex-wrap: wrap;
   row-gap: 0;
 }
 
-.mlv-moremenu__item[data-more-item="minimap"]::after {
+.mlv-moremenu__item[data-more-item="phaseindex"]::after {
   order: 2;
 }
 
-.mlv-moremenu__item[data-more-item="minimap"][disabled] {
+.mlv-moremenu__item[data-more-item="phaseindex"][disabled] {
   opacity: 1;
 }
 
-.mlv-moremenu__item[data-more-item="minimap"][disabled] .mlv-moremenu__label,
+.mlv-moremenu__item[data-more-item="phaseindex"][disabled] .mlv-moremenu__label,
 .mlv-moremenu__note {
   color: var(--mlv-text-2);
 }
@@ -601,76 +602,3 @@
   display: none;
 }
 
-/* minimap */
-.mlv-minimap {
-  position: absolute;
-  right: var(--mlv-s5);
-  bottom: var(--mlv-s5);
-  z-index: 20;
-  width: 200px;
-  border: 1px solid var(--mlv-border-strong);
-  border-radius: var(--mlv-r-btn);
-  background: var(--mlv-surface);
-  box-shadow: var(--mlv-sh-2);
-  overflow: hidden;
-}
-
-.mlv-minimap[hidden] {
-  display: none;
-}
-
-/* collapsed: a 28 px chevron tab instead of 200x130 of occluded diagram. */
-.mlv-minimap.is-collapsed {
-  width: 28px;
-  height: 28px;
-}
-
-.mlv-minimap.is-collapsed .mlv-minimap__svg {
-  display: none;
-}
-
-.mlv-minimap__toggle {
-  position: absolute;
-  top: 2px;
-  right: 2px;
-  z-index: 1;
-  width: 24px;
-  height: 24px;
-  min-height: 0;
-  padding: 0;
-  border-radius: var(--mlv-r-btn);
-  background: var(--mlv-surface);
-  color: var(--mlv-text-2);
-}
-
-.mlv-minimap__toggle .mlv-uicon {
-  transform: rotate(-90deg);
-}
-
-.mlv-minimap.is-collapsed .mlv-minimap__toggle .mlv-uicon {
-  transform: rotate(90deg);
-}
-
-.mlv-minimap__svg {
-  display: block;
-  width: 100%;
-  height: 130px;
-  cursor: pointer;
-}
-
-.mlv-minimap__node {
-  fill: var(--mlv-stage, var(--mlv-stage-unknown));
-  opacity: 0.75;
-}
-
-.mlv-minimap__node--issue {
-  stroke: var(--mlv-sev, var(--mlv-sev-low));
-  stroke-width: 1.5;
-}
-
-.mlv-minimap__view {
-  fill: var(--mlv-accent);
-  fill-opacity: 0.12;
-  stroke: var(--mlv-accent);
-  stroke-width: 1;
-}
diff --git a/webview/src/styles/export.css b/webview/src/styles/export.css
index 4f915523..8e498794 100644
--- a/webview/src/styles/export.css
+++ b/webview/src/styles/export.css
@@ -3,7 +3,7 @@
  *
  * `grep '@media print' webview/src` found
  * nothing before this file, so Ctrl+P gave the current VIEWPORT at the current
- * ZOOM with the fixed toolbar, rail, minimap and zoom cluster painted over it —
+ * ZOOM with the fixed toolbar, rail, minimap (since viewer M3 the phase index) and zoom cluster painted over it —
  * a page of chrome and a corner of diagram. Here the chrome is removed, the
  * page-fill chain that clips the canvas is released, and the canvas transform
  * is dropped so the world prints at the natural size the layout already gave it
@@ -26,7 +26,8 @@
   .mlv-walkbar,
   .mlv-status,
   .mlv-rail,
-  .mlv-minimap,
+  .mlv-phaseindex,
+  .mlv-overview,
   .mlv-zoom,
   .mlv-skiplink,
   .mlv-legend,
diff --git a/webview/src/styles/overview.css b/webview/src/styles/overview.css
new file mode 100644
index 00000000..a0502b28
--- /dev/null
+++ b/webview/src/styles/overview.css
@@ -0,0 +1,566 @@
+/*
+ * Viewer M3, roadmap step 13: the phase index (it replaced the minimap) and the phase overview.
+ *
+ * Both are overlays inside the canvas and outside the world layer, so neither moves the routed
+ * picture. Sizes here are the ones `render/phaseindex.ts` (INDEX_W, INDEX_HEAD_H, INDEX_ROW_H,
+ * PILL_H, INDEX_MARGIN) and `render/phaseoverview.ts` (HEAD_H, ROW_H, …) compute with; change them
+ * together. Colours are tokens only: the phase tone (`--mlv-stage`, bound from `data-phase-tone`
+ * in node.css) on the number and the block's left rule, severity on the glyphs, the accent on
+ * what is in view. No motion here: the move to a phase is the viewport's (240 ms, none under
+ * reduced motion).
+ */
+
+/* ── the phase index ───────────────────────────────────────────────────── */
+
+.mlv-phaseindex {
+  position: absolute;
+  right: 12px;
+  bottom: 12px;
+  z-index: 20;
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 4px;
+  max-width: calc(100% - 24px);
+  max-height: calc(100% - 24px);
+  pointer-events: none;
+}
+
+.mlv-phaseindex[hidden] {
+  display: none;
+}
+
+.mlv-phaseindex__panel,
+.mlv-phaseindex__pill {
+  pointer-events: auto;
+}
+
+.mlv-phaseindex__panel {
+  display: flex;
+  flex-direction: column;
+  width: 288px;
+  max-width: 100%;
+  min-height: 0;
+  padding: 4px 0;
+  border: 1px solid var(--mlv-border-strong);
+  border-radius: var(--mlv-r-btn);
+  background: var(--mlv-surface);
+  box-shadow: var(--mlv-sh-2);
+  overflow: hidden;
+}
+
+.mlv-phaseindex__panel[hidden] {
+  display: none;
+}
+
+.mlv-phaseindex__head {
+  display: flex;
+  align-items: center;
+  gap: var(--mlv-s3);
+  flex: none;
+  height: 26px;
+  padding: 0 4px 0 10px;
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-11);
+}
+
+.mlv-phaseindex__title {
+  color: var(--mlv-text);
+  font-weight: var(--mlv-fw-semi);
+}
+
+.mlv-phaseindex__total {
+  flex: 1 1 auto;
+  font-variant-numeric: tabular-nums;
+}
+
+.mlv-phaseindex__fold {
+  flex: none;
+  width: 22px;
+  height: 22px;
+  min-height: 0;
+  padding: 0;
+  color: var(--mlv-text-2);
+}
+
+/* The chevron points down: fold the panel to its line. */
+.mlv-phaseindex__fold .mlv-uicon {
+  transform: rotate(90deg);
+}
+
+.mlv-phaseindex__rows {
+  flex: 1 1 auto;
+  min-height: 0;
+  margin: 0;
+  padding: 0;
+  overflow-y: auto;
+  list-style: none;
+}
+
+.mlv-phaseindex__row {
+  display: flex;
+  align-items: center;
+  gap: var(--mlv-s3);
+  width: 100%;
+  height: 24px;
+  padding: 0 10px 0 7px;
+  border: 0;
+  border-left: 3px solid transparent;
+  background: none;
+  color: var(--mlv-text);
+  font: inherit;
+  font-size: var(--mlv-fs-12);
+  text-align: left;
+  cursor: pointer;
+}
+
+.mlv-phaseindex__row:hover {
+  background: var(--mlv-surface-2);
+}
+
+.mlv-phaseindex__row:focus-visible {
+  outline: 1px solid var(--mlv-focus);
+  outline-offset: -1px;
+}
+
+/* In view: an accent rule and a faint accent wash, never colour alone (the name says "in view"). */
+.mlv-phaseindex__row[data-in-view="true"] {
+  border-left-color: var(--mlv-accent);
+  background: color-mix(in srgb, var(--mlv-accent) 12%, transparent);
