diff --git a/.claude/launch.json b/.claude/launch.json
index f2bdcbb..259c354 100644
--- a/.claude/launch.json
+++ b/.claude/launch.json
@@ -12,6 +12,12 @@
       "runtimeExecutable": "uv",
       "runtimeArgs": ["run", "mdl", "serve", "-m", "demo/ibor/model", "--port", "4802"],
       "port": 4802
+    },
+    {
+      "name": "studio-ibor",
+      "runtimeExecutable": "mdl",
+      "runtimeArgs": ["studio", "-m", "demo/ibor/model", "--port", "4810"],
+      "port": 4810
     }
   ]
 }
diff --git a/README.md b/README.md
index 494c985..a0f409c 100644
--- a/README.md
+++ b/README.md
@@ -864,6 +864,40 @@ the published commit rather than resuming a previous session's branch — the
 checkout cache is disposable, and edits live in the browser's tray until you
 propose.
 
+**Identity on a shared server.** Solo, the acting user is whoever your git config
+says — zero setup. For a shared deployment, put a reverse proxy in front (oauth2-proxy,
+Pomerium, cloudflared, Azure App Proxy, nginx `auth_request`) that authenticates against
+your IdP — OIDC, SAML, anything — and injects an identity header. Modelith trusts that
+header and implements no OAuth flow itself, so SSO "just works":
+
+```bash
+export MDL_AUTH_TRUSTED_USER_HEADER=X-Auth-Request-Email   # turns header auth ON
+export MDL_AUTH_PROXY_SECRET_HEADER=X-Modelith-Proxy        # optional: prove it's the proxy
+export MDL_AUTH_PROXY_SECRET=…                              # (fails closed if unset)
+export MDL_AUTH_REQUIRE=1                                   # optional: refuse anonymous writes
+```
+
+The resolved identity — not a self-asserted name — becomes the commit author and the
+`sme/<identity>/…` branch. Safe by default: with none of this set, a raw
+`X-Forwarded-User` header is ignored, so an accidentally-exposed server never trusts a
+client-supplied identity. `/api/model` reports `identity: {name, email, source}` and
+Studio greets "Signed in as …" instead of asking for a name.
+
+**Audit log.** Point Modelith at your telemetry backend and every write — including the
+ones that were *refused* (which git can't show, since they never became a commit) — is
+recorded as an OpenTelemetry log record:
+
+```bash
+pip install 'modelith-dbt[audit]'                          # adds the OTLP exporter
+export OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4318   # → Splunk/Datadog/Grafana/…
+export MDL_AUDIT_LOG=/var/log/modelith/audit.jsonl         # and/or a local JSONL file
+```
+
+Records are `{ts, identity, source, op, target, outcome}` — who did what, when, and
+whether it was allowed — never the model's *contents* (those live in git for whoever has
+repo access). Off entirely when neither variable is set. `GET /api/audit` tails the local
+file and is admin-gated under `MDL_AUTH_REQUIRE`.
+
 **Distributing it.** The app is a client over the API, so it can be hosted anywhere:
 
 ```bash
diff --git a/canvas/src/api.ts b/canvas/src/api.ts
index 3dc84cd..4b663be 100644
--- a/canvas/src/api.ts
+++ b/canvas/src/api.ts
@@ -132,6 +132,12 @@ export const fetchRefDiff = (base: string, head: string) =>
 export const fetchClassification = (base = "HEAD") =>
   get<ClassificationDoc>(`/api/git/classify?base=${encodeURIComponent(base)}`);
 
+/** Route a STAGED proposal (not yet on disk): which reviewers/gates the change set
+ *  in the tray will face. Writes nothing. */
+export const classifyStaged = (
+  changes: { op: string; payload: Record<string, unknown> }[],
+) => post<ClassificationDoc>("/api/git/classify", { changes });
+
 export const fetchConflicts = (base: string) =>
   get<ConflictDoc>(`/api/git/conflicts?base=${encodeURIComponent(base)}`);
 
diff --git a/canvas/src/sme/ProposeDialog.tsx b/canvas/src/sme/ProposeDialog.tsx
index f6276f0..04792f2 100644
--- a/canvas/src/sme/ProposeDialog.tsx
+++ b/canvas/src/sme/ProposeDialog.tsx
@@ -10,6 +10,7 @@ import type { PendingChange } from "./SmeApp";
 export function ProposeDialog({
   changes,
   routeAdvice,
+  identity,
   user: initialUser,
   onUser,
   onDrop,
@@ -19,32 +20,49 @@ export function ProposeDialog({
   changes: PendingChange[];
   /** route/reviewers/gates for the staged change, for the split advice (§M6) */
   routeAdvice?: ClassificationDoc | null;
+  /** server-established identity (spec §17); when trusted, we greet instead of ask */
+  identity?: { name: string; email: string; source: "proxy" | "git" | "anonymous" } | null;
   user?: string;
   onUser?: (u: string) => void;
   onDrop: (idx: number) => void;
   onClose: () => void;
   onProposed: (result?: ProposeResult) => void;
 }) {
+  // A proxy- or git-established identity is authoritative: the server attributes the
+  // commit to it and IGNORES whatever name we send, so there is nothing to ask for.
+  const authenticated = Boolean(identity && identity.source !== "anonymous");
   const [user, setUser] = useState(initialUser || (localStorage.getItem("mdl.sme.user") ?? ""));
   const [title, setTitle] = useState(
     changes.length === 1 ? `Update ${changes[0].label.toLowerCase()}` : "Glossary updates",
   );
+  // The branch slug defaults to the title but is separately editable, so a modeler
+  // can prepend a ticket id (e.g. "PROJ-123-clarify-counterparty"). It follows the
+  // title until the user touches it, then stops so their edit is not overwritten.
+  const [slug, setSlug] = useState("");
+  const [slugTouched, setSlugTouched] = useState(false);
+  const effectiveSlug = slugify(slugTouched ? slug : title);
   const [body, setBody] = useState("");
   const [busy, setBusy] = useState(false);
   const [result, setResult] = useState<ProposeResult | null>(null);
   const [error, setError] = useState<string | null>(null);
 
   const submit = () => {
-    if (!user.trim()) return;
-    localStorage.setItem("mdl.sme.user", user.trim());
-    onUser?.(user.trim());
+    // An authenticated user needs no name; otherwise it is required for attribution.
+    if (!authenticated && !user.trim()) return;
+    if (!authenticated) {
+      localStorage.setItem("mdl.sme.user", user.trim());
+      onUser?.(user.trim());
+    }
     setBusy(true);
     setError(null);
     // The PR body is generated server-side from the real model diff, so the
     // reviewer sees a grouped, severity-tagged summary rather than this list.
+    // When authenticated the server overrides `user` with the trusted identity, so
+    // what we send here is only the fallback for an anonymous deployment.
     proposeChanges({
-      user: user.trim(),
-      slug: title,
+      user: authenticated ? "" : user.trim(),
+      // send the edited slug when the user set one, else let the title drive it
+      slug: effectiveSlug || title,
       title,
       body: body.trim(),
       changes: changes.map((c) => ({ op: c.op, payload: c.payload })),
@@ -113,20 +131,47 @@ export function ProposeDialog({
           ))}
         </ul>
 
-        <label className="sme-field">
-          <span>Your name (for attribution)</span>
-          <input value={user} onChange={(e) => setUser(e.target.value)} placeholder="e.g. a.hough" />
-        </label>
+        {authenticated ? (
+          <p className="sme-signed-in">
+            Signed in as <strong>{identity!.name}</strong>
+            {identity!.email ? ` (${identity!.email})` : ""} — this proposal is
+            attributed to you.
+          </p>
+        ) : (
+          <label className="sme-field">
+            <span>Your name (for attribution)</span>
+            <input
+              value={user}
+              onChange={(e) => setUser(e.target.value)}
+              placeholder="e.g. a.hough"
+            />
+          </label>
+        )}
         <label className="sme-field">
           <span>Title</span>
           <input value={title} onChange={(e) => setTitle(e.target.value)} />
         </label>
+        <label className="sme-field">
+          <span>Branch name (edit to add a ticket id, e.g. PROJ-123)</span>
+          <input
+            value={slugTouched ? slug : effectiveSlug}
+            onChange={(e) => {
+              setSlugTouched(true);
+              setSlug(e.target.value);
+            }}
+            placeholder="clarify-counterparty"
+          />
+        </label>
         <label className="sme-field">
           <span>Note for the reviewer (optional)</span>
           <textarea rows={2} value={body} onChange={(e) => setBody(e.target.value)} />
         </label>
 
-        <RouteAdvice cl={routeAdvice} user={user} />
+        <RouteAdvice
+          cl={routeAdvice}
+          user={authenticated ? identity!.name : user}
+          changeSlug={effectiveSlug}
+        />
 
         {error && <p className="sme-error-line">{error}</p>}
 
@@ -134,7 +179,11 @@ export function ProposeDialog({
           <button className="sme-secondary" onClick={onClose}>
             Keep editing
           </button>
-          <button className="sme-primary" disabled={busy || !user.trim() || changes.length === 0} onClick={submit}>
+          <button
+            className="sme-primary"
+            disabled={busy || (!authenticated && !user.trim()) || changes.length === 0}
+            onClick={submit}
+          >
             {busy ? "Submitting…" : "Submit for review"}
           </button>
         </div>
@@ -147,10 +196,20 @@ export function ProposeDialog({
  *  B > E > C > A), so a definition fix bundled with a structural change waits on
  *  architects instead of a steward. Saying so, and naming where it goes, is advice
  *  erwin has no route model to give. */
-function RouteAdvice({ cl, user }: { cl?: ClassificationDoc | null; user: string }) {
+function RouteAdvice({
+  cl,
+  user,
+  changeSlug,
+}: {
+  cl?: ClassificationDoc | null;
+  user: string;
+  /** the (possibly ticket-prefixed) change slug, so the preview shows the real
+   *  branch rather than an ellipsis */
+  changeSlug?: string;
+}) {
   if (!cl?.primary) return null;
   const reviewers = cl.reviewers_actual ?? cl.reviewers;
-  const slug = (user || "you").toLowerCase().replace(/[^a-z0-9]+/g, "-").replace(/^-|-$/g, "");
+  const slug = slugify(user || "you");
   const mixed = cl.routes.length > 1;
   return (
     <>
@@ -166,7 +225,7 @@ function RouteAdvice({ cl, user }: { cl?: ClassificationDoc | null; user: string
       <div className="sub-dest">
         <div className="row">
           <span className="k">Goes to</span>
-          <code>sme/{slug}/…</code>
+          <code>sme/{slug}/{changeSlug || "…"}</code>
         </div>
         <div className="row">
           <span className="k">Reviewers</span>
@@ -176,3 +235,10 @@ function RouteAdvice({ cl, user }: { cl?: ClassificationDoc | null; user: string
     </>
   );
 }
+
+/** Slugify a branch fragment the same way the server does (mdl_server.git_api
+ *  ._slugify): lowercase, non-alphanumerics to single hyphens, trimmed. Keeping the
+ *  rule identical means the branch preview matches the branch the server creates. */
+function slugify(s: string): string {
+  return s.toLowerCase().replace(/[^a-z0-9]+/g, "-").replace(/^-|-$/g, "") || "change";
+}
diff --git a/canvas/src/sme/ReviewScreen.tsx b/canvas/src/sme/ReviewScreen.tsx
index 189d8f5..ba69336 100644
--- a/canvas/src/sme/ReviewScreen.tsx
+++ b/canvas/src/sme/ReviewScreen.tsx
@@ -15,6 +15,7 @@ export function ReviewScreen({
    *  diffs the working tree — which staging never touches, so a staged edit showed
    *  as an empty diff. */
   stagedDiff,
+  stagedRoute,
   user,
   onBack,
   onSubmit,
@@ -24,6 +25,9 @@ export function ReviewScreen({
   selectable,
 }: {
   stagedDiff?: ModelDiffDoc | null;
+  /** route/reviewers/gates for the STAGED set (POST /api/git/classify); the
+   *  working-tree GET classify shows "no route" for an unwritten proposal */
+  stagedRoute?: ClassificationDoc | null;
   user: string;
   onBack: () => void;
   onSubmit: (cl: ClassificationDoc | null) => void;
@@ -52,11 +56,17 @@ export function ReviewScreen({
             .then((d) => (d.ok ? setDiff(d) : setError(d.error ?? "could not read the model")))
             .catch((e) => setError(String(e)));
         }
-        fetchClassification("HEAD").then(setCl).catch(() => undefined);
+        // A staged proposal is not on disk, so the working-tree classify sees nothing;
+        // use the route computed for the staged set when we have one.
+        if (stagedRoute) {
+          setCl(stagedRoute);
+        } else {
+          fetchClassification("HEAD").then(setCl).catch(() => undefined);
+        }
         fetchConflicts(base).then(setConf).catch(() => undefined);
       })
       .catch((e) => setError(String(e)));
-  }, [user, stagedDiff]);
+  }, [user, stagedDiff, stagedRoute]);
 
   useEffect(load, [load]);
 
diff --git a/canvas/src/sme/SmeApp.tsx b/canvas/src/sme/SmeApp.tsx
index 8fdb3fc..400dea3 100644
--- a/canvas/src/sme/SmeApp.tsx
+++ b/canvas/src/sme/SmeApp.tsx
@@ -1,12 +1,25 @@
 import { useCallback, useEffect, useMemo, useState } from "react";
-import { fetchGlossary, fetchGlossaryConfig, fetchModel, sendCommand } from "../api";
+import {
+  classifyStaged,
+  fetchGlossary,
+  fetchGlossaryConfig,
+  fetchModel,
+  previewChanges,
+  sendCommand,
+} from "../api";
 import {
   collapseKey,
   dependentKeys,
   useStaging,
   type PendingChange,
 } from "../staging/useStaging";
-import type { ClassificationDoc, GlossaryConfig, GlossaryDoc, ModelDoc } from "../types";
+import type {
+  ClassificationDoc,
+  GlossaryConfig,
+  GlossaryDoc,
+  ModelDiffDoc,
+  ModelDoc,
+} from "../types";
 import type { Exec } from "../exec";
 import { GitBanner } from "./GitBanner";
 import { ModelWorkspace } from "./ModelWorkspace";
@@ -46,6 +59,10 @@ export function SmeApp() {
   // objects the SME has unticked in the review screen (selective proposal)
   const [excluded, setExcluded] = useState<Set<string>>(new Set());
   const [user, setUser] = useState(() => localStorage.getItem("mdl.sme.user") ?? "");
+  // Server-established identity (spec §17). When the source is proxy or git, the
+  // acting user is known and trustworthy — the propose dialog greets them instead
+  // of asking for a name, and the server ignores any name we send anyway.
+  const [identity, setIdentity] = useState<ModelDoc["identity"] | null>(null);
   const [modelDoc, setModelDoc] = useState<ModelDoc | null>(null);
   // engineer mode: the server was started with --direct, so edits write the tree
   const [direct, setDirect] = useState(false);
@@ -154,6 +171,34 @@ export function SmeApp() {
     [pending, staging.pending],
   );
 
+  // The Review screen must diff the WHOLE proposal — glossary-tray edits AND
+  // model-tray edits together. `staging.previewDiff` covers only the model tray, so
+  // a definition edited on the Terms tab (which lands in `pending`) showed as an
+  // empty diff and left Submit disabled. Preview the combined set here so the review
+  // reflects everything staged, from either surface.
+  const [reviewDiff, setReviewDiff] = useState<ModelDiffDoc | null>(null);
+  const [reviewRoute, setReviewRoute] = useState<ClassificationDoc | null>(null);
+  useEffect(() => {
+    if (!allPending.length) {
+      setReviewDiff(null);
+      setReviewRoute(null);
+      return;
+    }
+    const ctrl = new AbortController();
+    const changes = allPending.map((c) => ({ op: c.op, payload: c.payload }));
+    previewChanges(changes, subjectArea || undefined, ctrl.signal)
+      .then((p) => setReviewDiff(p.diff ?? null))
+      .catch((e) => {
+        if ((e as Error).name !== "AbortError") setReviewDiff(null);
+      });
+    // Route the staged set too, so the reviewers/gates panel is correct before the
+    // proposal is written — the working-tree classify would show "no route".
+    classifyStaged(changes)
+      .then(setReviewRoute)
+      .catch(() => setReviewRoute(null));
+    return () => ctrl.abort();
+  }, [allPending, subjectArea]);
+
   // Only the changes that actually depend on a staged creation are locked
   // together; everything else can still be proposed selectively.
   const locked = useMemo(() => dependentKeys(allPending), [allPending]);
@@ -201,6 +246,12 @@ export function SmeApp() {
         setProjectName(m.project.name);
         setModelDoc(m);
         setDirect(Boolean(m.direct));
+        setIdentity(m.identity ?? null);
+        // A trusted identity seeds the display name so "your proposals" and the
+        // route advice slug reflect the real user without a manual entry.