+}
+
+.mlv-phaseindex__num,
+.mlv-phaseindex__pillnum {
+  flex: none;
+  color: var(--mlv-text-2);
+  font-weight: var(--mlv-fw-semi);
+  font-variant-numeric: tabular-nums;
+}
+
+.mlv-phaseindex__num {
+  min-width: 14px;
+}
+
+/* The phase's colour, as the lane's swatch: a small square before the number. */
+.mlv-phaseindex__row::before {
+  content: "";
+  flex: none;
+  width: 8px;
+  height: 8px;
+  border-radius: 2px;
+  background: var(--mlv-stage, var(--mlv-stage-unknown));
+}
+
+.mlv-phaseindex__label {
+  flex: 1 1 auto;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.mlv-phaseindex__sev {
+  flex: none;
+}
+
+.mlv-phaseindex__steps {
+  flex: none;
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-11);
+  font-variant-numeric: tabular-nums;
+}
+
+/* The pill: the phase most in view, "4/6 Objective, optimizer & scheduler ▴". */
+.mlv-phaseindex__pill {
+  display: flex;
+  align-items: center;
+  gap: var(--mlv-s3);
+  max-width: min(360px, 100%);
+  height: 28px;
+  padding: 0 8px 0 10px;
+  border: 1px solid var(--mlv-border-strong);
+  border-radius: 14px;
+  background: var(--mlv-surface);
+  box-shadow: var(--mlv-sh-2);
+  color: var(--mlv-text);
+  font: inherit;
+  font-size: var(--mlv-fs-12);
+  cursor: pointer;
+}
+
+.mlv-phaseindex__pill[hidden] {
+  display: none;
+}
+
+.mlv-phaseindex__pill:hover {
+  background: var(--mlv-surface-2);
+}
+
+.mlv-phaseindex__pill:focus-visible {
+  outline: 1px solid var(--mlv-focus);
+  outline-offset: 1px;
+}
+
+.mlv-phaseindex__pilllabel {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* ▴: the rows open above the pill (or unfold the panel). */
+.mlv-phaseindex__pillchev {
+  flex: none;
+  color: var(--mlv-text-2);
+  transform: rotate(-90deg);
+}
+
+.mlv-phaseindex[data-open="true"] .mlv-phaseindex__pillchev {
+  transform: rotate(90deg);
+}
+
+/* The pill's open rows sit above it, inside the canvas (so above the bottom sheet). */
+.mlv-phaseindex[data-form="pill"] .mlv-phaseindex__panel {
+  max-height: calc(100% - 32px);
+}
+
+.mlv-phaseindex[data-form="pill"] .mlv-phaseindex__fold {
+  display: none;
+}
+
+/* ── the phase overview ────────────────────────────────────────────────── */
+
+.mlv-overview {
+  position: absolute;
+  inset: 0;
+  z-index: 35;
+  overflow: auto;
+  overscroll-behavior: contain;
+  touch-action: pan-x pan-y;
+  background: var(--mlv-bg);
+  cursor: default;
+}
+
+.mlv-overview[hidden] {
+  display: none;
+}
+
+.mlv-overview__content {
+  position: relative;
+}
+
+.mlv-overview__header {
+  position: absolute;
+  box-sizing: border-box;
+}
+
+.mlv-overview__top {
+  display: flex;
+  align-items: center;
+  gap: var(--mlv-s4);
+  height: 24px;
+}
+
+.mlv-overview__title {
+  flex: 1 1 auto;
+  min-width: 0;
+  margin: 0;
+  overflow: hidden;
+  color: var(--mlv-text);
+  font-size: var(--mlv-fs-13);
+  font-weight: var(--mlv-fw-semi);
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.mlv-overview__back {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--mlv-s2);
+  flex: none;
+  height: 22px;
+  min-height: 0;
+  padding: 0 6px;
+  color: var(--mlv-text);
+  font-size: var(--mlv-fs-12);
+}
+
+.mlv-overview__kbd {
+  padding: 0 4px;
+  border: 1px solid var(--mlv-border-strong);
+  border-radius: 3px;
+  color: var(--mlv-text-2);
+  font-family: inherit;
+  font-size: var(--mlv-fs-10);
+}
+
+.mlv-overview__summary,
+.mlv-overview__key {
+  margin: 0;
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-12);
+  line-height: 17px;
+}
+
+.mlv-overview__summary {
+  color: var(--mlv-text);
+}
+
+.mlv-overview__links {
+  position: absolute;
+  top: 0;
+  left: 0;
+  overflow: visible;
+  pointer-events: none;
+}
+
+.mlv-overview__arrow,
+.mlv-overview__bracket {
+  fill: none;
+  stroke: var(--mlv-edge, var(--mlv-text-2));
+  stroke-width: 1.5;
+}
+
+.mlv-overview__arrow {
+  stroke-width: 2;
+}
+
+.mlv-overview__bracket[data-back="true"] {
+  stroke-dasharray: 5 3;
+}
+
+.mlv-overview__head {
+  fill: var(--mlv-edge, var(--mlv-text-2));
+}
+
+.mlv-overview__arrowlabel {
+  position: absolute;
+  transform: translateY(-50%);
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-12);
+  white-space: nowrap;
+  pointer-events: none;
+}
+
+/* A bracket's count, on a plate so it reads over the lines beside it. */
+.mlv-overview__count {
+  position: absolute;
+  min-width: 14px;
+  padding: 0 3px;
+  border: 1px solid var(--mlv-border-strong);
+  border-radius: 7px;
+  background: var(--mlv-bg);
+  color: var(--mlv-text);
+  font-size: var(--mlv-fs-10);
+  line-height: 13px;
+  text-align: center;
+  font-variant-numeric: tabular-nums;
+  transform: translate(-50%, -50%);
+}
+
+.mlv-overview__count[data-back="true"] {
+  border-style: dashed;
+}
+
+.mlv-overview__blocks,
+.mlv-overview__item {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.mlv-ovblock {
+  position: absolute;
+  box-sizing: border-box;
+  overflow: hidden;
+  border: 1px solid color-mix(in srgb, var(--mlv-stage, var(--mlv-text-2)) 45%, var(--mlv-border-strong));
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--mlv-stage, var(--mlv-text-2)) 7%, var(--mlv-surface));
+  cursor: pointer;
+}
+
+/* The phase's colour as the lane's left rule. */
+.mlv-ovblock::before {
+  content: "";
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  width: 4px;
+  background: var(--mlv-stage, var(--mlv-stage-unknown));
+}
+
+.mlv-ovblock:hover {
+  border-color: var(--mlv-stage, var(--mlv-border-strong));
+}
+
+.mlv-ovblock:focus-visible,
+.mlv-ovblock:focus {
+  outline: 2px solid var(--mlv-focus);
+  outline-offset: 1px;
+}
+
+.mlv-ovblock__head {
+  display: flex;
+  align-items: center;
+  gap: var(--mlv-s5);
+  box-sizing: border-box;
+  padding: 0 12px 0 16px;
+}
+
+.mlv-ovblock[data-head="two-lines"] .mlv-ovblock__head {
+  flex-direction: column;
+  align-items: stretch;
+  justify-content: center;
+  gap: 2px;
+}
+
+.mlv-ovblock[data-head="two-lines"] .mlv-ovblock__name {
+  flex: none;
+}
+
+.mlv-ovblock__name {
+  display: flex;
+  align-items: baseline;
+  gap: var(--mlv-s3);
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
+.mlv-ovblock__num {
+  flex: none;
+  color: var(--mlv-text-2);
+  font-size: 15px;
+  font-weight: var(--mlv-fw-semi);