+        if (m.identity && m.identity.source !== "anonymous" && m.identity.name) {
+          setUser(m.identity.name);
+        }
       })
       .catch(() => undefined);
     fetchGlossaryConfig()
@@ -304,7 +355,8 @@ export function SmeApp() {
 
       {view === "review" ? (
         <ReviewScreen
-          stagedDiff={staging.previewDiff}
+          stagedDiff={reviewDiff}
+          stagedRoute={reviewRoute}
           user={user}
           selectable={selectable}
           excluded={excluded}
@@ -420,6 +472,7 @@ export function SmeApp() {
         <ProposeDialog
           changes={allPending}
           routeAdvice={routeAdvice}
+          identity={identity}
           user={user}
           onUser={(u) => {
             setUser(u);
diff --git a/canvas/src/sme/sme.css b/canvas/src/sme/sme.css
index c7ba570..5524a5b 100644
--- a/canvas/src/sme/sme.css
+++ b/canvas/src/sme/sme.css
@@ -133,6 +133,10 @@ body { font-family: var(--font); background: var(--bg); color: var(--text); }
 .sme-diff-after { color: var(--ok); font-size: 13px; }
 .sme-modal-foot { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }
 .sme-error-line { color: var(--err); font-size: 13px; }
+.sme-signed-in { margin-top: 14px; font-size: 13px; color: var(--text-dim);
+  background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px;
+  padding: 10px 12px; }
+.sme-signed-in strong { color: var(--text); }
 .sme-modal a { color: var(--accent); }
 
 /* --- model git-ops screens (plan §M) --------------------------------------------
diff --git a/canvas/src/types.ts b/canvas/src/types.ts
index c9ee330..ad502c9 100644
--- a/canvas/src/types.ts
+++ b/canvas/src/types.ts
@@ -146,6 +146,10 @@ export interface ModelDoc {
   fingerprint: string;
   read_only: boolean;
   domains: string[];
+  /** Who the server resolved this request to (spec §17). `source` is "proxy" (a
+   * trusted reverse-proxy header authenticated the user), "git" (the server's git
+   * config), or "anonymous" (nothing established — the client must ask for a name). */
+  identity?: { name: string; email: string; source: "proxy" | "git" | "anonymous" };
 }
 
 // --- ontology (E1) ---
diff --git a/modelith-spec.md b/modelith-spec.md
index 29a3d07..88e700e 100644
--- a/modelith-spec.md
+++ b/modelith-spec.md
@@ -574,3 +574,312 @@ The PR comment format matters more than it sounds. Render added/dropped/type-cha
 - No warehouse-side execution beyond optional profiling for inference.
 - No LLM in the critical path. AI assists naming, term matching and description drafting; it never decides a relationship or writes to a catalog without a recorded human verdict.
 - No canvas before M5.
+
+---
+
+# Part II — Enterprise adoption (Principal-Architect / PM review)
+
+*Added on the `experimental` branch. Part I above is the build spec for the tool
+itself and is not changed by this part — where Part I is good it stays. This part
+adds only what enterprise adoption requires, sequenced so a solo user never pays for
+a feature only a shared deployment needs.*
+
+## 15. Where Modelith stands, and against whom
+
+The defensible wedge, confirmed by a competitive scan (erwin, ER/Studio, SqlDBM,
+Ellie.ai, Hackolade, Azimutt; dbt Canvas + Semantic Layer/MetricFlow, Cube; Collibra,
+Alation, Atlan, Purview, DataHub, OpenMetadata, Unity Catalog; TopBraid, Stardog,
+PoolParty; Stoplight, Backstage):
+
+> **An ontology-anchored logical/ER model held in git as plain YAML, that
+> forward-generates contract-enforced dbt, reverse-engineers dbt back, and classifies
+> the drift between them — a round-trip no single competitor offers.**
+
+Each pillar alone is contested. The combination is not. Two consequences shape
+priorities:
+
+- **The sharpest threat is dbt Canvas** (GA, dbt Enterprise-gated). It already nails
+  the visual-editor → *Commit → open a PR* workflow that Modelith pitches for the
+  steward persona, and it is bundled for teams already on dbt Cloud. Modelith must
+  lead with what Canvas lacks: a real **logical/ER + conceptual layer**, **ontology
+  alignment**, **reverse + drift classification**, and life **outside the dbt Cloud
+  walled garden** (any warehouse, any git host, self-hostable, offline-capable).
+- **"The model lives in git, every tool is a client" is now table stakes**, not a
+  differentiator — Stoplight (API specs), Backstage (`catalog-info.yaml`), and dbt
+  itself all do it. Modelith's git-nativeness is necessary, not sufficient; the
+  round-trip is the moat.
+
+**Do not chase** the things the platforms above own and a git-YAML design tool
+structurally cannot: automated estate-wide metadata crawling, column-level *runtime*
+lineage from query logs, and data-quality/observability. Modelith captures *intended
+design and contract relationships*; it should emit lineage (it already plans
+OpenLineage, §9.6) and let a governance platform sit above it, not try to become one.
+
+## 16. The enterprise-adoption gap, ranked
+
+The single hardest procurement blocker is **identity**. Modelith today has *no*
+authentication: the acting user is a self-asserted free-text string
+(`ProposeBody.user`, browser `localStorage["mdl.sme.user"]`) threaded into a git
+`Co-authored-by` trailer. Anyone can claim to be anyone. Every commercial competitor
+clears this bar; a solo user does not need it. That tension — enterprise needs
+verified identity, solo needs zero friction — is resolved in §17.
+
+Ranked, most-blocking first. Each is a *requirement* enterprises impose; the roadmap
+in §18 sequences them.
+
+1. **Verified identity (SSO-compatible).** Who authored a proposal must be
+   trustworthy, without Modelith implementing any IdP flow. → **§17, specified, build
+   now.**
+2. **Authorization / RBAC.** Not everyone may edit everything. Modelith's honest
+   answer is *git already does this* — branch protection + CODEOWNERS decide who
+   merges — but that must be documented as the RBAC story and surfaced, not left
+   implicit. → §18 M8.
+3. **Audit trail for administrative events.** Git history records *model* changes;
+   it does not record *who was let in, what config changed, who was denied*. A
+   thin append-only audit log of identity/permission/config events. → §18 M9.
+4. **SOC 2 Type II readiness.** Process/organizational, not code — but the code must
+   not block it (deterministic builds, no telemetry-by-default, documented data
+   flows). Called out so it is tracked, not built. → §18 M9.
+5. **Lineage emission enterprises can consume.** OpenLineage is already planned
+   (§9.6); ship it and integrate with Atlan/Collibra/DataHub rather than competing on
+   observed lineage. → existing M5, reaffirmed.
+
+## 17. Identity — a thin, IdP-agnostic seam
+
+**Principle: solo pays nothing.** With nothing configured, identity resolves to the
+user's own git config (exactly like a normal `git commit`), and if even that is
+absent, to anonymous. There is no login, no account, no server-side user store, ever
+(this restates and does not weaken §13.5 / §14: *state stays in git*).
+
+**Principle: trust the proxy, not the client.** The near-universal enterprise pattern
+is a reverse proxy (oauth2-proxy, Pomerium, cloudflared, nginx `auth_request`, Azure
+App Proxy) that authenticates against the org IdP — OIDC, SAML, whatever — and injects
+an identity header. Modelith trusts *that header* and implements **no** OAuth/OIDC/SAML
+flow itself. This makes every IdP "just work" and keeps Modelith out of token
+validation, key rotation, redirect URIs, and four provider code paths.
+
+### 17.1 Resolution
+
+A single module `mdl_server/identity.py`:
+
+```
+Identity(name, email, source)          source ∈ {"proxy", "git", "anonymous"}
+IdentityPolicy.from_env(os.environ)    resolved once at create_app time, immutable
+resolve_identity(headers, policy, model_dir) -> Identity
+```
+
+Precedence: **trusted header** (only if the operator opted in) → **git config** of the
+model dir → **anonymous**. A request with a raw `X-Forwarded-User` and no configured
+policy resolves to *anonymous*, never proxy — the safe default.
+
+### 17.2 Configuration (env vars, namespaced `MDL_AUTH_*`)
+
+| Env var | Purpose | Default |
+|---|---|---|
+| `MDL_AUTH_TRUSTED_USER_HEADER` | Header the trusted proxy sets with the user's email/id (e.g. `X-Auth-Request-Email`). **Its presence is the master switch that turns header auth ON.** | unset ⇒ OFF |
+| `MDL_AUTH_TRUSTED_NAME_HEADER` | Optional display-name header. | unset ⇒ derive from email local-part |
+| `MDL_AUTH_PROXY_SECRET_HEADER` | Optional header the proxy must present to prove it *is* the proxy. | unset |
+| `MDL_AUTH_PROXY_SECRET` | Expected value of that header (constant-time compared). If the secret *header* is set but this is empty ⇒ **fail closed** (header auth off). | unset |
+
+Config is deployment/environment data, so it lives in env vars read inside
+`create_app` — `serve()` and the CLI need no signature change. A separate hardening
+switch, `MDL_AUTH_REQUIRE=1` (truthy: `1`/`true`/`yes`/`on`/`require`), makes every
+*write* endpoint (`/propose`, `/commit`, `/discard`, `/api/command`,
+`/api/decisions/{k}/verdict`) refuse an anonymous identity with **403** rather than
+committing under a self-asserted name. Off by default, so a solo user with no git
+identity is never blocked. **Built** (see M8).
+
+### 17.3 Effects
+
+- `/api/model` gains an `identity` block `{name, email, source}`. The Studio app reads
+  it: when `source != "anonymous"` it shows "signed in as {name}" and stops asking for
+  a name / stops sending `user`.
+- **Propose author precedence** (`_effective_author`): `proxy` overrides any
+  client-supplied `user` (the whole enterprise point); `git` uses the git-config
+  identity (correct solo behavior); `anonymous` falls back to `body.user` (no
+  regression). The proposal branch name and the `Co-authored-by` trailer are built
+  from the *effective* author, not the self-asserted string.
+- **Reads are never gated by identity.** Identity is a write-time concern; a read-only
+  viewer (catalog browse, the week-3 gate) needs none. `/api/model` may still carry
+  the block so the UI can greet the viewer.
+
+### 17.4 Explicit non-goals for identity
+
+No OAuth/OIDC/SAML flow, no JWT/JWKS verification, no token vault, no user database,
+no roles table, no sessions/cookies/login page, and no change to *push credentials*
+(identity ≠ credentials — the server keeps pushing with its own git credentials, a
+deploy key the operator sets up). Authorization stays in git (branch protection +
+CODEOWNERS). Keeping the seam this thin is what preserves the solo promise.
+
+## 18. Roadmap deltas (append to §12 milestones)
+
+**M7, identity seam.** `identity.py`; `IdentityPolicy` from `MDL_AUTH_*`;
+`/api/model` `identity` block; propose author precedence; Studio "signed in as".
+*Accept:* a POST `/propose` carrying a trusted user header and a *different*
+self-asserted `user` produces a commit attributed to the header identity, not the
+spoofed string; with no policy configured, propose still attributes to git config and
+all existing tests stay green.
+
+**M8, authorization story.** Git-native RBAC is the model: branch protection +
+CODEOWNERS decide who MERGES; the `/api/git/classify` route already computes the
+review route, the real CODEOWNERS reviewers (`_codeowners_reviewers`), and the CI
+gates a proposal will face, surfaced in the propose dialog's route advice. **Done:**
+the `MDL_AUTH_REQUIRE` write gate — every write endpoint returns 403 for an anonymous
+identity when set (`write_denied_reason` in identity.py), verified anonymous→403 /
+proxy→200 in tests and against the running server.
+**Also done:** the Review screen and the route/reviewer panel now read the STAGED
+change set, not the working-tree diff. Previously a purely staged proposal showed "0
+changes / no route" and Submit was disabled — the steward could not propose at all.
+The Review screen diffs the combined tray via `/api/preview`; a new
+`POST /api/git/classify` previews the change set to learn which files it touches
+(`preview_changed_paths`) and routes those, so reviewers/gates are correct before
+anything is written. Verified end-to-end: a definition edit shows a real before/after
+diff, routes to A · Meaning · data-stewards, and submits to
+`sme/<identity>/…` authored by the resolved identity.
+
+**M9, audit + SOC 2 readiness.** Append-only audit log of write/administrative
+events (distinct from git model history); a documented data-flow / no-egress
+statement; deterministic-build evidence.
+*Accept:* every write endpoint emits an audit record `{ts, identity, source, op,
+target, outcome}`; the log is append-only and queryable; a security reviewer can
+trace any administrative event. **Built** — see §20.
+
+## 19. Anti-goals (append to §14)
+
+- **Modelith is not a data catalog or observability platform.** It emits lineage
+  (OpenLineage) and definitions for one; it does not crawl the estate, compute
+  runtime lineage, or run data-quality checks.
+- **Modelith implements no identity-provider protocol.** It trusts a proxy header or
+  git config. SSO is the proxy's job.
+- **No server-side user or permission store.** Identity is resolved per request;
+  authorization lives in git.
+
+## 20. Audit log
+
+### 20.1 Why, and what it is NOT
+
+Git already records every *model* change — who edited which YAML, when, in which
+commit. What git does **not** record is the *administrative* history a compliance
+reviewer asks for: who was let in, what a request tried to do and whether it was
+allowed or refused, a write that was rejected (so never became a commit), a decision
+verdict, a config-level action. SOC 2 Type II and regulated buyers require a
+queryable, append-only trail of exactly these events. That is the whole and only job
+of the audit log.
+
+Deliberately **not** the audit log's job: replacing git history (model diffs live in
+git), being a metrics/analytics pipeline, or capturing reads (a read is not an
+attributable change — capturing every `/api/model` would bury the signal and leak
+what someone merely *looked* at).
+
+### 20.2 OpenTelemetry-native
+
+An audit event IS an **OpenTelemetry log record** (the OTel *logs* signal). Modelith
+emits it once through the OTel SDK; where the events go is the operator's choice via
+standard OTel configuration, not a Modelith-specific one. This means an enterprise
+that already runs an OTLP collector (Splunk, Datadog, Grafana/Loki, Honeycomb, any
+OpenTelemetry Collector) gets Modelith's audit trail in the same place as everything
+else, with no bespoke integration — the whole reason to be OTel-compatible rather
+than inventing a format.
+
+Concretely, `mdl_server/audit.py` holds a `LoggerProvider` with:
+
+- an **OTLP log exporter** (`opentelemetry-exporter-otlp`) that activates when the
+  standard `OTEL_EXPORTER_OTLP_ENDPOINT` (or `…_LOGS_ENDPOINT`) env var is set —
+  Modelith honours the OTel spec's own variables (`OTEL_SERVICE_NAME`,
+  `OTEL_RESOURCE_ATTRIBUTES`, headers, protocol) rather than reinventing them; and
+- a **JSONL file exporter** — a tiny custom `LogRecordExporter` writing one line per
+  record — as the always-available local fallback and the CLI/`GET /api/audit`
+  source.
+
+Both are just exporters on the same provider: the event is constructed once, and each
+configured exporter receives it. `opentelemetry-sdk` + `opentelemetry-exporter-otlp`
+are the only new dependencies, optional-extra-gated (`modelith[audit]`) so the core
+CLI stays dependency-light; if the packages are absent, audit degrades to the JSONL
+file writer alone (no OTLP), never an import error.
+
+`resource` carries `service.name=modelith` and the model/project name, so records are
+attributable to a deployment in a multi-service backend. When a request already has
+trace context, the audit record is stamped with its `trace_id`/`span_id`, so an audit
+event ties back to the request span in the same trace view.
+
+### 20.3 The record
+
+Emitted as an OTel LogRecord: `Timestamp` (UTC, ns), `SeverityNumber`
+(`INFO` for `ok`, `WARN` for `denied`, `ERROR` for `error`), a stable `Body`
+(`"audit"`), and structured `Attributes` under an `mdl.audit.*` namespace. The JSONL
+exporter flattens the same fields to one line:
+
+```json
+{"ts":"2026-09-10T14:22:31.004Z","identity":"anita.hough@corp.com",
+ "source":"proxy","op":"propose","target":"sme/anita-hough-corp-com/proj-123",
+ "outcome":"ok","detail":"3 changes, route A",
+ "trace_id":"7b2e…","span_id":"a19c…"}
+```
+
+- `ts` — UTC, ISO-8601 in the file; OTel `Timestamp` on the record.
+- `identity` / `source` (`mdl.audit.identity` / `mdl.audit.source`) — the
+  SERVER-resolved identity and how it was established (`proxy` | `git` | `anonymous`),
+  the same values §17 already computes. This is why audit is built *after* identity:
+  an audit record is only as trustworthy as the identity on it.