+  font-variant-numeric: tabular-nums;
+}
+
+.mlv-ovblock__label {
+  min-width: 0;
+  overflow: hidden;
+  color: var(--mlv-text);
+  font-size: 15px;
+  font-weight: var(--mlv-fw-semi);
+  line-height: 20px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.mlv-ovblock__meta {
+  display: flex;
+  align-items: center;
+  gap: var(--mlv-s3);
+  flex: 0 1 auto;
+  min-width: 0;
+  overflow: hidden;
+  color: var(--mlv-text-2);
+  font-size: var(--mlv-fs-12);
+  line-height: 18px;
+  white-space: nowrap;
+}
+
+.mlv-ovblock__steps {
+  flex: none;
+}
+
+.mlv-ovblock__meta .mlv-cluster {
+  flex: none;
+}
+
+.mlv-ovblock__unit {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.mlv-ovblock__unit::before {
+  content: "· ";
+}
+
+.mlv-ovblock__list {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.mlv-ovitem {
+  position: absolute;
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  box-sizing: border-box;
+  height: 18px;
+  color: var(--mlv-text);
+  font-size: 12.5px;
+  line-height: 18px;
+  white-space: nowrap;
+}
+
+/* The basis mark: nothing for observed (the calm canvas rule), ◌ inferred, ? unresolved. */
+.mlv-ovitem__mark {
+  flex: none;
+  width: 14px;
+  color: var(--mlv-text-2);
+  text-align: center;
+}
+
+.mlv-ovitem[data-basis] .mlv-ovitem__mark {
+  color: var(--mlv-text);
+  font-weight: var(--mlv-fw-semi);
+}
+
+/* ◌ drawn as a dotted ring: macOS system fonts show nothing for the character. */
+.mlv-ovmark {
+  display: inline-block;
+  box-sizing: border-box;
+  width: 9px;
+  height: 9px;
+  border: 1.5px dotted currentColor;
+  border-radius: 50%;
+  vertical-align: -1px;
+}
+
+.mlv-overview__key .mlv-ovmark {
+  margin-right: 3px;
+}
+
+.mlv-ovitem__title {
+  flex: 0 1 auto;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.mlv-ovitem__tags {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--mlv-s2);
+  flex: none;
+  margin-left: var(--mlv-s3);
+}
+
+.mlv-ovitem__tag {
+  display: inline-flex;
+  align-items: center;
+  gap: 1px;
+  font-size: var(--mlv-fs-11);
+  font-weight: var(--mlv-fw-semi);
+  font-variant-numeric: tabular-nums;
+}
+
+.mlv-ovitem--more {
+  padding-left: 16px;
+  color: var(--mlv-text-2);
+}
+
+/* High contrast: no tints; the contrast border carries the shapes. */
+.mlv-root[data-theme="hc"] .mlv-ovblock {
+  border-color: var(--vscode-contrastBorder, var(--mlv-border-strong));
+  background: var(--mlv-surface);
+}
+
+.mlv-root[data-theme="hc"] .mlv-phaseindex__row[data-in-view="true"] {
+  background: none;
+  outline: 1px dashed var(--mlv-accent);
+  outline-offset: -2px;
+}
diff --git a/webview/src/styles/workflow.css b/webview/src/styles/workflow.css
index 852dd460..6a4e7a27 100644
--- a/webview/src/styles/workflow.css
+++ b/webview/src/styles/workflow.css
@@ -156,14 +156,6 @@
   min-height: min(320px, 50vh);
 }
 
-/* Issue 6: a canvas too short for the minimap to summarise anything (canvasview.ts). Viewer M2
- * live fix: a panel 900 px wide or narrower has no room for it beside the diagram either; the App
- * sets `.is-narrow` from the panel's width (it was an @media rule), so the ... menu says why. */
-.mlv-minimap.is-short,
-.mlv-minimap.is-narrow {
-  display: none;
-}
-
 /*
  * Viewer M3: the review walk's bar, a band at the foot of the diagram column, shown only while the
  * walk runs: directly above the bottom sheet's tabs, or with the side panel (1260 px and wider)
diff --git a/webview/src/types.ts b/webview/src/types.ts
index 807a98df..41dae8a2 100644
--- a/webview/src/types.ts
+++ b/webview/src/types.ts
@@ -232,9 +232,17 @@ export interface ViewState {
    * it, and a new revision opens on About.
    */
   railTab: RailTab;
-  /** Optional: the minimap's collapsed tab survives a reload the way `collapsed` does. */
+  /**
+   * Viewer M3: the phase index folded to its pill, or hidden (the ... menu). Absent at its default
+   * (shown, unfolded).
+   */
+  phaseIndex?: 'folded' | 'hidden';
+  /**
+   * Written before viewer M3, when the minimap was collapsed to its tab. No longer written; a saved
+   * `true` with no `phaseIndex` opens the phase index folded.
+   */
   minimapCollapsed?: boolean;
-  /** Optional: flow animation on/off, like `minimapCollapsed`. Absent = on. */
+  /** Optional: flow animation on/off. Absent = on. */
   flow?: boolean;
   /** Optional: the legend panel's open state, remembered per viewer (VIEW-10). */
   legendOpen?: boolean;
diff --git a/webview/src/ui/appkeys.ts b/webview/src/ui/appkeys.ts
index 0a64441e..fe4af378 100644
--- a/webview/src/ui/appkeys.ts
+++ b/webview/src/ui/appkeys.ts
@@ -9,8 +9,9 @@
  * nothing else calls them:
  *
  *  - THE Escape cascade, in this exact order — shortcut sheet -> the Refine…
- *    popover -> legend -> the review walk (viewer M3) -> the open bottom panel (viewer M2) ->
- *    focus mode -> selection -> blur.
+ *    popover -> the phase index's open list (viewer M3) -> legend -> the phase overview (viewer
+ *    M3) -> the review walk (viewer M3) -> the open bottom panel (viewer M2) -> focus mode ->
+ *    selection -> blur.
  *    One owner writes that order ONCE
  *    (CONTRACTS v1.1 §10.1, which is where v1.0 §11.13 now lives); whichever
  *    rung fires also stops the flow it owned.
@@ -57,6 +58,12 @@ export interface KeyContext {
   /** Viewer M2: collapse the open bottom panel to its tab strip; false when there is none. */
   collapseSheet(): boolean;
   announce(text: string): void;
+  /** Viewer M3: close the phase index's open list (the pill's); false when it was not open. */
+  closePhasePopover(): boolean;
+  /** Viewer M3: leave the phase overview for where the reader was; false when it was not open. */
+  closeOverview(): boolean;
+  /** Viewer M3: open or close the phase overview (Shift+0). */
+  toggleOverview(): void;
   /** Viewer M3: the review walk. */
   walking(): boolean;
   /** End the walk; false when it was not running. */
@@ -75,11 +82,16 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
       if (ctx.sheetOpen()) ctx.toggleShortcuts(false);
       // The panels that open over the diagram from the header, before anything on the canvas.
       else if (ctx.closeHeaderPanels()) return true;
+      // Viewer M3: the phase index's open list (the pill's), a small panel over the diagram.