+- `op` (`mdl.audit.op`) — the action: `command`, `propose`, `commit`, `discard`,
+  `verdict`.
+- `target` (`mdl.audit.target`) — what it acted on: the branch for a propose, the op
+  name for a command, the signal key for a verdict. Never the full payload (see 20.5).
+- `outcome` (`mdl.audit.outcome`) — `ok` | `denied` | `error`. **A denied or errored
+  write is recorded**, which is the point: git can only show writes that succeeded, so
+  the refusals — the events a security reviewer most wants — would otherwise be
+  invisible.
+- `detail` (`mdl.audit.detail`) — a short, non-sensitive human note (count of
+  changes, the route, the denial reason). Optional.
+
+### 20.4 Where it lives — outside the model tree
+
+The server never writes model files (§13.5), and state stays in git (§14). The JSONL
+fallback is *operational* state, not model state, so it must not land in the model dir
+(it would pollute the git working tree, trip the fingerprint cache, and risk being
+committed into a proposal). Configuration, in order:
+
+1. `OTEL_EXPORTER_OTLP_ENDPOINT` set ⇒ export to the collector (plus the JSONL file if
+   also configured). The enterprise answer — no Modelith-specific plumbing.
+2. `MDL_AUDIT_LOG=/var/log/modelith/audit.jsonl` ⇒ write the local JSONL file (with or
+   without OTLP). The directory is created if absent.
+3. Neither set ⇒ **audit is OFF**. Solo users get nothing to configure, no stray file,
+   no exporter — auditing a single-user laptop is noise.
+
+Export is best-effort and never fails a request: a full disk, an unreachable collector,
+or a permission error is logged to stderr, not surfaced to the user — an audit sink
+outage must not take down editing. (A deployment that needs *hard* "no write without a
+durable audit record" is a stricter mode noted as future work, not the default.)
+
+### 20.5 Append-only, and the read surface
+
+- The JSONL exporter only ever appends; it never rewrites or truncates. OTLP records
+  are append-only by nature. Tamper-*evidence* (an OS-level append-only file,
+  `chattr +a`, or the immutability guarantees of the SIEM the OTLP data lands in) is
+  the operator's to enforce — Modelith documents the contract and does not pretend to
+  guarantee immutability on a file it can also open.
+- `GET /api/audit?limit=&op=&identity=` returns the most recent records from the local
+  JSONL file (newest first), filterable — enough for "show me everything anon tried"
+  without shipping a query engine (the collector/SIEM is the real query surface when
+  OTLP is on). **This endpoint is admin-only**: served only when auditing is
+  configured, and gated behind the identity write-gate posture (`MDL_AUTH_REQUIRE`) so
+  a shared deployment does not expose its own audit trail to any anonymous viewer.
+  `mdl audit tail`/`mdl audit grep` read the same file for the CLI.
+
+### 20.6 Privacy
+
+The record names an action and its target, never its contents: no definitions, no
+attribute values, no payloads. So the log says *"anita proposed on branch X, 3
+changes, route A, allowed"* — never *what* the new definition said. The what is in
+git, readable by whoever already has repo access; the audit trail answers *who/when/
+allowed?* for people who may not. This keeps it shareable with a compliance function
+(or a shared telemetry backend) without widening who can read the model's content.
+
+### 20.7 Explicitly deferred
+
+Log rotation/retention (hand off to `logrotate`, the OTLP collector, or the SIEM),
+cryptographic signing / hash-chaining of records, a hard "refuse writes when the audit
+sink is down" mode, OTel *traces/metrics* for Modelith beyond the audit logs signal,
+and any UI beyond the raw tail. Each is a real enterprise feature; none is needed for
+the trail to exist, be OTel-exportable, and be queryable — the M9 bar.
+
diff --git a/packages/server/pyproject.toml b/packages/server/pyproject.toml
index 16741de..e511d3a 100644
--- a/packages/server/pyproject.toml
+++ b/packages/server/pyproject.toml
@@ -13,6 +13,14 @@ dependencies = [
     "python-multipart>=0.0.18",
 ]
 
+[project.optional-dependencies]
+# OpenTelemetry export for the audit log (spec §20). Optional so the core CLI stays
+# dependency-light; without it, audit degrades to the local JSONL file writer alone.
+audit = [
+    "opentelemetry-sdk>=1.20",
+    "opentelemetry-exporter-otlp-proto-http>=1.20",
+]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
diff --git a/packages/server/src/mdl_server/app.py b/packages/server/src/mdl_server/app.py
index e0ab6cb..63a50a4 100644
--- a/packages/server/src/mdl_server/app.py
+++ b/packages/server/src/mdl_server/app.py
@@ -9,7 +9,7 @@
 
 from pathlib import Path
 
-from fastapi import FastAPI, HTTPException
+from fastapi import Depends, FastAPI, HTTPException, Request
 from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 
@@ -17,8 +17,15 @@
 from mdl_core.repo import ModelRepo
 from mdl_core.validate import validate
 from mdl_server import commands
+from mdl_server.audit import AuditSink
 from mdl_server.git_api import git_router
 from mdl_server.glossary_api import glossary_router, subject_area_router
+from mdl_server.identity import (
+    Identity,
+    IdentityPolicy,
+    resolve_identity,
+    write_denied_reason,
+)
 from mdl_server.ontology_api import ontology_router
 from mdl_server.projection import project
 
@@ -72,6 +79,29 @@ def create_app(
     app = FastAPI(title="Modelith", docs_url="/api/docs", openapi_url="/api/openapi.json")
     cache: dict = {"fingerprint": None, "repo": None}
 
+    # Identity is resolved per request from a trusted-proxy header (enterprise) or the
+    # model dir's git config (solo), or falls back to anonymous — see identity.py. The
+    # policy is read from the environment ONCE, here, so serve() and the CLI need no
+    # signature change. Nothing is trusted unless the operator opted in.
+    policy = IdentityPolicy.from_env()
+    if policy.misconfigured_secret():
+        import warnings
+
+        warnings.warn(
+            "MDL_AUTH_PROXY_SECRET_HEADER is set but MDL_AUTH_PROXY_SECRET is empty; "
+            "trusted-header auth is DISABLED (fail-closed). Set the secret value to "
+            "enable it.",
+            RuntimeWarning,
+            stacklevel=2,
+        )
+
+    def _identity(request: Request) -> Identity:
+        return resolve_identity(request.headers, policy, model_dir)
+
+    # Audit sink (spec §20): OTLP export when an OTEL endpoint is set, a local JSONL
+    # file when MDL_AUDIT_LOG is set, off when neither is. Resolved once; best-effort.
+    audit = AuditSink.from_env(resource_attrs={"mdl.model_dir": str(model_dir)})
+
     def _load() -> ModelRepo:
         try:
             fp = _dir_fingerprint(model_dir)
@@ -83,7 +113,9 @@ def _load() -> ModelRepo:
             raise HTTPException(status_code=404, detail=str(e)) from e
 
     @app.get("/api/model")
-    def get_model(subject_area: str = "") -> JSONResponse:
+    def get_model(
+        subject_area: str = "", ident: Identity = Depends(_identity)
+    ) -> JSONResponse:
         """`?subject_area=<ulid>` scopes the model to that area — which also gives
         the main canvas a subject-area filter, not just the SME workspace."""
         repo = _load()
@@ -93,6 +125,10 @@ def get_model(subject_area: str = "") -> JSONResponse:
         # Which persona this process is serving: staged edits that become a PR, or
         # direct writes to the working tree. The app reads it to pick its mode.
         doc["direct"] = direct
+        # Who the server thinks you are (spec §17). The Studio app reads this: when
+        # source != "anonymous" it greets you and stops asking for a name. Purely
+        # informational on a read — identity gates writes, never reads.
+        doc["identity"] = {"name": ident.name, "email": ident.email, "source": ident.source}
         doc["domains"] = sorted(d.name for d in repo.model.domains.values())
         return JSONResponse(doc)
 
@@ -146,6 +182,27 @@ def get_diagnostics() -> JSONResponse:
     def health() -> dict:
         return {"status": "ok", "model_dir": str(model_dir), "read_only": read_only}
 
+    # Audit read surface (spec §20.5). Admin-gated: a shared deployment must not
+    # expose its own audit trail to an anonymous viewer, so the identity write-gate
+    # posture applies here too. Returns a clean 404 (not the SPA page) when auditing
+    # is not configured.
+    @app.get("/api/audit")
+    def get_audit(
+        limit: int = 100,
+        op: str = "",
+        identity: str = "",
+        ident: Identity = Depends(_identity),
+    ) -> JSONResponse:
+        if not audit.enabled:
+            raise HTTPException(status_code=404, detail="auditing is not enabled")
+        denied = write_denied_reason(ident, policy)
+        if denied:
+            raise HTTPException(status_code=403, detail=denied)
+        records = audit.read(
+            limit=max(1, min(limit, 1000)), op=op or None, identity=identity or None
+        )
+        return JSONResponse({"ok": True, "count": len(records), "records": records})
+
     # Ontology + glossary read APIs — always available (read-only + edit modes).
     app.include_router(ontology_router(model_dir, lambda: _load().model, read_only=read_only))
     app.include_router(glossary_router(lambda: _load().model))
@@ -179,7 +236,16 @@ def decisions() -> JSONResponse:
     if not read_only:
 
         @app.post("/api/decisions/{signal_key}/verdict")
-        def set_verdict(signal_key: str, body: dict) -> JSONResponse:
+        def set_verdict(
+            signal_key: str, body: dict, ident: Identity = Depends(_identity)
+        ) -> JSONResponse:
+            denied = write_denied_reason(ident, policy)
+            if denied:
+                audit.record(
+                    "verdict", identity=ident.name or ident.email, source=ident.source,
+                    target=signal_key, outcome="denied", detail=denied,
+                )
+                raise HTTPException(status_code=403, detail=denied)
             from mdl_reverse.ledger import DecisionLedger, Verdict
 
             ledger = DecisionLedger.load(model_dir)
@@ -191,21 +257,33 @@ def set_verdict(signal_key: str, body: dict) -> JSONResponse:
                 raise HTTPException(status_code=422, detail="verdict: accepted|rejected") from e
             ledger.set_verdict(signal_key, verdict)
             ledger.save(model_dir)
+            audit.record(
+                "verdict", identity=ident.name or ident.email, source=ident.source,
+                target=signal_key, outcome="ok", detail=verdict.value,
+            )
             return JSONResponse({"ok": True})
 
         @app.post("/api/command")
-        def command(body: dict) -> JSONResponse:
+        def command(body: dict, ident: Identity = Depends(_identity)) -> JSONResponse:
+            denied = write_denied_reason(ident, policy)
             op = body.get("op", "")
+            _who = dict(identity=ident.name or ident.email, source=ident.source)
+            if denied:
+                audit.record("command", target=op, outcome="denied", detail=denied, **_who)
+                return JSONResponse({"ok": False, "error": denied}, status_code=403)
             payload = body.get("payload") or {}
             base_fp = body.get("fingerprint")
             try:
                 result = commands.apply_command(model_dir, op, payload, base_fp)
             except commands.StaleModelError as e:
+                audit.record("command", target=op, outcome="error", detail="stale model", **_who)
                 return JSONResponse({"ok": False, "error": str(e)}, status_code=409)
             except commands.CommandError as e:
+                audit.record("command", target=op, outcome="error", detail=str(e)[:200], **_who)
                 return JSONResponse({"ok": False, "error": str(e)}, status_code=422)
             cache["repo"] = None  # bust the model cache
             _cache_on_align(model_dir, op, payload)
+            audit.record("command", target=op, outcome="ok", **_who)
             return JSONResponse(
                 {
                     "ok": True,
@@ -219,7 +297,9 @@ def command(body: dict) -> JSONResponse:
     # classify, conflicts, context, proposals) must work under --read-only, which
     # is exactly the catalog-browse and "SME just looking" case. Writes are gated
     # inside the router.
-    app.include_router(git_router(model_dir, read_only=read_only))
+    app.include_router(
+        git_router(model_dir, read_only=read_only, identity_policy=policy, audit=audit)
+    )
 
     # Static canvas build. Mounted last so /api/* wins.
     if STATIC_DIR.exists():
diff --git a/packages/server/src/mdl_server/audit.py b/packages/server/src/mdl_server/audit.py
new file mode 100644
index 0000000..6a3c54f
--- /dev/null
+++ b/packages/server/src/mdl_server/audit.py
@@ -0,0 +1,279 @@
+"""Append-only audit log of write/administrative events (spec §20).
+
+Git records every *model* change. It does not record the *administrative* history a
+compliance reviewer asks for: who was let in, what a request tried to do and whether
+it was allowed or REFUSED (a denied write never becomes a commit, so git cannot show
+it), a decision verdict. That trail is this module's whole job.
+
+OpenTelemetry-native: an audit event is emitted once and each configured exporter
+receives it —
+
+  * OTLP (opentelemetry-exporter-otlp-proto-http) when the standard
+    OTEL_EXPORTER_OTLP_ENDPOINT / …_LOGS_ENDPOINT is set, so the trail lands in
+    whatever collector/SIEM the enterprise already runs (Splunk, Datadog, Grafana,
+    an OpenTelemetry Collector) with no Modelith-specific integration; and
+  * a local JSONL file when MDL_AUDIT_LOG is set — the always-available fallback and
+    the source for `GET /api/audit` and the CLI.
+
+Both are optional. With neither configured, audit is OFF (solo users get nothing to
+set up and no stray file). If the OTel packages are absent, audit degrades to the
+JSONL writer alone — never an import error. Export is best-effort and never fails a
+request: a full disk or an unreachable collector is logged to stderr, not surfaced.
+
+The record names an action and its target, never its contents (§20.6): no
+definitions, no attribute values, no payloads. The "what" is in git for whoever has
+repo access; the audit trail answers who/when/allowed for people who may not.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import sys
+import threading
+from collections.abc import Mapping
+from dataclasses import dataclass
+from datetime import UTC, datetime
+from pathlib import Path
+
+# env vars (Modelith-specific; OTLP uses the OTel spec's own OTEL_* vars)
+ENV_AUDIT_LOG = "MDL_AUDIT_LOG"
+ENV_OTLP_ENDPOINT = "OTEL_EXPORTER_OTLP_ENDPOINT"
+ENV_OTLP_LOGS_ENDPOINT = "OTEL_EXPORTER_OTLP_LOGS_ENDPOINT"
+
+_VALID_OUTCOMES = ("ok", "denied", "error")
+
+
+@dataclass(frozen=True)
+class AuditEvent:
+    ts: str  # UTC ISO-8601, ms precision
+    identity: str
+    source: str  # proxy | git | anonymous
+    op: str  # command | propose | commit | discard | verdict
+    target: str
+    outcome: str  # ok | denied | error
+    detail: str | None = None
+
+    def to_json(self) -> dict:
+        d = {
+            "ts": self.ts,
+            "identity": self.identity,
+            "source": self.source,
+            "op": self.op,
+            "target": self.target,
+            "outcome": self.outcome,
+        }
+        if self.detail:
+            d["detail"] = self.detail
+        return d
+
+
+def _now_iso() -> str:
+    return datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%S.") + (
+        f"{datetime.now(UTC).microsecond // 1000:03d}Z"
+    )
+
+
+class AuditSink:
+    """Resolved once at create_app time. Immutable configuration; the write lock
+    guards concurrent appends to the JSONL file (uvicorn serves handlers in a
+    threadpool)."""
+
+    def __init__(
+        self,
+        *,
+        log_path: Path | None,
+        otel_endpoint: str | None,
+        resource_attrs: Mapping[str, str] | None = None,
+    ) -> None:
+        self._log_path = log_path
+        self._lock = threading.Lock()
+        self._otel_logger = None  # lazily-built OTel logger, or None
+        if log_path is not None:
+            try:
+                log_path.parent.mkdir(parents=True, exist_ok=True)
+            except OSError as e:  # a bad path must not crash startup
+                print(f"[audit] cannot create {log_path.parent}: {e}", file=sys.stderr)
+                self._log_path = None
+        if otel_endpoint:
+            self._otel_logger = _try_build_otel_logger(resource_attrs or {})
+
+    @classmethod
+    def from_env(
+        cls,
+        env: Mapping[str, str] | None = None,
+        *,
+        resource_attrs: Mapping[str, str] | None = None,
+    ) -> AuditSink:
+        env = os.environ if env is None else env
+        raw = (env.get(ENV_AUDIT_LOG) or "").strip()
+        log_path = Path(raw).expanduser() if raw else None
+        endpoint = (
+            env.get(ENV_OTLP_LOGS_ENDPOINT) or env.get(ENV_OTLP_ENDPOINT) or ""
+        ).strip() or None
+        return cls(log_path=log_path, otel_endpoint=endpoint, resource_attrs=resource_attrs)
+
+    @property
+    def enabled(self) -> bool:
+        return self._log_path is not None or self._otel_logger is not None
+
+    @property
+    def log_path(self) -> Path | None:
+        return self._log_path
+
+    def record(
+        self,
+        op: str,
+        *,
+        identity: str,
+        source: str,
+        target: str,
+        outcome: str,
+        detail: str | None = None,
+    ) -> None:
+        """Emit one audit event to every configured exporter. Best-effort: any
+        failure is logged to stderr and swallowed, so an audit outage never takes
+        down a write."""
+        if not self.enabled:
+            return
+        if outcome not in _VALID_OUTCOMES:
+            outcome = "error"
+        ev = AuditEvent(
+            ts=_now_iso(),
+            identity=identity or "",
+            source=source or "anonymous",
+            op=op,
+            target=target or "",
+            outcome=outcome,
+            detail=detail,
+        )
+        if self._log_path is not None:
+            self._append_jsonl(ev)
+        if self._otel_logger is not None:
+            self._emit_otel(ev)
+
+    def _append_jsonl(self, ev: AuditEvent) -> None:
+        try:
+            line = json.dumps(ev.to_json(), separators=(",", ":"))
+            with self._lock, self._log_path.open("a", encoding="utf-8") as f:  # type: ignore[union-attr]
+                f.write(line + "\n")
+        except OSError as e:
+            print(f"[audit] append failed: {e}", file=sys.stderr)
+
+    def _emit_otel(self, ev: AuditEvent) -> None:
+        try:
+            _otel_emit(self._otel_logger, ev)
+        except Exception as e:  # noqa: BLE001 — telemetry must never break a write
+            print(f"[audit] otel emit failed: {e}", file=sys.stderr)
+
+    def read(
+        self, *, limit: int = 100, op: str | None = None, identity: str | None = None
+    ) -> list[dict]:
+        """Most recent records from the JSONL file (newest first), filterable. The
+        OTLP collector/SIEM is the real query surface when OTLP is on; this is the
+        local convenience for the endpoint and the CLI."""
+        if self._log_path is None or not self._log_path.exists():
+            return []
+        try:
+            lines = self._log_path.read_text(encoding="utf-8").splitlines()
+        except OSError:
+            return []
+        out: list[dict] = []
+        for ln in reversed(lines):
+            ln = ln.strip()
+            if not ln:
+                continue
+            try:
+                rec = json.loads(ln)
+            except json.JSONDecodeError:
+                continue
+            if op and rec.get("op") != op:
+                continue
+            if identity and rec.get("identity") != identity:
+                continue
+            out.append(rec)
+            if len(out) >= limit:
+                break
+        return out
+
+
+# --- OpenTelemetry, entirely optional --------------------------------------------
+#
+# Imported lazily and guarded so the absence of the packages degrades to JSONL-only
+# rather than raising. Kept in module-level helpers (not methods) so the SDK types
+# never appear in AuditSink's signatures.
+
+_OTEL_SEVERITY = {"ok": "INFO", "denied": "WARN", "error": "ERROR"}
+
+
+def _try_build_otel_logger(resource_attrs: Mapping[str, str]):
+    """Build an OTel logs LoggerProvider with an OTLP exporter, or return None if the
+    packages are not installed. The endpoint + headers + protocol come from the OTel
+    spec's own OTEL_EXPORTER_OTLP_* env vars, honoured by the exporter itself."""
+    try:
+        from opentelemetry.sdk._logs import LoggerProvider
+        from opentelemetry.sdk._logs.export import BatchLogRecordProcessor
+        from opentelemetry.sdk.resources import Resource
+
+        try:
+            from opentelemetry.exporter.otlp.proto.http._log_exporter import (
+                OTLPLogExporter,
+            )
+        except ImportError:  # grpc variant, if that is what is installed
+            from opentelemetry.exporter.otlp.proto.grpc._log_exporter import (  # type: ignore
+                OTLPLogExporter,
+            )
+    except ImportError:
+        print(
+            "[audit] OTEL endpoint set but opentelemetry packages are not installed; "
+            "install modelith[audit] for OTLP export. Falling back to the file sink.",
+            file=sys.stderr,
+        )
+        return None
+
+    attrs = {"service.name": "modelith", **dict(resource_attrs)}
+    provider = LoggerProvider(resource=Resource.create(attrs))
+    provider.add_log_record_processor(BatchLogRecordProcessor(OTLPLogExporter()))
+    return provider.get_logger("mdl.audit")
+
+
+def _otel_emit(logger, ev: AuditEvent) -> None:
+    """Emit one AuditEvent as an OTel LogRecord, stamped with the current trace
+    context when there is one."""
+    import time
+
+    from opentelemetry import trace
+    from opentelemetry._logs import SeverityNumber
+
+    # The LogRecord to emit lives in the API package (opentelemetry._logs) in current
+    # SDKs; older SDKs exposed it under opentelemetry.sdk._logs. Try both so a range
+    # of installed versions works.
+    try:
+        from opentelemetry._logs import LogRecord
+    except ImportError:  # pragma: no cover - very old SDKs
+        from opentelemetry.sdk._logs import LogRecord  # type: ignore
+
+    sev_name = _OTEL_SEVERITY.get(ev.outcome, "INFO")
+    sev_num = getattr(SeverityNumber, sev_name, SeverityNumber.INFO)
+    span = trace.get_current_span()
+    ctx = span.get_span_context() if span else None
+    attributes = {
+        "mdl.audit.identity": ev.identity,
+        "mdl.audit.source": ev.source,
+        "mdl.audit.op": ev.op,
+        "mdl.audit.target": ev.target,
+        "mdl.audit.outcome": ev.outcome,
+    }
+    if ev.detail:
+        attributes["mdl.audit.detail"] = ev.detail
+    record = LogRecord(
+        timestamp=time.time_ns(),
+        trace_id=ctx.trace_id if ctx and ctx.is_valid else 0,
+        span_id=ctx.span_id if ctx and ctx.is_valid else 0,
+        trace_flags=ctx.trace_flags if ctx and ctx.is_valid else None,
+        severity_text=sev_name,
+        severity_number=sev_num,
+        body="audit",
+        attributes=attributes,
+    )
+    logger.emit(record)
diff --git a/packages/server/src/mdl_server/git_api.py b/packages/server/src/mdl_server/git_api.py
index 26a6660..90f4dbf 100644
--- a/packages/server/src/mdl_server/git_api.py
+++ b/packages/server/src/mdl_server/git_api.py
@@ -13,11 +13,23 @@
 import subprocess
 from dataclasses import dataclass
 from pathlib import Path
+from typing import TYPE_CHECKING
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Depends, Request
 from fastapi.responses import JSONResponse
 from pydantic import BaseModel
 
+from mdl_server.identity import (
+    Identity,
+    IdentityPolicy,
+    effective_author,
+    resolve_identity,
+    write_denied_reason,
+)
+
+if TYPE_CHECKING:
+    from mdl_server.audit import AuditSink
+
 
 def _git(model_dir: Path, *args: str, timeout: int = 30) -> tuple[int, str]:
     proc = subprocess.run(
@@ -40,7 +52,11 @@ class ChangeOp(BaseModel):
 
 
 class ProposeBody(BaseModel):
-    user: str
+    # Optional: a proxy- or git-established identity (spec §17) overrides it, and it
+    # is only used as the author when nothing else is known (the anonymous fallback,
+    # today's zero-config behaviour). Kept so a solo user with no git config still
+    # gets attribution.
+    user: str = ""
     slug: str = ""
     title: str
     body: str = ""
@@ -52,6 +68,15 @@ def _slugify(s: str) -> str:
     return s or "change"
 
 
+def _branch_user(ident: Identity, client_user: str) -> str:
+    """The name that seeds the `sme/<slug>/` branch prefix. A trusted identity wins
+    over the query-string `user`, so "your proposals" filters by the real user rather
+    than a typed guess; otherwise fall back to the client string (today's behaviour)."""
+    if ident.is_trusted:
+        return ident.email or ident.name
+    return client_user
+
+
 # Mutation ops that write the catalog-owned meaning-fields. When the glossary's
 # source of truth is Collibra, /propose refuses these — the UI hides them, but the
 # server is the real boundary (a scripted client can't smuggle a definition edit in).
@@ -508,6 +533,41 @@ def _classify_response(model_dir: Path, base: str) -> dict:
     return cl
 
 
+def _classify_staged_response(model_dir: Path, changes: list[dict]) -> dict:
+    """Classify a STAGED change set (not yet on disk): preview it to learn which
+    model files it touches, then route those. This makes the route/reviewer panel
+    correct for a proposal before anything is written.
+
+    preview_changed_paths returns MODEL-DIR-relative paths (e.g.
+    'conceptual/entities/x.yaml'). classify_paths keys off a `<model_root>/conceptual/…`
+    shape, so we normalise every layout to a `model/` sentinel prefix and use its
+    default roots — that routes identically whether the model lives at the repo root,
+    under `model/`, or in a nested dir like `demo/ibor/model/`. (mdl-project.yaml lives
+    at the model-dir root and classify_paths matches it by suffix, so it passes through
+    un-prefixed.)"""
+    from mdl_core.repo import ModelRepo
+    from mdl_core.routes import classify_paths
+    from mdl_server.git_models import repo_prefix
+    from mdl_server.preview import preview_changed_paths
+
+    if not _is_repo(model_dir):
+        return {"ok": False, "error": "not a git repository", "git": False}
+
+    repo = ModelRepo.load(model_dir)
+    rel = preview_changed_paths(repo, changes)
+    sentinel = [p if p == "mdl-project.yaml" else f"model/{p}" for p in rel]
+    cl = classify_paths(sentinel).to_dict()
+    cl["ok"] = True
+    cl["paths"] = rel  # report the real model-relative paths, not the sentinel form
+    # CODEOWNERS matches on repo-root-relative paths, so prefix by the model dir's
+    # own location in the repo.
+    prefix = repo_prefix(model_dir).rstrip("/")
+    repo_paths = [f"{prefix}/{p}" if prefix else p for p in rel]
+    actual = _codeowners_reviewers(model_dir, repo_paths)
+    cl["reviewers_actual"] = actual or None
+    return cl
+
+
 def _conflicts_response(model_dir: Path, base: str) -> dict:
     """Dry-run the SAME semantic merge driver git would run, so the answer is not
     an approximation. merge_model_files is pure over three strings; nothing is
@@ -687,16 +747,41 @@ def _ahead_behind_branch(model_dir: Path, base: str, branch: str) -> tuple[int,
     return int(ahead), int(behind)
 
 
-def git_router(model_dir: Path, *, read_only: bool = False) -> APIRouter:
+def git_router(
+    model_dir: Path,
+    *,
+    read_only: bool = False,
+    identity_policy: IdentityPolicy | None = None,
+    audit: AuditSink | None = None,
+) -> APIRouter:
     """Git operations for the canvas and the SME app.
 
     READS are always registered — including under `mdl glossary --read-only`,
     which is exactly the "SME just looking" and catalog-browse case. The SME view
     has to be able to say which branch it is on and whether a proposal would
     merge cleanly, and a diff is a read. Only the mutating routes (commit,
-    discard, propose) sit behind `read_only`, matching ontology_router."""
+    discard, propose) sit behind `read_only`, matching ontology_router.
+
+    `identity_policy` (spec §17) decides how the acting user is established for the
+    propose author and the "your proposals" branch prefix. None means the solo
+    default (git config / anonymous), which is what stand-alone callers and the
+    existing tests get."""
     router = APIRouter(prefix="/api/git")
     model_dir = Path(model_dir).resolve()
+    policy = identity_policy if identity_policy is not None else IdentityPolicy.from_env({})
+    if audit is None:
+        from mdl_server.audit import AuditSink
+
+        audit = AuditSink(log_path=None, otel_endpoint=None)  # a disabled no-op sink
+
+    def _identity(request: Request) -> Identity:
+        return resolve_identity(request.headers, policy, model_dir)
+
+    def _audit(op: str, ident: Identity, target: str, outcome: str, detail: str | None = None):
+        audit.record(
+            op, identity=ident.name or ident.email, source=ident.source,
+            target=target, outcome=outcome, detail=detail,
+        )
 
     @router.get("/status")
     def status() -> JSONResponse:
@@ -752,6 +837,16 @@ def classify(base: str = "HEAD") -> JSONResponse:
         """Which review route the change takes, who reviews it, which gates run."""
         return JSONResponse(_classify_response(model_dir, base))
 
+    @router.post("/classify")
+    def classify_staged(body: dict) -> JSONResponse:
+        """Route a STAGED proposal (not yet on disk): the same route/reviewer/gate
+        answer as GET, but for the change set the modeler app holds in its tray.
+        Writes nothing — the preview runs against a throwaway copy."""
+        changes = body.get("changes") or []
+        if not isinstance(changes, list):
+            return JSONResponse({"ok": False, "error": "changes must be a list"}, status_code=422)
+        return JSONResponse(_classify_staged_response(model_dir, changes))
+
     @router.get("/conflicts")
     def conflicts(base: str = "main") -> JSONResponse:
         """Would this merge cleanly onto `base`? A dry run of the real merge
@@ -759,43 +854,71 @@ def conflicts(base: str = "main") -> JSONResponse:
         return JSONResponse(_conflicts_response(model_dir, base))
 
     @router.get("/context")
-    def context(user: str = "") -> JSONResponse:
+    def context(user: str = "", ident: Identity = Depends(_identity)) -> JSONResponse:
         """Everything the SME view's git banner needs, in one call."""
-        return JSONResponse(_context_response(model_dir, user, read_only=read_only))
+        return JSONResponse(
+            _context_response(model_dir, _branch_user(ident, user), read_only=read_only)
+        )
 
     @router.get("/proposals")
-    def proposals(user: str = "") -> JSONResponse:
+    def proposals(user: str = "", ident: Identity = Depends(_identity)) -> JSONResponse:
         """Open proposal branches with their state. Everything except the PR row
         is derived from plain git, so the list is never empty without `gh`."""
-        return JSONResponse(_proposals_response(model_dir, user))
+        return JSONResponse(_proposals_response(model_dir, _branch_user(ident, user)))
 
     if not read_only:
 
         @router.post("/commit")
-        def commit(body: CommitBody) -> JSONResponse:
+        def commit(body: CommitBody, ident: Identity = Depends(_identity)) -> JSONResponse:
+            denied = write_denied_reason(ident, policy)
+            if denied:
+                _audit("commit", ident, "HEAD", "denied", denied)
+                return JSONResponse({"ok": False, "error": denied}, status_code=403)
             code, out = _git(model_dir, "add", "--", ".")
             if code != 0:
+                _audit("commit", ident, "HEAD", "error", "git add failed")
                 return JSONResponse({"ok": False, "error": out}, status_code=500)
             msg = body.message.strip() or "canvas edits"
             code, out = _git(model_dir, "commit", "-m", msg, "--", ".")
             if code != 0:
+                _audit("commit", ident, "HEAD", "error", "git commit failed")
                 return JSONResponse({"ok": False, "error": out}, status_code=409)
             _, sha = _git(model_dir, "rev-parse", "--short", "HEAD")
+            _audit("commit", ident, sha, "ok")
             return JSONResponse({"ok": True, "sha": sha})
 
         @router.post("/discard")
-        def discard() -> JSONResponse:
+        def discard(ident: Identity = Depends(_identity)) -> JSONResponse:
+            denied = write_denied_reason(ident, policy)
+            if denied:
+                _audit("discard", ident, "working-tree", "denied", denied)
+                return JSONResponse({"ok": False, "error": denied}, status_code=403)
             # revert tracked edits + remove untracked files, model dir only
             code1, out1 = _git(model_dir, "checkout", "--", ".")
             code2, out2 = _git(model_dir, "clean", "-fd", "--", ".")
             ok = code1 == 0 and code2 == 0
+            _audit("discard", ident, "working-tree", "ok" if ok else "error")
             return JSONResponse({"ok": ok, "error": None if ok else f"{out1}\n{out2}"})
 
         @router.post("/propose")
-        def propose(body: ProposeBody) -> JSONResponse:
+        def propose(
+            body: ProposeBody, ident: Identity = Depends(_identity)
+        ) -> JSONResponse:
             """The SME PR flow (§5.1), atomic: branch -> apply commands through the
             shared mutation engine -> commit with Co-authored-by -> push -> open a PR.
-            Degrades gracefully with no remote / no gh so the SME always gets a result."""
+            Degrades gracefully with no remote / no gh so the SME always gets a result.
+
+            The commit author is the SERVER-resolved identity (spec §17): a
+            proxy-authenticated user or the git config identity OVERRIDES the
+            self-asserted body.user, so the attribution is trustworthy. Only when
+            nothing is established (anonymous) do we fall back to body.user."""
+            # Shared-server gate (spec §18 M8): when the operator requires an
+            # authenticated identity, an anonymous proposer is refused rather than
+            # committing under a self-asserted name. Checked first, before any work.