+      else if (ctx.closePhasePopover()) return true;
       // The legend is a PANEL over the diagram, opened with `l` and closed with
       // its own [x] — and Escape is what a reader presses at a panel. It sits
       // above focus mode because it is the shallower thing on screen: dismissing
       // it must never also throw away the focus or selection underneath.
       else if (ctx.legendOpen()) ctx.closeLegend();
+      // Viewer M3: the phase overview covers the whole canvas; Escape goes back to the diagram as it
+      // was (the overview's own keys do the same when it has the focus).
+      else if (ctx.closeOverview()) return true;
       // Viewer M3: the review walk ends before anything it opened is closed: the claim it was on
       // stays selected and the bottom panel stays open on it. One Escape ends it, whatever else is
       // on screen below it, so it never takes two presses to leave the walk.
@@ -116,7 +128,7 @@ export function commandPortFor(ctx: KeyContext): CommandPort {
     fit: () => ctx.view().fit(),
     toggleFocusMode: () => ctx.view().toggleFocusMode(ctx.selection()),
     zoomToSelection: () => ctx.zoomToSelection(),
-    overview: () => ctx.view().overview(),
+    overview: () => ctx.toggleOverview(),
     toggleLegend: () => ctx.toggleLegend(),
     toggleFlow: () => ctx.toggleFlow(),
     // Viewer M2: a flow settles after two passes; Shift+A runs it again from its first pass.
diff --git a/webview/src/ui/chrome.ts b/webview/src/ui/chrome.ts
index 73afa03e..928f877d 100644
--- a/webview/src/ui/chrome.ts
+++ b/webview/src/ui/chrome.ts
@@ -73,8 +73,10 @@ export interface ChromeCallbacks {
   onZoom(dir: number): void;
   onToggleLegend(next: boolean): void;
   onToggleFlow(next: boolean): void;
-  /** `collapsed`: the minimap's new state (VIEW-12: the keyboard's way to it). */
-  onToggleMinimap(collapsed: boolean): void;
+  /** Viewer M3: show or hide the phase index (it replaced the minimap). */
+  onTogglePhaseIndex(shown: boolean): void;
+  /** Viewer M3: open the phase overview (Shift+0), or close it. */
+  onOverview(): void;
   onToggleRail(): void;
   onFitWhole(): void;
   onZoomToSelection(): void;
@@ -95,9 +97,12 @@ export interface ChromeState {
   visibleCounts: { low: number; medium: number; high: number };
   flowOn: boolean;
   legendOpen: boolean;
-  minimapCollapsed: boolean;
-  /** Viewer M2 live fix: why the minimap is not drawn now, or null when it is (the ... menu says it). */
-  minimapUnavailable: string | null;
+  /** Viewer M3: the reader has not hidden the phase index. */
+  phaseIndexShown: boolean;
+  /** Why the phase index is not drawn (fewer than two phases), or null when it is (the ... menu says it). */
+  phaseIndexUnavailable: string | null;
+  /** Viewer M3: the phase overview is open. */
+  overviewOpen: boolean;
   railOpen: boolean;
   /** The status bar's freshness item, or null before a document arrives. */
   freshness: FreshnessStatus | null;
@@ -444,8 +449,9 @@ export class Chrome {
       exceptionsOn: s.exceptionsOn,
       legendOpen: s.legendOpen,
       flowOn: s.flowOn,
-      minimapShown: !s.minimapCollapsed,
-      minimapUnavailable: s.minimapUnavailable,
+      phaseIndexShown: s.phaseIndexShown,
+      phaseIndexUnavailable: s.phaseIndexUnavailable,
+      overviewOpen: s.overviewOpen,
       railOpen: s.railOpen,
       walking: s.walking,
       railMode: s.railMode,
@@ -461,7 +467,8 @@ export class Chrome {
     else if (id === 'exceptions') cb.onToggleExceptions(!(this.state && this.state.exceptionsOn));
     else if (id === 'legend') cb.onToggleLegend(!(this.state && this.state.legendOpen));
     else if (id === 'flow') cb.onToggleFlow(!(this.state && this.state.flowOn));
-    else if (id === 'minimap') cb.onToggleMinimap(!(this.state && this.state.minimapCollapsed));
+    else if (id === 'phaseindex') cb.onTogglePhaseIndex(!(this.state && this.state.phaseIndexShown));
+    else if (id === 'overview') cb.onOverview();
     else if (id === 'rail') cb.onToggleRail();
     else if (id === 'fit') cb.onFitWhole();
     else if (id === 'zoomsel') cb.onZoomToSelection();
diff --git a/webview/src/ui/commands.ts b/webview/src/ui/commands.ts
index 4d37313c..b3219d96 100644
--- a/webview/src/ui/commands.ts
+++ b/webview/src/ui/commands.ts
@@ -21,7 +21,7 @@ export interface CommandPort {
   fit(): void;
   toggleFocusMode(): void;
   zoomToSelection(): void;
-  /** Collapse every group and fit (VIEW-10). */
+  /** Viewer M3: open or close the phase overview (Shift+0). */
   overview(): void;
   toggleLegend(): void;
   toggleFlow(): void;
diff --git a/webview/src/ui/keymap.ts b/webview/src/ui/keymap.ts
index c4d7cc98..effa186a 100644
--- a/webview/src/ui/keymap.ts
+++ b/webview/src/ui/keymap.ts
@@ -20,7 +20,11 @@ export interface KeyCommands {
   fit(): void;
   toggleFocusMode(): void;
   zoomToSelection(): void;
-  /** `Shift+0`: collapse every group and fit — the one-screen picture. */
+  /**
+   * `Shift+0` (viewer M3): open the phase overview, every phase as a block of its step titles, or
+   * close it. It used to fold every group and fit the whole diagram; the whole diagram is the ...
+   * menu's "Fit the whole diagram", and a group folds with its own chevron (or Space).
+   */
   overview(): void;
   /** `l`: show or hide the legend. */
   toggleLegend(): void;
@@ -83,9 +87,9 @@ export const KEYMAP: KeyBinding[] = [
   { keys: ['[', ']'], action: 'walkQuote', description: 'In the review walk: previous / next quote of the claim' },
   { keys: ['u', 'Shift+U'], action: 'walkNotObserved', description: 'Review walk on the claims not observed: start it, then next / previous one' },
   // Viewer M2: key 0 is the readable first view; the whole document is the ... menu's "Fit the
-  // whole diagram" (and Shift+0, which also folds the groups).
+  // whole diagram". Viewer M3: Shift+0 is the phase overview (it used to fold every group and fit).
   { keys: ['0'], action: 'fit', description: 'Readable view: the whole diagram if it fits at reading size, otherwise phase 1' },
-  { keys: ['Shift+0'], action: 'overview', description: 'Overview: collapse every group and fit the whole diagram' },
+  { keys: ['Shift+0'], action: 'overview', description: 'Phase overview: every phase as a block of its step titles; arrows move between phases, Enter goes to one, Escape comes back' },
   { keys: ['+', '='], action: 'zoomIn', description: 'Zoom in' },
   { keys: ['-', '_'], action: 'zoomOut', description: 'Zoom out' },
   { keys: ['z'], action: 'zoomToSelection', description: 'Zoom to the selection' },
@@ -106,7 +110,7 @@ export const KEYMAP: KeyBinding[] = [
   { keys: ['?'], action: 'shortcuts', description: 'Show this shortcut sheet' },
   // The rungs, in the order `dismissTopmost` runs them (CONTRACTS 11.13). The
   // sheet is the only place the cascade is described to the user (MLV-R1-F2-06).