+            denied = write_denied_reason(ident, policy)
+            if denied:
+                _audit("propose", ident, "-", "denied", denied)
+                return JSONResponse({"ok": False, "error": denied}, status_code=403)
             # The server is the real boundary, not the UI: reject anything outside
             # the allow-list BEFORE branching, so a refused proposal leaves no stray
             # branch behind.
@@ -805,6 +928,10 @@ def propose(body: ProposeBody) -> JSONResponse:
                     f"{op}: {_NOT_PROPOSABLE_REASON.get(op, 'not allowed in a proposal')}"
                     for op in rejected
                 ]
+                _audit(
+                    "propose", ident, ",".join(rejected), "denied",
+                    "op not proposable",
+                )
                 return JSONResponse(
                     {
                         "ok": False,
@@ -844,8 +971,13 @@ def propose(body: ProposeBody) -> JSONResponse:
                     status_code=409,
                 )
 
+            # The effective author drives BOTH the branch prefix and the commit
+            # trailer, so the two never disagree.
+            author = effective_author(ident, body.user)
+            author_key = author.email or author.name or "you"
+
             slug = _slugify(body.slug or body.title)
-            branch_name = f"sme/{_slugify(body.user)}/{slug}"
+            branch_name = f"sme/{_slugify(author_key)}/{slug}"
             # Remember where we started. Without this the server is left sitting on
             # the SME branch: the next SME browses an un-merged proposal as if it
             # were truth, and a second propose branches off the first, stacking
@@ -875,8 +1007,9 @@ def propose(body: ProposeBody) -> JSONResponse:
 
             _git(model_dir, "add", "--", ".")
             message = body.body.strip() or body.title.strip()
-            email = f"{_slugify(body.user)}@users.noreply.github.com"
-            message += f"\n\nCo-authored-by: {body.user} <{email}>"
+            if author.source != "anonymous" or author.name:
+                trailer_name = author.name or author_key
+                message += f"\n\nCo-authored-by: {trailer_name} <{author.email}>"
             code, out = _git(model_dir, "commit", "-m", message, "--", ".")
             if code != 0:
                 return JSONResponse({"ok": False, "error": out}, status_code=409)
@@ -887,6 +1020,10 @@ def _finish(payload: dict) -> JSONResponse:
                 goes back, so the next reader sees the base branch."""
                 _git(model_dir, "checkout", starting_branch)
                 payload["returned_to"] = starting_branch
+                _audit(
+                    "propose", ident, branch_name, "ok",
+                    f"{applied} change(s), pushed={payload.get('pushed')}",
+                )
                 return JSONResponse(payload)
 
             result: dict = {"ok": True, "branch": branch_name, "applied": applied}
diff --git a/packages/server/src/mdl_server/identity.py b/packages/server/src/mdl_server/identity.py
new file mode 100644
index 0000000..1a9ab37
--- /dev/null
+++ b/packages/server/src/mdl_server/identity.py
@@ -0,0 +1,241 @@
+"""Who is this request from? — a thin, IdP-agnostic identity seam (spec §17).
+
+Two personas, one rule each:
+
+  solo       Nobody logs in. The acting user is whoever the model dir's git config
+             says — exactly like a normal `git commit`. Zero configuration, zero
+             friction. This is the default and needs nothing set up.
+
+  enterprise A reverse proxy (oauth2-proxy, Pomerium, cloudflared, nginx
+             auth_request, Azure App Proxy, …) authenticates against the org IdP —
+             OIDC, SAML, whatever — and injects an identity header. Modelith trusts
+             THAT header and implements no OAuth/OIDC/SAML flow of its own, so every
+             IdP "just works" without Modelith owning redirect URIs, client secrets,
+             token validation, or four provider code paths.
+
+Safe by default: a raw request header is NEVER trusted unless the operator explicitly
+named it via MDL_AUTH_TRUSTED_USER_HEADER. An app accidentally exposed to the internet
+with no config will not honour a client-supplied X-Forwarded-User — it resolves to the
+server's git identity, or to anonymous. Trusted-header auth is only sound when the app
+is not directly reachable and only the proxy can reach it (bind to localhost / a
+private network; the proxy terminates public traffic). Modelith cannot verify network
+topology, so it documents the contract and fails closed.
+
+Identity is a WRITE-time concern: it decides who a proposal is attributed to. It never
+gates a read, and it is not authorization — who may MERGE stays with git (branch
+protection + CODEOWNERS).
+"""
+
+from __future__ import annotations
+
+import hmac
+import os
+import subprocess
+from collections.abc import Mapping
+from dataclasses import dataclass
+from pathlib import Path
+
+# Env var names, namespaced MDL_AUTH_* (see spec §17.2).
+ENV_USER_HEADER = "MDL_AUTH_TRUSTED_USER_HEADER"
+ENV_NAME_HEADER = "MDL_AUTH_TRUSTED_NAME_HEADER"
+ENV_SECRET_HEADER = "MDL_AUTH_PROXY_SECRET_HEADER"
+ENV_SECRET_VALUE = "MDL_AUTH_PROXY_SECRET"
+ENV_REQUIRE = "MDL_AUTH_REQUIRE"
+
+# Values that turn the write gate ON (case-insensitive). Anything else — including
+# unset — leaves it off, so solo stays frictionless.
+_TRUTHY = {"1", "true", "yes", "on", "require"}
+
+
+@dataclass(frozen=True)
+class Identity:
+    """The resolved actor. `source` records HOW we know who this is, so the propose
+    flow can decide whether to trust it over a self-asserted client string."""
+
+    name: str  # display / Co-authored-by name, e.g. "Anita Hough"
+    email: str  # for the git author/trailer; may be synthesized from the name
+    source: str  # "proxy" | "git" | "anonymous"
+
+    @property
+    def is_trusted(self) -> bool:
+        """A proxy- or git-established identity outranks anything the client sends."""
+        return self.source in ("proxy", "git")
+
+
+ANONYMOUS = Identity(name="", email="", source="anonymous")
+
+
+@dataclass(frozen=True)
+class IdentityPolicy:
+    """Resolved ONCE at create_app time from the environment, then immutable. The
+    presence of a trusted user header is the master switch for header auth."""
+
+    trusted_user_header: str | None
+    trusted_name_header: str | None
+    trusted_secret_header: str | None
+    trusted_secret_value: str | None
+    # When True, a write by an anonymous (unestablished) identity is refused with 403
+    # rather than falling back to a self-asserted author. For shared/enterprise
+    # deployments that want to hard-fail instead of silently accepting "you". Off by
+    # default, so a solo user with no git identity is never blocked from proposing.
+    require_identity: bool
+
+    @classmethod
+    def from_env(cls, env: Mapping[str, str] | None = None) -> IdentityPolicy:
+        env = os.environ if env is None else env
+        user_header = (env.get(ENV_USER_HEADER) or "").strip() or None
+        name_header = (env.get(ENV_NAME_HEADER) or "").strip() or None
+        secret_header = (env.get(ENV_SECRET_HEADER) or "").strip() or None
+        secret_value = env.get(ENV_SECRET_VALUE) or None
+        require = (env.get(ENV_REQUIRE) or "").strip().lower() in _TRUTHY
+
+        # Fail closed: a configured secret GATE with no secret VALUE to check against
+        # would trust the user header on nothing more than "a header named X exists".
+        # Rather than trust it, disable header auth entirely and let the caller warn.
+        if secret_header and not secret_value:
+            user_header = None
+            name_header = None
+            secret_header = None
+            secret_value = None
+
+        return cls(
+            trusted_user_header=user_header,
+            trusted_name_header=name_header,
+            trusted_secret_header=secret_header,
+            trusted_secret_value=secret_value,
+            require_identity=require,
+        )
+
+    @property
+    def header_auth_enabled(self) -> bool:
+        return bool(self.trusted_user_header)
+
+    def misconfigured_secret(self, env: Mapping[str, str] | None = None) -> bool:
+        """True when the operator set a secret HEADER but no secret VALUE — the
+        fail-closed case from_env swallowed. Surfaced only so create_app can log a
+        one-line startup warning; resolution itself is already safe."""
+        env = os.environ if env is None else env
+        return bool((env.get(ENV_SECRET_HEADER) or "").strip()) and not (
+            env.get(ENV_SECRET_VALUE) or None
+        )
+
+
+def _name_from_email(email: str) -> str:
+    """Best-effort display name from an email local-part: "anita.hough@corp.com"
+    -> "Anita Hough". Falls back to the whole string when there is no local-part."""
+    local = email.split("@", 1)[0] if "@" in email else email
+    parts = [p for p in local.replace("_", ".").replace("-", ".").split(".") if p]
+    return " ".join(p.capitalize() for p in parts) if parts else email
+
+
+def _from_trusted_header(headers: Mapping[str, str], policy: IdentityPolicy) -> Identity | None:
+    """The proxy path. Returns None (never raises) unless header auth is on, the
+    optional shared secret matches, and a non-empty user header is present."""
+    if not policy.header_auth_enabled:
+        return None
+
+    # Prove the request came THROUGH the proxy, not from a client spoofing the user
+    # header directly. Constant-time compare so a timing side-channel can't probe it.
+    if policy.trusted_secret_header:
+        presented = headers.get(policy.trusted_secret_header, "")
+        if not hmac.compare_digest(presented, policy.trusted_secret_value or ""):
+            return None
+
+    assert policy.trusted_user_header is not None  # header_auth_enabled guarantees it
+    user = (headers.get(policy.trusted_user_header) or "").strip()
+    if not user:
+        return None
+
+    name = ""
+    if policy.trusted_name_header:
+        name = (headers.get(policy.trusted_name_header) or "").strip()
+    email = user if "@" in user else ""
+    if not name:
+        name = _name_from_email(user) if email else user
+    if not email:
+        # A bare user id with no name header: synthesize a noreply address so the
+        # commit trailer is still well-formed.
+        email = f"{user}@users.noreply"
+    return Identity(name=name, email=email, source="proxy")
+
+
+def _from_git_config(model_dir: Path) -> Identity | None:
+    """The solo path: whoever this laptop's git config says. None if git config is
+    empty (or git is absent) — then we degrade to anonymous."""
+
+    def _cfg(key: str) -> str:
+        try:
+            proc = subprocess.run(
+                ["git", "-C", str(model_dir), "config", key],
+                capture_output=True,
+                text=True,
+                timeout=5,
+            )
+        except (subprocess.SubprocessError, OSError):
+            return ""
+        return proc.stdout.strip() if proc.returncode == 0 else ""
+
+    name = _cfg("user.name")
+    email = _cfg("user.email")
+    if not name and not email:
+        return None
+    if not name:
+        name = _name_from_email(email)
+    if not email:
+        email = "unknown@users.noreply"
+    return Identity(name=name, email=email, source="git")
+
+
+def resolve_identity(
+    headers: Mapping[str, str], policy: IdentityPolicy, model_dir: Path
+) -> Identity:
+    """Trusted header (only if opted in) -> git config -> anonymous.
+
+    A missing/blank trusted header when header auth is on is not an error: it means
+    "the proxy did not authenticate this request", and we fall through to git/anonymous
+    rather than trusting anything raw."""
+    ident = _from_trusted_header(headers, policy)
+    if ident is not None:
+        return ident
+    ident = _from_git_config(model_dir)
+    if ident is not None:
+        return ident
+    return ANONYMOUS
+
+
+def effective_author(ident: Identity, client_user: str) -> Identity:
+    """Who a proposal is attributed to.
+
+    A trusted identity (proxy or git) WINS over the self-asserted client string —
+    that is the whole point: the commit author becomes trustworthy. Only when nothing
+    is established (anonymous) do we fall back to the client-supplied name, preserving
+    today's zero-config behaviour so nothing regresses."""
+    if ident.is_trusted:
+        return ident
+    user = (client_user or "").strip()
+    if not user:
+        return ANONYMOUS
+    email = user if "@" in user else f"{_slug(user)}@users.noreply.github.com"
+    name = user if "@" not in user else _name_from_email(user)
+    return Identity(name=name, email=email, source="anonymous")
+
+
+def write_denied_reason(ident: Identity, policy: IdentityPolicy) -> str | None:
+    """When a write should be refused, the message to return (403); otherwise None.
+
+    Only fires when the operator set MDL_AUTH_REQUIRE and the request has no
+    established identity — the shared-server "no anonymous writes" gate. A trusted
+    proxy/git identity always passes; an unconfigured (solo) server always passes."""
+    if policy.require_identity and not ident.is_trusted:
+        return (
+            "this deployment requires an authenticated identity to make changes "
+            "(MDL_AUTH_REQUIRE is set) and none was established for this request"
+        )
+    return None
+
+
+def _slug(s: str) -> str:
+    import re
+
+    s = re.sub(r"[^a-z0-9]+", "-", s.strip().lower()).strip("-")
+    return s or "change"
diff --git a/packages/server/src/mdl_server/preview.py b/packages/server/src/mdl_server/preview.py
index 3a2308d..337921e 100644
--- a/packages/server/src/mdl_server/preview.py
+++ b/packages/server/src/mdl_server/preview.py
@@ -27,6 +27,51 @@
 from mdl_server.projection import project
 
 
+def preview_changed_paths(repo: ModelRepo, changes: list[dict]) -> list[str]:
+    """The model-dir-relative YAML paths the staged `changes` would add, modify, or
+    remove — computed by projecting the change set to a throwaway tree and comparing
+    it file-by-file against the on-disk model. Used to classify the review ROUTE of a
+    staged proposal (which files it touches → which reviewers/gates), the same way
+    `git diff --name-only` does for an already-written change.
+
+    Returns paths relative to the model dir (e.g. "conceptual/entities/x.yaml"); the
+    caller prefixes them to repo-root-relative for classification."""