-  { keys: ['Escape'], action: 'escape', description: 'Close the menu, this sheet, the Refine popover or the legend, end the review walk, collapse the bottom panel, exit focus mode, clear the selection, leave the canvas' },
+  { keys: ['Escape'], action: 'escape', description: 'Close the menu, this sheet, the Refine popover, the phase list or the legend, leave the phase overview, end the review walk, collapse the bottom panel, exit focus mode, clear the selection, leave the canvas' },
   { keys: ['Tab', 'Shift+Tab'], action: 'browser', description: 'Move focus out of the diagram (never intercepted)' },
 ];
 
@@ -195,7 +199,7 @@ export function handleCanvasKey(ev: KeyboardEvent, cmd: KeyCommands): boolean {
     return consume();
   }
   // Shift+0 arrives as ')' on a US layout and as '0' with `shiftKey` elsewhere;
-  // both mean Overview, and the plain `0` below must not swallow either.
+  // both mean the phase overview, and the plain `0` below must not swallow either.
   if (key === ')' || (key === '0' && ev.shiftKey)) {
     cmd.overview();
     return consume();
diff --git a/webview/src/ui/legend.ts b/webview/src/ui/legend.ts
index 811fcfd5..4c00638b 100644
--- a/webview/src/ui/legend.ts
+++ b/webview/src/ui/legend.ts
@@ -49,7 +49,9 @@ const EDGE_ROWS: LegendRow[] = [
 ];
 
 const PHASE_ROWS: LegendRow[] = [
-  { group: 'phase', key: 'order', label: 'phase colour', detail: 'Each phase gets a colour by its place in the document, shown on the lane\'s left rule, the swatch before its number and name, and the card\'s left edge. It means nothing else. Problems are the only other colour on the diagram.' },
+  { group: 'phase', key: 'order', label: 'phase colour', detail: 'Each phase gets a colour by its place in the document, shown on the lane\'s left rule, the swatch before its number and name, the card\'s left edge, and its number in the phase index and the phase overview. It means nothing else. Problems are the only other colour on the diagram.' },
+  // Viewer M3: the labelled phase index (it replaced the minimap) and the phase overview.
+  { group: 'phase', key: 'index', label: 'phase index', detail: 'The list in the lower right corner of the diagram: each phase\'s number, name, the findings that touch it and its step count, with the phases in view marked. A row goes to that phase. Beside the code it is one line, such as "4/6 Data loading", that opens the list. Shift+0 shows every phase as a block of its step titles (the phase overview).' },
 ];
 
 const FRESHNESS_ROWS: LegendRow[] = [
@@ -153,7 +155,7 @@ function swatchFor(row: LegendRow): Node {
     if (row.key === 'kinds') return el('span', 'mlv-chip', 'data');
     return edgeSwatch('observed', row.key === 'back');
   }
-  if (row.group === 'phase') return phaseSwatch();
+  if (row.group === 'phase') return row.key === 'index' ? el('span', 'mlv-chip', '4/6') : phaseSwatch();
   if (row.key === 'stale') {
     const chip = el('span', 'mlv-chip mlv-chip--stale');
     chip.appendChild(uiIcon('warning', 11));
@@ -164,8 +166,8 @@ function swatchFor(row: LegendRow): Node {
 }
 
 /**
- * The panel itself: anchored to the minimap corner of the canvas, collapsible,
- * and remembered per viewer through `ViewState.legendOpen`.
+ * The panel itself: anchored to the lower right corner of the canvas (over the phase index while
+ * it is open), collapsible, and remembered per viewer through `ViewState.legendOpen`.
  */
 export class Legend {
   readonly root: HTMLElement;
diff --git a/webview/src/ui/moremenu.ts b/webview/src/ui/moremenu.ts
index 15a00a24..0a2fa901 100644
--- a/webview/src/ui/moremenu.ts
+++ b/webview/src/ui/moremenu.ts
@@ -1,5 +1,5 @@
 /**
- * The header's ... menu (viewer M2): the review walk (viewer M3), the view toggles, the whole-diagram
+ * The header's ... menu (viewer M2): the review walk and the phase overview (viewer M3), the view toggles, the whole-diagram
  * fit, the exports and the shortcut sheet, plus whatever the header has no room for: search and the revision below 620 px,
  * and, in a row too narrow for its controls, the revision and the "not observed" toggle.
  *
@@ -22,9 +22,10 @@ export type MoreItemId =
   | 'about'
   | 'exceptions'
   | 'review'
+  | 'overview'
   | 'legend'
   | 'flow'
-  | 'minimap'
+  | 'phaseindex'
   | 'rail'
   | 'fit'
   | 'zoomsel'
@@ -53,9 +54,12 @@ const ITEMS: ItemSpec[] = [
   // Viewer M3: the review walk, always here (the header's Review button folds first when the row
   // is short); "End the review" while it runs.
   { id: 'review', label: 'Review the claims', icon: 'review', keys: 'R', group: true },
+  // Viewer M3: every phase as a block of its step titles; Shift+0 does the same.
+  { id: 'overview', label: 'Phase overview', icon: 'phases', keys: 'Shift+0' },
   { id: 'legend', label: 'Legend', icon: 'legend', keys: 'L', check: true, group: true },
   { id: 'flow', label: 'Connection flow animation', icon: 'flow', keys: 'A', check: true },
-  { id: 'minimap', label: 'Overview map', icon: 'minimap', check: true },
+  // Viewer M3: the labelled phase index replaced the overview map (the minimap).
+  { id: 'phaseindex', label: 'Phase index', icon: 'phaseindex', check: true },
   // Viewer M2 live fix: `b` on the canvas; Ctrl/Cmd+B also toggled the workbench's side bar.
   { id: 'rail', label: 'Side panel', icon: 'rail', keys: 'B', check: true },
   { id: 'fit', label: 'Fit the whole diagram', icon: 'fit', group: true },
@@ -82,12 +86,15 @@ export interface MoreMenuState {
   exceptionsOn: boolean;
   legendOpen: boolean;
   flowOn: boolean;
-  minimapShown: boolean;
+  /** Viewer M3: the reader has not hidden the phase index. */
+  phaseIndexShown: boolean;
   /**
-   * Viewer M2 live fix: why the minimap is not drawn now (too few cards, no room beside the code,
-   * a short canvas), or null. The item is then disabled, unchecked, and says why.
+   * Why the phase index is not drawn (fewer than two phases), or null. The item is then disabled,
+   * unchecked, and says why (the viewer M2 live fix's rule for the map it replaced).