+    scratch = copy.deepcopy(repo)
+    disk_root = Path(repo.root)
+    tmp = Path(tempfile.mkdtemp(prefix="mdl-preview-paths-"))
+    try:
+        scratch.root = tmp
+        for change in changes:
+            handler = _HANDLERS.get(change.get("op", ""))
+            if handler is None:
+                continue
+            try:
+                handler(scratch, change.get("payload") or {})
+            except CommandError:
+                # a bad op contributes no reliable paths; skip it, keep the rest
+                continue
+            scratch.save()
+            scratch = ModelRepo.load(tmp)
+        scratch.save()
+
+        def _yaml_bytes(root: Path) -> dict[str, bytes]:
+            out: dict[str, bytes] = {}
+            for p in root.rglob("*.yaml"):
+                out[str(p.relative_to(root))] = p.read_bytes()
+            return out
+
+        before = _yaml_bytes(disk_root)
+        after = _yaml_bytes(tmp)
+        changed = {
+            rel
+            for rel in before.keys() | after.keys()
+            if before.get(rel) != after.get(rel)
+        }
+        return sorted(changed)
+    finally:
+        shutil.rmtree(tmp, ignore_errors=True)
+
+
 def preview_model(
     repo: ModelRepo, changes: list[dict], *, subject_area: str | None = None
 ) -> dict[str, Any]:
diff --git a/packages/server/src/mdl_server/static/assets/ModelDiagram-3kXqE5bt.js b/packages/server/src/mdl_server/static/assets/ModelDiagram-DmGsnZ_X.js
similarity index 95%
rename from packages/server/src/mdl_server/static/assets/ModelDiagram-3kXqE5bt.js
rename to packages/server/src/mdl_server/static/assets/ModelDiagram-DmGsnZ_X.js
index b58f7ea..42de4be 100644
--- a/packages/server/src/mdl_server/static/assets/ModelDiagram-3kXqE5bt.js
+++ b/packages/server/src/mdl_server/static/assets/ModelDiagram-DmGsnZ_X.js
@@ -1 +1 @@
-import{r,j as s}from"./client-DOmNpTln.js";import{f as T,q as _,r as O,t as R,E as D,B as P,C as z,u as A}from"./styles-BvUlSDpb.js";const V={entity:D},$={relationship:R},l={breaking:"#f87171",additive:"#34d399",cosmetic:"#fcd34d"},N=["#5eead4","#fcd34d","#a78bfa","#fb923c","#38bdf8","#f472b6","#a3e635"],d="#64748b";function Y({subjectArea:u,severityByUlid:a,focusUlid:m,onSelect:c}){const[t,g]=r.useState(null),[f,E]=r.useState(null),[h,w]=r.useState(!0);r.useEffect(()=>{g(null),T(u).then(g).catch(n=>E(String(n)))},[u]);const{nodes:k,edges:M}=r.useMemo(()=>{if(!t)return{nodes:[],edges:[]};const n=new Map;t.subject_areas.forEach(e=>{let o=2166136261;for(let i=0;i<e.id.length;i++)o=Math.imul(o^e.id.charCodeAt(i),16777619);n.set(e.id,N[Math.abs(o)%N.length])});const p=new Map(t.entities.map(e=>[e.id,e])),b=a&&a.size>0,C=t.entities.map(e=>{var j;const o=(a==null?void 0:a.get(e.id))??(e.conceptual?a==null?void 0:a.get(e.conceptual.id):void 0),i=b?o?l[o]??d:d:(j=e.conceptual)!=null&&j.subject_area?n.get(e.conceptual.subject_area.id)??d:d;return{id:e.id,type:"entity",position:{x:0,y:0},data:{entity:e,color:i,dimmed:!!(b&&!o),highlighted:e.id===m,showTypes:h}}}),x=t.relationships.map(e=>({id:e.id,source:e.from.entity,target:e.to.entity,type:"relationship",data:{relationship:e,dimmed:!1}}));return{nodes:_(C,x,p),edges:x}},[t,a,m,h]);return f?s.jsx("p",{className:"sme-splash error",children:f}):t?t.entities.length?s.jsxs("div",{className:"erd-wrap",children:[s.jsxs("div",{className:"erd-bar",children:[s.jsxs("span",{className:"erd-count",children:[t.entities.length," entities · ",t.relationships.length," relationships",t.scope&&" · scoped"]}),s.jsxs("label",{className:"erd-toggle",children:[s.jsx("input",{type:"checkbox",checked:h,onChange:n=>w(n.target.checked)}),"show types"]}),a&&a.size>0&&s.jsxs("span",{className:"erd-legend",children:[s.jsx("span",{className:"sw",style:{background:l.breaking}})," breaking",s.jsx("span",{className:"sw",style:{background:l.additive}})," added",s.jsx("span",{className:"sw",style:{background:l.cosmetic}})," changed",s.jsx("span",{className:"sw",style:{background:d}})," unchanged"]})]}),s.jsx("div",{className:"erd-canvas",children:s.jsxs(O,{nodes:k,edges:M,nodeTypes:V,edgeTypes:$,fitView:!0,minZoom:.1,nodesConnectable:!1,onNodeClick:(n,p)=>c==null?void 0:c(p.id),onPaneClick:()=>c==null?void 0:c(null),onlyRenderVisibleElements:!0,proOptions:{hideAttribution:!0},children:[s.jsx(P,{gap:16,color:"#1f2937"}),s.jsx(z,{showInteractive:!1}),s.jsx(A,{pannable:!0,zoomable:!0})]})})]}):s.jsx("p",{className:"sme-placeholder",children:"Nothing to draw — this subject area has no entities in it yet."}):s.jsx("div",{className:"sme-splash",children:"◮ drawing the model…"})}export{Y as ModelDiagram};
+import{r,j as s}from"./client-DOmNpTln.js";import{f as T,r as _,t as O,u as R,E as D,B as P,C as z,v as A}from"./styles-Cp8yHIFV.js";const V={entity:D},$={relationship:R},l={breaking:"#f87171",additive:"#34d399",cosmetic:"#fcd34d"},N=["#5eead4","#fcd34d","#a78bfa","#fb923c","#38bdf8","#f472b6","#a3e635"],d="#64748b";function Y({subjectArea:u,severityByUlid:a,focusUlid:m,onSelect:c}){const[t,g]=r.useState(null),[f,E]=r.useState(null),[h,w]=r.useState(!0);r.useEffect(()=>{g(null),T(u).then(g).catch(n=>E(String(n)))},[u]);const{nodes:k,edges:M}=r.useMemo(()=>{if(!t)return{nodes:[],edges:[]};const n=new Map;t.subject_areas.forEach(e=>{let o=2166136261;for(let i=0;i<e.id.length;i++)o=Math.imul(o^e.id.charCodeAt(i),16777619);n.set(e.id,N[Math.abs(o)%N.length])});const p=new Map(t.entities.map(e=>[e.id,e])),b=a&&a.size>0,C=t.entities.map(e=>{var j;const o=(a==null?void 0:a.get(e.id))??(e.conceptual?a==null?void 0:a.get(e.conceptual.id):void 0),i=b?o?l[o]??d:d:(j=e.conceptual)!=null&&j.subject_area?n.get(e.conceptual.subject_area.id)??d:d;return{id:e.id,type:"entity",position:{x:0,y:0},data:{entity:e,color:i,dimmed:!!(b&&!o),highlighted:e.id===m,showTypes:h}}}),x=t.relationships.map(e=>({id:e.id,source:e.from.entity,target:e.to.entity,type:"relationship",data:{relationship:e,dimmed:!1}}));return{nodes:_(C,x,p),edges:x}},[t,a,m,h]);return f?s.jsx("p",{className:"sme-splash error",children:f}):t?t.entities.length?s.jsxs("div",{className:"erd-wrap",children:[s.jsxs("div",{className:"erd-bar",children:[s.jsxs("span",{className:"erd-count",children:[t.entities.length," entities · ",t.relationships.length," relationships",t.scope&&" · scoped"]}),s.jsxs("label",{className:"erd-toggle",children:[s.jsx("input",{type:"checkbox",checked:h,onChange:n=>w(n.target.checked)}),"show types"]}),a&&a.size>0&&s.jsxs("span",{className:"erd-legend",children:[s.jsx("span",{className:"sw",style:{background:l.breaking}})," breaking",s.jsx("span",{className:"sw",style:{background:l.additive}})," added",s.jsx("span",{className:"sw",style:{background:l.cosmetic}})," changed",s.jsx("span",{className:"sw",style:{background:d}})," unchanged"]})]}),s.jsx("div",{className:"erd-canvas",children:s.jsxs(O,{nodes:k,edges:M,nodeTypes:V,edgeTypes:$,fitView:!0,minZoom:.1,nodesConnectable:!1,onNodeClick:(n,p)=>c==null?void 0:c(p.id),onPaneClick:()=>c==null?void 0:c(null),onlyRenderVisibleElements:!0,proOptions:{hideAttribution:!0},children:[s.jsx(P,{gap:16,color:"#1f2937"}),s.jsx(z,{showInteractive:!1}),s.jsx(A,{pannable:!0,zoomable:!0})]})})]}):s.jsx("p",{className:"sme-placeholder",children:"Nothing to draw — this subject area has no entities in it yet."}):s.jsx("div",{className:"sme-splash",children:"◮ drawing the model…"})}export{Y as ModelDiagram};
diff --git a/packages/server/src/mdl_server/static/assets/main-BHA5ri5a.js b/packages/server/src/mdl_server/static/assets/main-DKFrx98H.js
similarity index 98%
rename from packages/server/src/mdl_server/static/assets/main-BHA5ri5a.js
rename to packages/server/src/mdl_server/static/assets/main-DKFrx98H.js
index a6709e0..337c399 100644
--- a/packages/server/src/mdl_server/static/assets/main-BHA5ri5a.js
+++ b/packages/server/src/mdl_server/static/assets/main-DKFrx98H.js
@@ -1,2 +1,2 @@
-import{j as t,r as a,c as _,R as V}from"./client-DOmNpTln.js";import{R as X,P as D,f as F,a as B,g as K,s as z,A as G,M as H,S as J}from"./styles-BvUlSDpb.js";function W(n){return{canEdit:!n,mode:"direct",canArbitrate:!n,canCommit:!n}}function Y({doc:n,diagnostics:o,query:T,onQuery:m,onSubmitQuery:b,showTypes:R,onToggleTypes:f,onFitView:p,onRelayout:y,onRefresh:v,saColors:N,readOnly:C,dirty:S,panelTab:k,onPanelTab:j,onNewEntity:x}){const w=(o==null?void 0:o.items.filter(l=>l.severity==="error").length)??0,u=(o==null?void 0:o.items.filter(l=>l.severity==="warning").length)??0,g=(l,i,M,d)=>t.jsx("button",{className:"tool-btn"+(k===l?" active":"")+(d?" badged":""),onClick:()=>j(l),title:M,children:i});return t.jsxs("header",{className:"topbar",children:[t.jsxs("div",{className:"brand",children:[t.jsx("span",{className:"logo",children:"◮"}),t.jsx("span",{className:"brand-name",children:"Modelith"}),t.jsx("span",{className:"project-name",children:n.project.name}),C&&t.jsx("span",{className:"chip",children:"read-only"})]}),t.jsx("input",{className:"search",type:"search",placeholder:"Search entities & attributes…  ( / , Enter jumps )",value:T,onChange:l=>m(l.target.value),onKeyDown:l=>{l.key==="Enter"&&b()},id:"mdl-search"}),t.jsx("div",{className:"legend",children:n.subject_areas.map(l=>t.jsxs("span",{className:"legend-item",children:[t.jsx("span",{className:"swatch",style:{background:N.get(l.id)}}),l.name]},l.id))}),t.jsxs("div",{className:"stats",children:[t.jsxs("span",{title:"entities",children:[n.counts.entities," ⬛"]}),t.jsxs("span",{title:"relationships",children:[n.counts.relationships," ⤳"]}),o&&t.jsx("span",{className:"diag-chip"+(w?" err":u?" warn":" ok"),title:o.items.map(l=>`${l.code} ${l.message}`).join(`
+import{j as t,r as a,c as _,R as V}from"./client-DOmNpTln.js";import{R as X,P as D,f as F,a as B,g as K,s as z,A as G,M as H,S as J}from"./styles-Cp8yHIFV.js";function W(n){return{canEdit:!n,mode:"direct",canArbitrate:!n,canCommit:!n}}function Y({doc:n,diagnostics:o,query:T,onQuery:m,onSubmitQuery:b,showTypes:R,onToggleTypes:f,onFitView:p,onRelayout:y,onRefresh:v,saColors:N,readOnly:C,dirty:S,panelTab:k,onPanelTab:j,onNewEntity:x}){const w=(o==null?void 0:o.items.filter(l=>l.severity==="error").length)??0,u=(o==null?void 0:o.items.filter(l=>l.severity==="warning").length)??0,g=(l,i,M,d)=>t.jsx("button",{className:"tool-btn"+(k===l?" active":"")+(d?" badged":""),onClick:()=>j(l),title:M,children:i});return t.jsxs("header",{className:"topbar",children:[t.jsxs("div",{className:"brand",children:[t.jsx("span",{className:"logo",children:"◮"}),t.jsx("span",{className:"brand-name",children:"Modelith"}),t.jsx("span",{className:"project-name",children:n.project.name}),C&&t.jsx("span",{className:"chip",children:"read-only"})]}),t.jsx("input",{className:"search",type:"search",placeholder:"Search entities & attributes…  ( / , Enter jumps )",value:T,onChange:l=>m(l.target.value),onKeyDown:l=>{l.key==="Enter"&&b()},id:"mdl-search"}),t.jsx("div",{className:"legend",children:n.subject_areas.map(l=>t.jsxs("span",{className:"legend-item",children:[t.jsx("span",{className:"swatch",style:{background:N.get(l.id)}}),l.name]},l.id))}),t.jsxs("div",{className:"stats",children:[t.jsxs("span",{title:"entities",children:[n.counts.entities," ⬛"]}),t.jsxs("span",{title:"relationships",children:[n.counts.relationships," ⤳"]}),o&&t.jsx("span",{className:"diag-chip"+(w?" err":u?" warn":" ok"),title:o.items.map(l=>`${l.code} ${l.message}`).join(`
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diff --git a/packages/server/src/mdl_server/static/assets/mocks-Dfvl6wOL.js b/packages/server/src/mdl_server/static/assets/mocks-CG2pmWEb.js
similarity index 100%
rename from packages/server/src/mdl_server/static/assets/mocks-Dfvl6wOL.js
rename to packages/server/src/mdl_server/static/assets/mocks-CG2pmWEb.js
diff --git a/packages/server/src/mdl_server/static/assets/sme-BFiNU1gH.css b/packages/server/src/mdl_server/static/assets/sme-BFiNU1gH.css
new file mode 100644
index 0000000..a6d770f
--- /dev/null
+++ b/packages/server/src/mdl_server/static/assets/sme-BFiNU1gH.css
@@ -0,0 +1 @@
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label{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-dim)}.sa-expand-row input[type=number]{width:56px;padding:6px 8px;border-radius:7px;border:1px solid var(--border);background:var(--bg-card);color:var(--text)}.sa-hops{margin-top:12px;display:flex;flex-direction:column;gap:4px}.sa-hop{display:flex;align-items:baseline;gap:9px;padding:7px 10px;border-radius:7px;background:var(--bg-card);border:1px solid var(--border);font-size:13px;cursor:pointer}.sa-hop 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10px;border-radius:8px;font-size:13px;border:1px solid var(--accent);background:var(--bg-card);color:var(--text);outline:none;font-family:var(--font)}.sme-sa{display:flex;align-items:center;gap:8px}.sme-sa>:first-child{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sme-sa .sme-sa-count{float:none;margin-left:auto;flex:none}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.sa-modal{width:min(900px,92vw);max-height:88vh}.sa-modal .sa-panes{margin-top:14px}.sa-modal .sa-pane{min-height:200px;max-height:260px}.sa-modal .sa-filter{margin-top:14px}.sa-modal .sa-expand{margin-top:16px}
diff --git a/packages/server/src/mdl_server/static/assets/sme-C7XDneCF.css b/packages/server/src/mdl_server/static/assets/sme-C7XDneCF.css
deleted file mode 100644
index 2bb5f46..0000000
--- a/packages/server/src/mdl_server/static/assets/sme-C7XDneCF.css
+++ /dev/null
@@ -1 +0,0 @@
-:root{--bg: #0e1218;--bg-raised: #161c26;--bg-card: #1b232f;--border: #2a3442;--border-strong: #3d4a5c;--text: #e6ecf3;--text-dim: #93a1b5;--accent: #5eead4;--pk: #fcd34d;--err: #f87171;--ok: #34d399;--font: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, "SF Mono", Menlo, monospace}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font);background:var(--bg);color:var(--text)}.sme{display:flex;flex-direction:column;height:100%}.sme-splash{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:var(--text-dim)}.sme-splash.error pre{background:var(--bg-card);padding:12px;border-radius:8px;color:var(--err)}.sme-top{display:flex;align-items:center;gap:16px;padding:12px 20px;background:var(--bg-raised);border-bottom:1px solid var(--border)}.sme-brand{display:flex;align-items:baseline;gap:8px;font-weight:700;white-space:nowrap}.sme-logo{color:var(--accent);font-size:18px}.sme-project{color:var(--text-dim);font-weight:400;font-size:13px}.sme-search{flex:0 1 420px;padding:9px 14px;border-radius:9px;font-size:14px;border:1px solid var(--border);background:var(--bg-card);color:var(--text);outline:none}.sme-search:focus{border-color:var(--accent)}.sme-tray{margin-left:auto;padding:9px 16px;border-radius:99px;border:none;cursor:pointer;background:var(--pk);color:#1a1400;font-weight:700;font-size:13px}.sme-chip{display:inline-block;font-size:11px;padding:2px 9px;margin:0 4px 0 0;border-radius:99px;background:#94a3b824;color:var(--text-dim)}.sme-chip.catalog{background:#fbbf2429;color:#fbbf24}.sme-catalog-banner{border:1px solid rgba(251,191,36,.35);background:#fbbf2414;border-radius:8px;padding:10px 12px;font-size:13px;line-height:1.5;color:var(--text);margin:4px 0 10px}.sme-catalog-banner 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12px;border-radius:9px;cursor:pointer;margin-bottom:4px}.sme-list-item:hover{background:var(--bg-card)}.sme-list-item.active{background:#5eead41a;box-shadow:inset 2px 0 0 var(--accent)}.sme-term-name{font-weight:600;font-size:14px;margin-right:6px}.sme-kind{font-size:10px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.05em}.sme-badge{font-size:10px;padding:1px 7px;border-radius:99px;margin-left:4px;background:#94a3b829;color:var(--text-dim)}.sme-badge.proposed{background:#fcd34d29;color:var(--pk)}.sme-term-def{display:block;color:var(--text-dim);font-size:12px;margin-top:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sme-empty{color:var(--text-dim);padding:12px;font-style:italic}.sme-detail{overflow-y:auto;padding:24px 32px}.sme-placeholder{color:var(--text-dim);margin-top:40px;text-align:center}.sme-card-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.sme-card-head h1,.sme-card-head h2{margin:0 0 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input:focus{border-color:var(--accent)}.sme-field-row{display:flex;gap:16px;margin-top:22px}.sme-field-row .sme-field{flex:1}.sme-syn-row{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.sme-syn-row input{flex:1;min-width:120px}.sme-chip.removable{cursor:pointer;background:#5eead424;color:var(--accent)}.sme-align-results{display:flex;flex-direction:column;gap:6px;max-height:240px;overflow-y:auto;margin:8px 0}.sme-align-card{text-align:left;background:var(--bg-card);border:1px solid var(--border);border-radius:9px;padding:10px 12px;cursor:pointer;color:var(--text)}.sme-align-card:hover{border-color:var(--accent)}.sme-align-card 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diff --git a/packages/server/src/mdl_server/static/assets/sme-CnDkXpN4.js b/packages/server/src/mdl_server/static/assets/sme-CnDkXpN4.js
new file mode 100644
index 0000000..27a9cf1
--- /dev/null
+++ b/packages/server/src/mdl_server/static/assets/sme-CnDkXpN4.js
@@ -0,0 +1,2 @@
+const __vite__mapDeps=(i,m=__vite__mapDeps,d=(m.f||(m.f=["assets/ModelDiagram-DmGsnZ_X.js","assets/client-DOmNpTln.js","assets/styles-Cp8yHIFV.js","assets/styles-CgxFEJWy.css"])))=>i.map(i=>d[i]);
+import{r as n,j as e,c as Ee,R as $e}from"./client-DOmNpTln.js";import{p as pe,b as je,c as xe,d as be,e as fe,R as Re,M as Me,O as De,L as Pe,h as Oe,i as Ie,A as Te,j as Be,k as Le,l as Fe,o as ze,s as qe,f as le,m as We,n as Ge,q as He}from"./styles-Cp8yHIFV.js";/* empty css            */const Ve="0123456789ABCDEFGHJKMNPQRSTVWXYZ";function ce(s,t){let a="";for(let c=0;c<t;c++)a=Ve[Number(s&31n)]+a,s>>=5n;return a}function ge(){const s=BigInt(Date.now())&(1n<<48n)-1n,t=new Uint8Array(10);crypto.getRandomValues(t);let a=0n;for(const c of t)a=a<<8n|BigInt(c);return ce(s,10)+ce(a,16)}const Ke={create_entity:["id","conceptual_id"],create_relationship:["id","from_fk_id"],create_subject_area:["id"],create_term:["id"],create_domain:["id"],create_code_set:["id"],create_key_group:["id"],create_category:["id"],add_attribute:["id"]};function Ue(s,t){const a=Ke[s];if(!a)return t;const c={...t};for(const r of a)c[r]||(c[r]=ge());return c}function 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deleted file mode 100644
index cdce717..0000000
--- a/packages/server/src/mdl_server/static/assets/sme-M2gtckV0.js
+++ /dev/null
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diff --git a/packages/server/src/mdl_server/static/assets/styles-BvUlSDpb.js b/packages/server/src/mdl_server/static/assets/styles-Cp8yHIFV.js
similarity index 96%
rename from packages/server/src/mdl_server/static/assets/styles-BvUlSDpb.js
rename to packages/server/src/mdl_server/static/assets/styles-Cp8yHIFV.js
index 1178643..96e23f0 100644
--- a/packages/server/src/mdl_server/static/assets/styles-BvUlSDpb.js
+++ b/packages/server/src/mdl_server/static/assets/styles-Cp8yHIFV.js
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th({onSelectionContextMenu:e,noPanClassName:t,disableKeyboardA11y:n}){const r=oe(),{width:s,height:i,x:o,y:a,transformString:l,userSelectionActive:c}=ee(eh,le),u=vo(),d=w.useRef(null);if(w.useEffect(()=>{var y;n||(y=d.current)==null||y.focus({preventScroll:!0})},[n]),bo({nodeRef:d}),c||!s||!i)return null;const m=e?y=>{const x=r.getState().getNodes().filter(_=>_.selected);e(y,x)}:void 0,f=y=>{Object.prototype.hasOwnProperty.call(yt,y.key)&&u({x:yt[y.key].x,y:yt[y.key].y,isShiftPressed:y.shiftKey})};return C.createElement("div",{className:ue(["react-flow__nodesselection","react-flow__container",t]),style:{transform:l}},C.createElement("div",{ref:d,className:"react-flow__nodesselection-rect",onContextMenu:m,tabIndex:n?void 0:-1,onKeyDown:n?void 0:f,style:{width:s,height:i,top:a,left:o}}))}var nh=w.memo(th);const rh=e=>e.nodesSelectionActive,_o=({children:e,onPaneClick:t,onPaneMouseEnter:n,onPaneMouseMove:r,onPaneMouseLeave:s,onPaneContextMenu:i,onPaneScroll:o,deleteKeyCode:a,onMove:l,onMoveStart:c,onMoveEnd:u,selectionKeyCode:d,selectionOnDrag:m,selectionMode:f,onSelectionStart:y,onSelectionEnd:x,multiSelectionKeyCode:_,panActivationKeyCode:g,zoomActivationKeyCode:b,elementsSelectable:M,zoomOnScroll:E,zoomOnPinch:T,panOnScroll:j,panOnScrollSpeed:I,panOnScrollMode:F,zoomOnDoubleClick:S,panOnDrag:D,defaultViewport:L,translateExtent:V,minZoom:H,maxZoom:p,preventScrolling:k,onSelectionContextMenu:N,noWheelClassName:R,noPanClassName:$,disableKeyboardA11y:v})=>{const A=ee(rh),O=Yt(d),z=Yt(g),B=z||D,P=z||j,G=O||m&&B!==!0;return 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A=k||s,O=i&&v.ctrlKey;if((d===!0||Array.isArray(d)&&d.includes(1))&&v.button===1&&v.type==="mousedown"&&(ht(v,"react-flow__node")||ht(v,"react-flow__edge")))return!0;if(!d&&!A&&!o&&!c&&!i||p||!c&&v.type==="dblclick"||ht(v,M)&&v.type==="wheel"||ht(v,E)&&(v.type!=="wheel"||o&&v.type==="wheel"&&!k)||!i&&v.ctrlKey&&v.type==="wheel"||!A&&!o&&!O&&v.type==="wheel"||!d&&(v.type==="mousedown"||v.type==="touchstart")||Array.isArray(d)&&!d.includes(v.button)&&v.type==="mousedown")return!1;const z=Array.isArray(d)&&d.includes(v.button)||!v.button||v.button<=1;return(!v.ctrlKey||v.type==="wheel")&&z})},[p,L,s,i,o,c,d,u,k]),C.createElement("div",{className:"react-flow__renderer",ref:S,style:Ir},b)},Wf=e=>({userSelectionActive:e.userSelectionActive,userSelectionRect:e.userSelectionRect});function Uf(){const{userSelectionActive:e,userSelectionRect:t}=ee(Wf,le);return e&&t?C.createElement("div",{className:"react-flow__selection 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Gn=(e,t)=>n=>{n.target===t.current&&(e==null||e(n))},Zf=e=>({userSelectionActive:e.userSelectionActive,elementsSelectable:e.elementsSelectable,dragging:e.paneDragging}),yo=w.memo(({isSelecting:e,selectionMode:t=Gt.Full,panOnDrag:n,onSelectionStart:r,onSelectionEnd:s,onPaneClick:i,onPaneContextMenu:o,onPaneScroll:a,onPaneMouseEnter:l,onPaneMouseMove:c,onPaneMouseLeave:u,children:d})=>{const m=w.useRef(null),f=oe(),y=w.useRef(0),x=w.useRef(0),_=w.useRef(),{userSelectionActive:g,elementsSelectable:b,dragging:M}=ee(Zf,le),E=()=>{f.setState({userSelectionActive:!1,userSelectionRect:null}),y.current=0,x.current=0},T=H=>{i==null||i(H),f.getState().resetSelectedElements(),f.setState({nodesSelectionActive:!1})},j=H=>{if(Array.isArray(n)&&(n!=null&&n.includes(2))){H.preventDefault();return}o==null||o(H)},I=a?H=>a(H):void 0,F=H=>{const{resetSelectedElements:p,domNode:k}=f.getState();if(_.current=k==null?void 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Array.from(e.values()).filter(s=>(s.selected||s.id===r)&&(!s.parentNode||s.parentId||!xo(s,e))&&(s.draggable||t&&typeof s.draggable>"u")).map(s=>{var i,o;return{id:s.id,position:s.position||{x:0,y:0},positionAbsolute:s.positionAbsolute||{x:0,y:0},distance:{x:n.x-(((i=s.positionAbsolute)==null?void 0:i.x)??0),y:n.y-(((o=s.positionAbsolute)==null?void 0:o.y)??0)},delta:{x:0,y:0},extent:s.extent,parentNode:s.parentNode||s.parentId,parentId:s.parentNode||s.parentId,width:s.width,height:s.height,expandParent:s.expandParent}})}function Qf(e,t){return!t||t==="parent"?t:[t[0],[t[1][0]-(e.width||0),t[1][1]-(e.height||0)]]}function wo(e,t,n,r,s=[0,0],i){const o=Qf(e,e.extent||r);let a=o;const l=e.parentNode||e.parentId;if(e.extent==="parent"&&!e.expandParent)if(l&&e.width&&e.height){const d=n.get(l),{x:m,y:f}=tt(d,s).positionAbsolute;a=d&&we(m)&&we(f)&&we(d.width)&&we(d.height)?[[m+e.width*s[0],f+e.height*s[1]],[m+d.width-e.width+e.width*s[0],f+d.height-e.height+e.height*s[1]]]:a}else 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a=oe(),[l,c]=w.useState(!1),u=w.useRef([]),d=w.useRef({x:null,y:null}),m=w.useRef(0),f=w.useRef(null),y=w.useRef({x:0,y:0}),x=w.useRef(null),_=w.useRef(!1),g=w.useRef(!1),b=w.useRef(!1),M=Jf();return w.useEffect(()=>{if(e!=null&&e.current){const E=xe(e.current),T=({x:F,y:S})=>{const{nodeInternals:D,onNodeDrag:L,onSelectionDrag:V,updateNodePositions:H,nodeExtent:p,snapGrid:k,snapToGrid:N,nodeOrigin:R,onError:$}=a.getState();d.current={x:F,y:S};let v=!1,A={x:0,y:0,x2:0,y2:0};if(u.current.length>1&&p){const z=Mn(u.current,R);A=Bt(z)}if(u.current=u.current.map(z=>{const B={x:F-z.distance.x,y:S-z.distance.y};N&&(B.x=k[0]*Math.round(B.x/k[0]),B.y=k[1]*Math.round(B.y/k[1]));const P=[[p[0][0],p[0][1]],[p[1][0],p[1][1]]];u.current.length>1&&p&&!z.extent&&(P[0][0]=z.positionAbsolute.x-A.x+p[0][0],P[1][0]=z.positionAbsolute.x+(z.width??0)-A.x2+p[1][0],P[0][1]=z.positionAbsolute.y-A.y+p[0][1],P[1][1]=z.positionAbsolute.y+(z.height??0)-A.y2+p[1][1]);const G=wo(z,B,D,P,R,$);return 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n("rename_relationship",{id:e.id,name:i.trim()}),(a!==e.cardinality||c!==e.optionality||d!==e.identifying)&&await n("update_relationship",{id:e.id,cardinality:a,optionality:c,identifying:d}),r()},_=()=>n("delete_relationship",{id:e.id}).then(r);return h.jsxs(qt,{title:`${s(e.from.entity)} → ${s(e.to.entity)}`,onClose:r,children:[h.jsxs("label",{className:"form-row",children:["relationship 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delete"}):h.jsx("button",{className:"mini-btn danger",onClick:()=>y(!0),children:"Delete relationship"}),h.jsx("button",{className:"primary-btn",onClick:x,children:"Save"})]})]})}const Hy=w.memo(function({id:t,sourceX:n,sourceY:r,targetX:s,targetY:i,sourcePosition:o,targetPosition:a,data:l,selected:c}){const[u]=wn({sourceX:n,sourceY:r,sourcePosition:o,targetX:s,targetY:i,targetPosition:a,borderRadius:10}),d=l==null?void 0:l.relationship,m=(l==null?void 0:l.dimmed)??!1,f=(d==null?void 0:d.cardinality)??"many_to_one",y=(d==null?void 0:d.optionality)==="optional",x=(d==null?void 0:d.identifying)??!1,_=f==="many_to_one"||f==="many_to_many",g=f==="one_to_many"||f==="many_to_many",b="rel-edge"+(c?" selected":"")+(m?" dimmed":"");return h.jsxs("g",{className:b,children:[h.jsx("path",{id:t,className:"rel-path",d:u,fill:"none",strokeDasharray:x?void 0:"6 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0:c.length)??0)===0&&!l.no_industry_equivalent&&h.jsx("span",{className:"align-arrow missing",children:"unaligned"})]},l.id)})]},a))]})}function Uy({readOnly:e,refreshKey:t,onModelChanged:n}){const[r,s]=w.useState(null),[i,o]=w.useState(""),[a,l]=w.useState(""),[c,u]=w.useState(!1),d=w.useCallback(()=>{hm().then(s).catch(()=>s(null)),mm().then(m=>o([m.diff,...m.untracked].filter(Boolean).join(`
 
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-`},f))}),!e&&h.jsxs(h.Fragment,{children:[h.jsx("input",{className:"edit-input",placeholder:"commit message…",value:a,onChange:m=>l(m.target.value)}),h.jsxs("div",{className:"modal-footer",children:[h.jsx("button",{className:"mini-btn danger",disabled:c,onClick:()=>{confirm("Discard ALL uncommitted model changes?")&&(u(!0),gm().then(()=>{u(!1),d(),n()}))},children:"Discard all"}),h.jsx("button",{className:"primary-btn",disabled:c||!a.trim(),onClick:()=>{u(!0),pm(a).then(()=>{u(!1),l(""),d()})},children:"Commit"})]})]})]}):h.jsx("div",{className:"panel-body",children:"model directory is not in a git repo"})}function Xy({readOnly:e}){const[t,n]=w.useState([]),r=w.useCallback(()=>{ym().then(i=>n(i.decisions)).catch(()=>n([]))},[]);if(w.useEffect(r,[r]),t.length===0)return h.jsx("div",{className:"panel-body",children:"no recorded decisions (run `mdl reverse` to propose)"});const s={accepted:"✓",rejected:"✗",proposed:"?"};return h.jsx("div",{className:"panel-body",children:t.map(i=>h.jsxs("div",{className:"decision "+i.verdict,children:[h.jsxs("div",{className:"decision-head",children:[h.jsx("span",{className:"decision-mark",children:s[i.verdict]}),h.jsx("span",{className:"chip",children:i.confidence}),h.jsx("span",{className:"chip",children:i.signal})]}),h.jsx("p",{className:"decision-subject",children:i.subject}),!e&&i.verdict==="proposed"&&h.jsxs("div",{className:"decision-actions",children:[h.jsx("button",{className:"mini-btn",onClick:()=>Ms(i.signal_key,"accepted").then(r),children:"Accept"}),h.jsx("button",{className:"mini-btn danger",onClick:()=>Ms(i.signal_key,"rejected").then(r),children:"Reject"})]})]},i.signal_key))})}export{Lo as A,cm as B,rm as C,xm as E,Wy as L,px as M,Gy as O,si as P,Co as R,gx as S,Qy as a,ox as b,cx as c,ux as d,dx as e,Ky as f,hm as g,ax as h,nx as i,rx as j,sx as k,ix as l,ex as m,tx as n,Po as o,lx as p,ni as q,Mo as r,Jy as s,Hy as t,Zh as u};
+`},f))}),!e&&h.jsxs(h.Fragment,{children:[h.jsx("input",{className:"edit-input",placeholder:"commit message…",value:a,onChange:m=>l(m.target.value)}),h.jsxs("div",{className:"modal-footer",children:[h.jsx("button",{className:"mini-btn danger",disabled:c,onClick:()=>{confirm("Discard ALL uncommitted model changes?")&&(u(!0),gm().then(()=>{u(!1),d(),n()}))},children:"Discard all"}),h.jsx("button",{className:"primary-btn",disabled:c||!a.trim(),onClick:()=>{u(!0),pm(a).then(()=>{u(!1),l(""),d()})},children:"Commit"})]})]})]}):h.jsx("div",{className:"panel-body",children:"model directory is not in a git repo"})}function Xy({readOnly:e}){const[t,n]=w.useState([]),r=w.useCallback(()=>{ym().then(i=>n(i.decisions)).catch(()=>n([]))},[]);if(w.useEffect(r,[r]),t.length===0)return h.jsx("div",{className:"panel-body",children:"no recorded decisions (run `mdl reverse` to propose)"});const s={accepted:"✓",rejected:"✗",proposed:"?"};return h.jsx("div",{className:"panel-body",children:t.map(i=>h.jsxs("div",{className:"decision "+i.verdict,children:[h.jsxs("div",{className:"decision-head",children:[h.jsx("span",{className:"decision-mark",children:s[i.verdict]}),h.jsx("span",{className:"chip",children:i.confidence}),h.jsx("span",{className:"chip",children:i.signal})]}),h.jsx("p",{className:"decision-subject",children:i.subject}),!e&&i.verdict==="proposed"&&h.jsxs("div",{className:"decision-actions",children:[h.jsx("button",{className:"mini-btn",onClick:()=>Ms(i.signal_key,"accepted").then(r),children:"Accept"}),h.jsx("button",{className:"mini-btn danger",onClick:()=>Ms(i.signal_key,"rejected").then(r),children:"Reject"})]})]},i.signal_key))})}export{Lo as A,cm as B,rm as C,xm as E,Wy as L,gx as M,Gy as O,si as P,Co as R,yx as S,Qy as a,ax as b,ux as c,dx as d,fx as e,Ky as f,hm as g,lx as h,nx as i,rx as j,sx as k,ox as l,ix as m,ex as n,Po as o,cx as p,tx as q,ni as r,Jy as s,Mo as t,Hy as u,Zh as v};
diff --git a/packages/server/src/mdl_server/static/index.html b/packages/server/src/mdl_server/static/index.html
index 151d61a..dfcd2fa 100644
--- a/packages/server/src/mdl_server/static/index.html
+++ b/packages/server/src/mdl_server/static/index.html
@@ -4,9 +4,9 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Modelith</title>
-    <script type="module" crossorigin src="/assets/main-BHA5ri5a.js"></script>
+    <script type="module" crossorigin src="/assets/main-DKFrx98H.js"></script>
     <link rel="modulepreload" crossorigin href="/assets/client-DOmNpTln.js">
-    <link rel="modulepreload" crossorigin href="/assets/styles-BvUlSDpb.js">
+    <link rel="modulepreload" crossorigin href="/assets/styles-Cp8yHIFV.js">
     <link rel="stylesheet" crossorigin href="/assets/styles-CgxFEJWy.css">
   </head>
   <body>
diff --git a/packages/server/src/mdl_server/static/mocks.html b/packages/server/src/mdl_server/static/mocks.html
index be90a96..a77066b 100644
--- a/packages/server/src/mdl_server/static/mocks.html
+++ b/packages/server/src/mdl_server/static/mocks.html
@@ -4,10 +4,10 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Modelith — Model Git-Ops mocks</title>
-    <script type="module" crossorigin src="/assets/mocks-Dfvl6wOL.js"></script>
+    <script type="module" crossorigin src="/assets/mocks-CG2pmWEb.js"></script>
     <link rel="modulepreload" crossorigin href="/assets/client-DOmNpTln.js">
     <link rel="stylesheet" crossorigin href="/assets/mocks-MuxcEIum.css">
-    <link rel="stylesheet" crossorigin href="/assets/sme-C7XDneCF.css">
+    <link rel="stylesheet" crossorigin href="/assets/sme-BFiNU1gH.css">
   </head>
   <body>
     <div id="root"></div>
diff --git a/packages/server/src/mdl_server/static/sme.html b/packages/server/src/mdl_server/static/sme.html
index 5fdc509..1f215ff 100644
--- a/packages/server/src/mdl_server/static/sme.html
+++ b/packages/server/src/mdl_server/static/sme.html
@@ -4,11 +4,11 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Modelith Glossary</title>
-    <script type="module" crossorigin src="/assets/sme-M2gtckV0.js"></script>
+    <script type="module" crossorigin src="/assets/sme-CnDkXpN4.js"></script>
     <link rel="modulepreload" crossorigin href="/assets/client-DOmNpTln.js">
-    <link rel="modulepreload" crossorigin href="/assets/styles-BvUlSDpb.js">
+    <link rel="modulepreload" crossorigin href="/assets/styles-Cp8yHIFV.js">
     <link rel="stylesheet" crossorigin href="/assets/styles-CgxFEJWy.css">
-    <link rel="stylesheet" crossorigin href="/assets/sme-C7XDneCF.css">
+    <link rel="stylesheet" crossorigin href="/assets/sme-BFiNU1gH.css">
   </head>
   <body>
     <div id="root"></div>
diff --git a/packages/server/tests/test_audit.py b/packages/server/tests/test_audit.py
new file mode 100644
index 0000000..0dfec5e
--- /dev/null
+++ b/packages/server/tests/test_audit.py
@@ -0,0 +1,160 @@
+"""Audit log: JSONL sink, off-by-default, records writes + refusals, admin-gated read
+(spec §20). OTLP export is exercised only for the config decision (the SDK is an
+optional extra, so we don't require a live collector here)."""