    */
-  minimapUnavailable: string | null;
+  phaseIndexUnavailable: string | null;
+  /** Viewer M3: the phase overview is open (the item reads "Close the phase overview"). */
+  overviewOpen: boolean;
   railOpen: boolean;
   /** Viewer M3: the review walk is running (the item reads "End the review"). */
   walking: boolean;
@@ -122,7 +129,7 @@ export class MoreMenu {
     const uid = 'mlv-more' + ++menuSeq;
 
     this.button = iconButton('mlv-btn mlv-btn--icon mlv-btn--more', 'More actions');
-    this.button.title = 'More: legend, flow, fit, export, shortcuts';
+    this.button.title = 'More: review, phase overview, legend, fit, export, shortcuts';
     this.button.appendChild(uiIcon('more', 16));
     this.button.setAttribute('aria-haspopup', 'menu');
     this.button.setAttribute('aria-expanded', 'false');
@@ -169,7 +176,7 @@ export class MoreMenu {
       if (spec.folded) item.setAttribute('data-folded', '1');
       item.appendChild(uiIcon(spec.icon, 14));
       add(item, el('span', 'mlv-moremenu__label', spec.label));
-      if (spec.id === 'minimap') add(item, el('span', 'mlv-moremenu__note')).hidden = true;
+      if (spec.id === 'phaseindex') add(item, el('span', 'mlv-moremenu__note')).hidden = true;
       if (spec.keys) add(item, el('kbd', 'mlv-moremenu__keys', keyLabel(spec.keys))).setAttribute('aria-hidden', 'true');
       on(item, 'click', (ev: MouseEvent) => {
         ev.preventDefault();
@@ -245,19 +252,29 @@ export class MoreMenu {
         if (label) label.textContent = s.railMode === 'sheet' ? 'Bottom panel' : 'Side panel';
         item.title = s.railMode === 'sheet' ? 'Open or collapse the bottom panel' : 'Show or hide the side panel';
       }
+      if (id === 'overview') {
+        const label = item.querySelector('.mlv-moremenu__label');
+        if (label) label.textContent = s.overviewOpen ? 'Close the phase overview' : 'Phase overview';
+        item.title = s.overviewOpen
+          ? 'Back to the diagram where you were (Escape)'
+          : 'Every phase as a block of its step titles, with the connections between phases; choose one to go there';
+        item.disabled = !s.canExport;
+      }
       if (spec.check) {
-        const on_ = id === 'legend' ? s.legendOpen : id === 'flow' ? s.flowOn : id === 'minimap' ? s.minimapShown && !s.minimapUnavailable : id === 'exceptions' ? s.exceptionsOn : s.railOpen;
+        const on_ = id === 'legend' ? s.legendOpen : id === 'flow' ? s.flowOn : id === 'phaseindex' ? s.phaseIndexShown && !s.phaseIndexUnavailable : id === 'exceptions' ? s.exceptionsOn : s.railOpen;
         item.setAttribute('aria-checked', on_ ? 'true' : 'false');
       }
-      if (id === 'minimap') {
-        // Viewer M2 live fix: never checked while the map is not drawn; the reason is on the item.
+      if (id === 'phaseindex') {
+        // Never checked while the index is not drawn; the reason is on the item.
         const note = item.querySelector('.mlv-moremenu__note');
         if (note) {
-          note.textContent = s.minimapUnavailable || '';
-          note.hidden = !s.minimapUnavailable;
+          note.textContent = s.phaseIndexUnavailable || '';
+          note.hidden = !s.phaseIndexUnavailable;
         }
-        item.disabled = !!s.minimapUnavailable;
-        item.title = s.minimapUnavailable ? 'Overview map: ' + s.minimapUnavailable.charAt(0).toLowerCase() + s.minimapUnavailable.slice(1) : 'Show or hide the overview map';
+        item.disabled = !!s.phaseIndexUnavailable;
+        item.title = s.phaseIndexUnavailable
+          ? 'Phase index: ' + s.phaseIndexUnavailable.charAt(0).toLowerCase() + s.phaseIndexUnavailable.slice(1)
+          : 'Show or hide the phase index: each phase with its findings and steps, the phases in view marked';
       }
       if (id === 'zoomsel') item.disabled = !s.hasSelection;
       if (EXPORTS.indexOf(id) >= 0) item.disabled = !s.canExport;
diff --git a/webview/src/ui/overview.ts b/webview/src/ui/overview.ts
new file mode 100644
index 00000000..625e500a
--- /dev/null
+++ b/webview/src/ui/overview.ts
@@ -0,0 +1,362 @@
+/**
+ * Viewer M3, roadmap step 13: the phase overview's DOM (Shift+0). The geometry is
+ * `render/phaseoverview.ts`; this file only draws it, over the canvas and outside the world layer
+ * that pans and zooms, so nothing in the routed picture (or its golden) moves.
+ *
+ * Keyboard: each phase block is one focusable element of a roving group. ↓ / → and ↑ / ← move
+ * between blocks, Home and End jump to the first and last, Enter or Space goes to the phase, and
+ * Escape or Shift+0 goes back to where the reader was. Tab is never held. Every other key goes on
+ * to the canvas, whose handler closes the overview first and then acts (app/keys.ts).
+ *
+ * Names: a block is a button named "Phase 2 of 6: Data preparation. 9 steps (1 inferred). 2
+ * findings touch this phase. 3 connections to phase 3; 4 connections ahead to phase 5. Enter goes
+ * to this phase." and described by its list of titles, which ends with "… 7 more steps" when it is
+ * trimmed.
+ */
+
+import { add, clear, el, on, svg } from '../dom.js';
+import { uiIcon } from '../icons.js';
+import { countsTotal, severityCluster, severityGlyph, SEVERITY_WORD } from '../markers.js';
+import { stampPhase } from '../render/phase.js';
+import { phaseFindingsSpoken, phaseFindingsText } from '../render/nodes.js';
+import { blockStepsText, isNextLink, phaseOverviewLayout } from '../render/phaseoverview.js';
+import type { OverviewInput, OverviewLayout, OverviewPhase } from '../render/phaseoverview.js';
+
+export interface OverviewCallbacks {
+  /** Go to a phase (a click, or Enter / Space on its block). */
+  go(phaseId: string, byKeyboard: boolean): void;
+  /** Back to the diagram as it was (Escape, Shift+0, the Back button). */
+  back(): void;
+}
+
+let overviewSeq = 0;
+
+const plural = (n: number, one: string, many: string): string => n + ' ' + (n === 1 ? one : many);
+
+export class PhaseOverview {
+  readonly root: HTMLElement;
+  private content: HTMLElement;
+  private cb: OverviewCallbacks;
+  private uid: string;
+  private input: OverviewInput | null = null;
+  private layoutData: OverviewLayout | null = null;
+  private blockEls: HTMLElement[] = [];
+  private active = 0;
+  private disposers: (() => void)[] = [];
+
+  constructor(cb: OverviewCallbacks) {
+    this.cb = cb;
+    this.uid = 'mlv-ov' + ++overviewSeq;
+    this.root = el('section', 'mlv-overview');
+    this.root.setAttribute('aria-label', 'Phase overview');
+    this.root.hidden = true;
+    this.content = add(this.root, el('div', 'mlv-overview__content'));
+    this.disposers.push(on(this.root, 'keydown', (ev: KeyboardEvent) => this.onKey(ev)));
+    // The overview scrolls by itself; the canvas's wheel zoom must not see it (it would move the
+    // hidden diagram under the overlay).
+    this.disposers.push(on(this.root, 'wheel', (ev: WheelEvent) => ev.stopPropagation()));
+  }
+
+  get open(): boolean {
+    return !this.root.hidden;
+  }
+
+  /** The layout last drawn (tests and the harness read it). */
+  get layout(): OverviewLayout | null {
+    return this.layoutData;
+  }
+
+  /** The block that has (or would get) the focus, by position in drawn order. */
+  get activeIndex(): number {
+    return this.active;
+  }
+
+  /** Draw it for `input` at the canvas size and show it, with `activePhase` (drawn position) current. */
+  show(input: OverviewInput, w: number, h: number, activePhase: number): void {
+    this.root.hidden = false;
+    this.active = Math.max(0, Math.min(input.phases.length - 1, activePhase));
+    this.draw(input, w, h);
+    this.focusBlock(this.active);
+  }
+
+  hide(): void {
+    this.root.hidden = true;
+  }
+
+  /** Draw again for a new size or new data (a resize, a severity toggle), keeping the current block. */
+  redraw(input: OverviewInput, w: number, h: number): void {
+    if (!this.open) return;
+    const doc = this.root.ownerDocument;
+    const hadFocus = !!doc && !!doc.activeElement && this.root.contains(doc.activeElement);
+    this.active = Math.max(0, Math.min(input.phases.length - 1, this.active));
+    this.draw(input, w, h);
+    if (hadFocus) this.focusBlock(this.active);
+  }
+
+  focusBlock(i: number): void {
+    const block = this.blockEls[i];
+    if (!block) {
+      try {
+        this.root.focus();
+      } catch (_e) {
+        /* detached */
+      }
+      return;
+    }
+    this.active = i;
+    for (const [j, b] of this.blockEls.entries()) b.tabIndex = j === i ? 0 : -1;
+    try {
+      block.focus({ preventScroll: true });
+    } catch (_e) {
+      /* a host may have detached the overlay mid-gesture */
+    }
+    scrollIntoViewIfNeeded(this.root, block);
+  }
+
+  private draw(input: OverviewInput, w: number, h: number): void {
+    this.input = input;
+    const layout = phaseOverviewLayout(input, w, h);
+    this.layoutData = layout;
+    clear(this.content);
+    this.blockEls = [];
+    this.root.setAttribute('data-layout', layout.narrow ? 'narrow' : 'wide');
+    this.root.setAttribute('data-scrolls', layout.scrolls ? 'true' : 'false');
+    this.content.style.width = layout.width + 'px';
+    this.content.style.height = layout.height + 'px';
+
+    // Header: what this is, the way back, the counts and (with room) the key.
+    const header = add(this.content, el('div', 'mlv-overview__header'));
+    place(header, layout.header);
+    const top = add(header, el('div', 'mlv-overview__top'));
+    const title = add(top, el('h3', 'mlv-overview__title', 'Phase overview'));
+    title.id = this.uid + '-title';
+    this.root.setAttribute('aria-labelledby', title.id);
+    const back = add(top, el('button', 'mlv-btn mlv-overview__back')) as HTMLButtonElement;
+    back.type = 'button';
+    back.tabIndex = -1;
+    back.setAttribute('aria-label', 'Back to the diagram (Escape)');
+    back.title = 'Back to the diagram where you were (Escape or Shift+0)';
+    back.appendChild(uiIcon('close', 12));
+    add(back, el('span', 'mlv-overview__backlabel', 'Back'));
+    add(back, el('kbd', 'mlv-overview__kbd', 'Esc')).setAttribute('aria-hidden', 'true');
+    on(back, 'click', (ev: MouseEvent) => {
+      ev.preventDefault();
+      ev.stopPropagation();
+      this.cb.back();
+    });
+    const summary = add(header, el('p', 'mlv-overview__summary', layout.header.summary));
+    summary.id = this.uid + '-summary';
+    this.root.setAttribute('aria-describedby', summary.id);
+    if (layout.header.key) {
+      // The ◌ is drawn (a dotted ring), not typed: system fonts on macOS have no visible glyph for it.
+      const key = add(header, el('p', 'mlv-overview__key'));
+      layout.header.key.split('◌').forEach((part, k) => {
+        if (k > 0) key.appendChild(inferredMark());
+        key.appendChild(doc(header).createTextNode(part));
+      });
+    }
+
+    // Arrows and brackets under the blocks' text, in one SVG over the whole content.
+    const links = svg('svg', { class: 'mlv-overview__links', width: layout.width, height: layout.height, viewBox: '0 0 ' + layout.width + ' ' + layout.height, 'aria-hidden': 'true', focusable: 'false' });
+    const defs = svg('defs');
+    const marker = svg('marker', { id: this.uid + '-arrow', viewBox: '0 0 8 8', refX: 7, refY: 4, markerWidth: 7, markerHeight: 7, orient: 'auto-start-reverse' });
+    marker.appendChild(svg('path', { d: 'M0 0.6 7.4 4 0 7.4Z', class: 'mlv-overview__head' }));
+    defs.appendChild(marker);
+    links.appendChild(defs);
+    for (const a of layout.arrows) {
+      links.appendChild(svg('path', { class: 'mlv-overview__arrow', d: 'M' + a.x + ' ' + a.y1 + 'V' + a.y2, 'marker-end': 'url(#' + this.uid + '-arrow)' }));
+    }
+    for (const b of layout.brackets) {
+      const path = svg('path', {
+        class: 'mlv-overview__bracket',
+        d: 'M' + b.x0 + ' ' + b.y1 + 'H' + b.x + 'V' + b.y2 + 'H' + (b.x0 + 2),
+        'marker-end': 'url(#' + this.uid + '-arrow)',
+      });
+      if (b.back) path.setAttribute('data-back', 'true');
+      links.appendChild(path);
+    }
+    this.content.appendChild(links);
+    for (const a of layout.arrows) {
+      const label = add(this.content, el('span', 'mlv-overview__arrowlabel', plural(a.count, 'connection', 'connections')));
+      label.style.left = a.labelX + 'px';
+      label.style.top = a.labelY + 'px';
+      label.setAttribute('aria-hidden', 'true');
+    }
+    for (const b of layout.brackets) {
+      const from = input.phases[b.from];
+      const to = input.phases[b.to];
+      const count = add(this.content, el('span', 'mlv-overview__count', String(b.count)));
+      count.style.left = b.labelX + 'px';
+      count.style.top = b.labelY + 'px';
+      if (b.back) count.setAttribute('data-back', 'true');
+      count.setAttribute('aria-hidden', 'true');
+      count.title = plural(b.count, 'connection', 'connections') + ' from phase ' + (from.index + 1) + (b.back ? ' back to' : ' ahead to') + ' phase ' + (to.index + 1);
+    }
+
+    const list = add(this.content, el('ol', 'mlv-overview__blocks'));
+    list.setAttribute('aria-label', plural(input.phases.length, 'phase', 'phases'));
+    layout.blocks.forEach((block, i) => {
+      const phase = input.phases[block.phase];
+      const li = add(list, el('li', 'mlv-overview__item'));
+      const box = add(li, el('div', 'mlv-ovblock'));
+      box.setAttribute('role', 'button');
+      box.setAttribute('data-phase-id', phase.id);
+      box.setAttribute('data-block', String(i));
+      box.setAttribute('data-head', block.twoLineHead ? 'two-lines' : 'one-line');
+      stampPhase(box, phase.index);
+      box.tabIndex = i === this.active ? 0 : -1;
+      place(box, block);
+      box.setAttribute('aria-label', blockName(input, block.phase));
+      const head = add(box, el('div', 'mlv-ovblock__head'));
+      head.style.height = block.headH + 'px';
+      const name = add(head, el('div', 'mlv-ovblock__name'));
+      add(name, el('span', 'mlv-ovblock__num', String(phase.index + 1)));
+      const label = add(name, el('span', 'mlv-ovblock__label', phase.label));
+      label.title = 'Phase ' + (phase.index + 1) + ': ' + phase.label;
+      const meta = add(head, el('div', 'mlv-ovblock__meta'));
+      add(meta, el('span', 'mlv-ovblock__steps', blockStepsText(phase)));
+      const total = countsTotal(phase.findings);
+      if (total > 0) {
+        const cluster = severityCluster(phase.findings, 12, phaseFindingsSpoken(phase.findings));
+        if (cluster) meta.appendChild(cluster);
+        add(meta, el('span', 'mlv-ovblock__unit', phaseFindingsText(total)));
+      }
+      const steps = add(box, el('ul', 'mlv-ovblock__list'));
+      steps.id = this.uid + '-list-' + i;
+      box.setAttribute('aria-describedby', steps.id);
+      for (const item of block.items) {
+        const row = add(steps, el('li', 'mlv-ovitem'));
+        row.style.left = round1(item.x - block.x) + 'px';
+        row.style.top = round1(item.y - block.y) + 'px';
+        row.style.width = Math.max(0, item.w) + 'px';
+        if (item.step < 0) {
+          row.classList.add('mlv-ovitem--more');
+          row.textContent = '… ' + plural(item.more, 'more step', 'more steps');
+          continue;
+        }
+        const step = phase.steps[item.step];
+        row.setAttribute('data-node-ref', step.id);
+        if (item.depth) row.setAttribute('data-depth', String(item.depth));
+        if (step.basis && step.basis !== 'observed') row.setAttribute('data-basis', step.basis);
+        const mark = add(row, el('span', 'mlv-ovitem__mark', step.basis === 'unresolved' ? '?' : ''));
+        if (step.basis === 'inferred') mark.appendChild(inferredMark());
+        mark.setAttribute('aria-hidden', 'true');
+        if (step.basis === 'inferred' || step.basis === 'unresolved') add(row, el('span', 'mlv-sr', step.basis + ': '));
+        const text = add(row, el('span', 'mlv-ovitem__title', step.title));
+        text.title = step.title + (step.basis && step.basis !== 'observed' ? ' (' + step.basis + ')' : '');
+        if (step.tags.length) {
+          const tags = add(row, el('span', 'mlv-ovitem__tags'));
+          for (const tag of step.tags) {
+            const t = add(tags, el('span', 'mlv-ovitem__tag'));
+            t.setAttribute('data-sev', tag.severity);
+            t.title = tag.short + ' (' + tag.id + '), ' + SEVERITY_WORD[tag.severity] + ' severity';
+            const glyph = severityGlyph(tag.severity, 10, '');
+            glyph.setAttribute('aria-hidden', 'true');
+            glyph.removeAttribute('role');
+            t.appendChild(glyph);
+            add(t, el('span', 'mlv-ovitem__tagid', tag.short));
+          }
+          add(row, el('span', 'mlv-sr', ', ' + (step.tags.length === 1 ? 'finding ' : 'findings ') + step.tags.map((t) => t.short).join(' ')));
+        }
+      }
+      on(box, 'click', (ev: MouseEvent) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+        this.active = i;
+        this.cb.go(phase.id, ev.detail === 0);
+      });
+      on(box, 'focus', () => {
+        if (this.active === i) return;
+        this.active = i;
+        for (const [j, b] of this.blockEls.entries()) b.tabIndex = j === i ? 0 : -1;
+      });
+      this.blockEls.push(box);
+    });
+  }
+
+  private onKey(ev: KeyboardEvent): void {
+    if (ev.ctrlKey || ev.metaKey || ev.altKey) return;
+    const key = ev.key;
+    const n = this.blockEls.length;
+    let handled = true;
+    if (key === 'Escape' || key === ')' || (key === '0' && ev.shiftKey)) this.cb.back();
+    else if (key === 'ArrowDown' || key === 'ArrowRight') this.focusBlock(Math.min(n - 1, this.active + 1));
+    else if (key === 'ArrowUp' || key === 'ArrowLeft') this.focusBlock(Math.max(0, this.active - 1));
+    else if (key === 'Home') this.focusBlock(0);
+    else if (key === 'End') this.focusBlock(n - 1);
+    else if (key === 'Enter' || key === ' ') {
+      const phase = this.input && this.input.phases[this.active];
+      if (phase) this.cb.go(phase.id, true);
+    } else handled = false;
+    if (!handled) return;
+    // Marked handled (the panel's bootstrap then keeps VS Code from acting on an Escape), and kept
+    // from the canvas's own keys under the overlay (the arrows would move the selection).
+    ev.preventDefault();
+    ev.stopPropagation();
+  }
+
+  destroy(): void {
+    for (const dispose of this.disposers) {
+      try {
+        dispose();
+      } catch (_e) {
+        /* already torn down */
+      }
+    }
+    this.disposers = [];
+  }
+}
+
+/**
+ * The block's accessible name: the phase, its counts with their units, and its connections to
+ * other phases, as sentences. The titles are its description (the list inside it).
+ */
+export function blockName(input: OverviewInput, at: number): string {
+  const phase: OverviewPhase = input.phases[at];
+  const last = input.phases.length ? input.phases[input.phases.length - 1].index + 1 : 0;
+  const parts = ['Phase ' + (phase.index + 1) + ' of ' + Math.max(last, input.phases.length) + ': ' + phase.label + '.', blockStepsText(phase) + '.'];
+  const total = countsTotal(phase.findings);
+  if (total > 0) parts.push(phaseFindingsText(total) + '.');
+  const out: string[] = [];
+  for (const link of input.links) {
+    if (link.from !== at) continue;
+    const to = input.phases[link.to];
+    out.push(plural(link.count, 'connection', 'connections') + (isNextLink(link) ? ' to' : link.to < link.from ? ' back to' : ' ahead to') + ' phase ' + (to.index + 1));
+  }
+  if (out.length) parts.push(out.join('; ') + '.');
+  parts.push('Enter goes to this phase.');
+  return parts.join(' ');
+}
+
+/** The inferred mark, ◌, as a dotted ring the stylesheet draws (`.mlv-ovmark`). */
+function inferredMark(): HTMLElement {
+  const mark = el('span', 'mlv-ovmark');
+  mark.setAttribute('aria-hidden', 'true');
+  mark.setAttribute('data-mark', '◌');
+  return mark;
+}
+
+function doc(node: Node): Document {
+  return node.ownerDocument || document;
+}
+
+function place(element: HTMLElement, r: { x: number; y: number; w: number; h: number }): void {
+  element.style.left = r.x + 'px';
+  element.style.top = r.y + 'px';
+  element.style.width = r.w + 'px';
+  element.style.height = r.h + 'px';
+}
+
+/** Scroll the overlay so the focused block is wholly in view (it may be taller than the overlay). */
+function scrollIntoViewIfNeeded(scroller: HTMLElement, block: HTMLElement): void {
+  const top = block.offsetTop;
+  const bottom = top + block.offsetHeight;
+  const view = scroller.clientHeight;
+  if (!(view > 0)) return;
+  if (top < scroller.scrollTop) scroller.scrollTop = Math.max(0, top - 12);
+  else if (bottom > scroller.scrollTop + view) scroller.scrollTop = Math.min(top - 12, bottom - view + 12);
+}
+
+function round1(v: number): number {
+  return Math.round(v * 10) / 10;
+}
diff --git a/webview/src/ui/shell.ts b/webview/src/ui/shell.ts
index ccf241c1..9f239813 100644
--- a/webview/src/ui/shell.ts
+++ b/webview/src/ui/shell.ts
@@ -2,7 +2,7 @@
  * The application shell: the DOM skeleton and the canvas gestures.
  *
  * Structure only — no graph knowledge. `buildShell` returns the slots the app
- * fills (chrome, rail, tooltip, minimap, toasts, states) and `wireCanvasGestures`
+ * fills (chrome, rail, tooltip, toasts, states) and `wireCanvasGestures`
  * attaches pan, wheel-zoom and background-click, returning their disposers.
  */
 
@@ -15,8 +15,8 @@ import type { ViewportController } from '../render/canvas.js';
 export interface Shell {
   body: HTMLElement;
   /**
-   * The `
` landmark around the diagram (VIEW-12). The canvas, the minimap
-   * and the Pipeline Answer Card live inside it; the rail is a sibling `