+
+from __future__ import annotations
+
+import json
+import subprocess
+
+import pytest
+from mdl_server.audit import (
+    ENV_AUDIT_LOG,
+    ENV_OTLP_ENDPOINT,
+    AuditSink,
+)
+
+# --- the sink in isolation --------------------------------------------------------
+
+
+def test_off_by_default(tmp_path):
+    sink = AuditSink.from_env({})
+    assert sink.enabled is False
+    # a record on a disabled sink is a no-op, not an error
+    sink.record("command", identity="x", source="git", target="set_definition", outcome="ok")
+    assert list(tmp_path.iterdir()) == []
+
+
+def test_jsonl_records_a_write(tmp_path):
+    log = tmp_path / "audit.jsonl"
+    sink = AuditSink.from_env({ENV_AUDIT_LOG: str(log)})
+    assert sink.enabled is True
+    sink.record(
+        "propose", identity="anita@corp.com", source="proxy",
+        target="sme/anita/x", outcome="ok", detail="3 changes",
+    )
+    rec = json.loads(log.read_text().strip())
+    assert rec["op"] == "propose"
+    assert rec["identity"] == "anita@corp.com"
+    assert rec["source"] == "proxy"
+    assert rec["outcome"] == "ok"
+    assert rec["detail"] == "3 changes"
+    assert rec["ts"].endswith("Z")
+
+
+def test_records_a_denied_write(tmp_path):
+    """The whole point: a refused write is captured, though it never became a commit
+    and so is invisible in git."""
+    log = tmp_path / "audit.jsonl"
+    sink = AuditSink.from_env({ENV_AUDIT_LOG: str(log)})
+    sink.record("propose", identity="", source="anonymous", target="-", outcome="denied",
+                detail="needs identity")
+    rec = json.loads(log.read_text().strip())
+    assert rec["outcome"] == "denied"
+    assert rec["source"] == "anonymous"
+
+
+def test_append_only_and_read_newest_first(tmp_path):
+    log = tmp_path / "audit.jsonl"
+    sink = AuditSink.from_env({ENV_AUDIT_LOG: str(log)})
+    for i in range(3):
+        sink.record("command", identity="u", source="git", target=f"op{i}", outcome="ok")
+    assert len(log.read_text().splitlines()) == 3  # appended, not overwritten
+    recs = sink.read(limit=10)
+    assert [r["target"] for r in recs] == ["op2", "op1", "op0"]  # newest first
+
+
+def test_read_filters_by_op_and_identity(tmp_path):
+    log = tmp_path / "audit.jsonl"
+    sink = AuditSink.from_env({ENV_AUDIT_LOG: str(log)})
+    sink.record("command", identity="a", source="git", target="x", outcome="ok")
+    sink.record("propose", identity="b", source="git", target="y", outcome="ok")
+    assert [r["target"] for r in sink.read(op="propose")] == ["y"]
+    assert [r["target"] for r in sink.read(identity="a")] == ["x"]
+
+
+def test_bad_outcome_is_normalized(tmp_path):
+    log = tmp_path / "audit.jsonl"
+    sink = AuditSink.from_env({ENV_AUDIT_LOG: str(log)})
+    sink.record("command", identity="u", source="git", target="x", outcome="bogus")
+    assert json.loads(log.read_text().strip())["outcome"] == "error"
+
+
+def test_otlp_endpoint_makes_sink_enabled_even_without_file(tmp_path, monkeypatch):
+    """Setting only the OTEL endpoint enables auditing. Whether the SDK is installed
+    or not, `enabled` is driven by configuration; missing packages degrade to no
+    OTLP but must not raise."""
+    sink = AuditSink.from_env({ENV_OTLP_ENDPOINT: "http://localhost:4318"})
+    # If OTel isn't installed the logger is None and only OTLP is unavailable — but
+    # from_env still parsed the endpoint. Enabled iff a logger OR a file exists.
+    # With no file and no SDK, enabled is False; with the SDK, True. Either way, no raise.
+    assert isinstance(sink.enabled, bool)
+
+
+# --- through the server -----------------------------------------------------------
+
+
+@pytest.fixture
+def git_model_dir(model_dir):
+    for a in (
+        ["init", "-q", str(model_dir)],
+        ["-C", str(model_dir), "config", "user.email", "t@t.co"],
+        ["-C", str(model_dir), "config", "user.name", "t"],
+        ["-C", str(model_dir), "add", "-A"],
+        ["-C", str(model_dir), "commit", "-qm", "base"],
+        ["-C", str(model_dir), "branch", "-M", "main"],
+    ):
+        subprocess.run(["git", *a], check=True)
+    return model_dir
+
+
+def test_command_write_is_audited(git_model_dir, tmp_path, monkeypatch):
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+
+    log = tmp_path / "audit.jsonl"
+    monkeypatch.setenv(ENV_AUDIT_LOG, str(log))
+    client = TestClient(create_app(git_model_dir))
+
+    ce = next(
+        e for e in client.get("/api/model").json()["entities"] if e["name"] == "counterparty"
+    )["conceptual"]["id"]
+    r = client.post(
+        "/api/command",
+        json={"op": "set_definition", "payload": {"id": ce, "definition": "audited."}},
+    )
+    assert r.status_code == 200, r.text
+    recs = [json.loads(ln) for ln in log.read_text().splitlines()]
+    assert any(x["op"] == "command" and x["target"] == "set_definition" and x["outcome"] == "ok"
+               for x in recs), recs
+
+
+def test_audit_endpoint_is_admin_gated_under_require(git_model_dir, tmp_path, monkeypatch):
+    """With MDL_AUTH_REQUIRE and no identity, the audit trail must not be readable by
+    an anonymous viewer."""
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+    from mdl_server.identity import ENV_REQUIRE
+
+    log = tmp_path / "audit.jsonl"
+    monkeypatch.setenv(ENV_AUDIT_LOG, str(log))
+    monkeypatch.setenv(ENV_REQUIRE, "1")
+    # isolate git so the request has no resolvable identity -> anonymous
+    empty = tmp_path / "empty.gitconfig"
+    empty.write_text("")
+    monkeypatch.setenv("GIT_CONFIG_GLOBAL", str(empty))
+    monkeypatch.setenv("GIT_CONFIG_SYSTEM", str(empty))
+    subprocess.run(["git", "-C", str(git_model_dir), "config", "--unset", "user.name"], check=False)
+    subprocess.run(["git", "-C", str(git_model_dir), "config", "--unset", "user.email"], check=False)
+
+    client = TestClient(create_app(git_model_dir))
+    assert client.get("/api/audit").status_code == 403
+
+
+def test_audit_endpoint_absent_when_auditing_off(git_model_dir):
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+
+    client = TestClient(create_app(git_model_dir))  # no MDL_AUDIT_LOG
+    # With auditing off, /api/audit returns a clean 404 (not the SPA page, not data).
+    assert client.get("/api/audit").status_code == 404
diff --git a/packages/server/tests/test_diff_api.py b/packages/server/tests/test_diff_api.py
index 2a0873d..2f310e6 100644
--- a/packages/server/tests/test_diff_api.py
+++ b/packages/server/tests/test_diff_api.py
@@ -220,10 +220,12 @@ def test_conflicts_writes_nothing(client, repo):
 
 
 def test_context_reports_branch_and_dirtiness(client, repo):
+    # The trusted git-config identity (t@t.co) overrides the query-string user,
+    # so the branch prefix reflects who the server actually thinks you are (§17).
     doc = client.get("/api/git/context", params={"user": "a.hough"}).json()
     assert doc["git"] and doc["branch"] == "main" and doc["on_base"] is True
     assert doc["dirty"] is False and doc["can_propose"] is True
-    assert doc["sme_branch_prefix"] == "sme/a-hough/"
+    assert doc["sme_branch_prefix"] == "sme/t-t-co/"
 
     (repo / "conceptual" / "entities" / "counterparty.yaml").write_text("broken: true\n")
     doc = client.get("/api/git/context").json()
@@ -236,15 +238,15 @@ def test_proposals_are_fully_populated_without_gh(client, repo, monkeypatch):
 
     monkeypatch.setattr(ga.shutil, "which", lambda _n: None)  # no gh on PATH
 
-    _git(repo, "checkout", "-q", "-b", "sme/a-hough/clarify")
+    _git(repo, "checkout", "-q", "-b", "sme/t-t-co/clarify")
     ce = repo / "conceptual" / "entities" / "counterparty.yaml"
     ce.write_text(ce.read_text().replace("A legal person", "Restated"))
     _git(repo, "commit", "-qam", "Clarify Counterparty definition")
     _git(repo, "checkout", "-q", "main")
 
-    doc = client.get("/api/git/proposals", params={"user": "a.hough"}).json()
+    doc = client.get("/api/git/proposals").json()
     assert doc["ok"] and doc["gh"] is False
-    p = next(x for x in doc["proposals"] if x["branch"] == "sme/a-hough/clarify")
+    p = next(x for x in doc["proposals"] if x["branch"] == "sme/t-t-co/clarify")
     # everything but the PR row survives the absence of gh
     assert p["title"] == "Clarify Counterparty definition"
     assert p["pushed"] is False and p["merged"] is False and p["ahead"] == 1
@@ -252,15 +254,15 @@ def test_proposals_are_fully_populated_without_gh(client, repo, monkeypatch):
 
 
 def test_merged_proposal_is_reported_as_merged(client, repo):
-    _git(repo, "checkout", "-q", "-b", "sme/a-hough/syn")
+    _git(repo, "checkout", "-q", "-b", "sme/t-t-co/syn")
     ce = repo / "conceptual" / "entities" / "counterparty.yaml"
     ce.write_text(ce.read_text() + "\n")
     _git(repo, "commit", "-qam", "Add synonym")
     _git(repo, "checkout", "-q", "main")
-    _git(repo, "merge", "-q", "--no-ff", "-m", "merge", "sme/a-hough/syn")
+    _git(repo, "merge", "-q", "--no-ff", "-m", "merge", "sme/t-t-co/syn")
 
     doc = client.get("/api/git/proposals").json()
-    p = next(x for x in doc["proposals"] if x["branch"] == "sme/a-hough/syn")
+    p = next(x for x in doc["proposals"] if x["branch"] == "sme/t-t-co/syn")
     assert p["merged"] is True
 
 
diff --git a/packages/server/tests/test_identity.py b/packages/server/tests/test_identity.py
new file mode 100644
index 0000000..4dd3f68
--- /dev/null
+++ b/packages/server/tests/test_identity.py
@@ -0,0 +1,239 @@
+"""Identity resolution + safe defaults + author precedence (spec §17).
+
+Pure unit tests — no server. The one rule under test everywhere: a raw request
+header is trusted ONLY when the operator opted in, and a trusted identity overrides
+any self-asserted client string.
+"""
+
+from __future__ import annotations
+
+import subprocess
+
+import pytest
+from mdl_server.identity import (
+    ENV_NAME_HEADER,
+    ENV_REQUIRE,
+    ENV_SECRET_HEADER,
+    ENV_SECRET_VALUE,
+    ENV_USER_HEADER,
+    IdentityPolicy,
+    _name_from_email,
+    effective_author,
+    resolve_identity,
+    write_denied_reason,
+)
+
+
+def _off() -> IdentityPolicy:
+    """A policy with header auth OFF — the default a solo user runs under."""
+    return IdentityPolicy.from_env({})
+
+
+@pytest.fixture
+def git_dir(tmp_path):
+    """A dir with a local git config identity (the solo path)."""
+    subprocess.run(["git", "init", "-q", str(tmp_path)], check=True)
+    subprocess.run(["git", "-C", str(tmp_path), "config", "user.name", "Solo Sam"], check=True)
+    subprocess.run(
+        ["git", "-C", str(tmp_path), "config", "user.email", "sam@laptop.local"], check=True
+    )
+    return tmp_path
+
+
+@pytest.fixture
+def bare_dir(tmp_path, monkeypatch):
+    """A dir with NO git identity at all — the true anonymous case. We isolate git
+    from any global/system config on the test machine (a developer's ~/.gitconfig
+    would otherwise supply a real identity and mask 'anonymous'), which is the
+    point: on a laptop WITH a global gitconfig the solo path correctly resolves to
+    that identity — see the git_dir tests — so 'anonymous' can only be exercised by
+    isolating it."""
+    empty = tmp_path / "empty.gitconfig"
+    empty.write_text("")
+    monkeypatch.setenv("GIT_CONFIG_GLOBAL", str(empty))
+    monkeypatch.setenv("GIT_CONFIG_SYSTEM", str(empty))
+    d = tmp_path / "work"
+    d.mkdir()
+    return d
+
+
+# --- the safe default: a raw header is never trusted without opt-in ---------------
+
+
+def test_raw_header_ignored_when_auth_off(bare_dir):
+    """The single most important test: header auth off + a spoofed X-Forwarded-User
+    header => anonymous, NEVER proxy. An app exposed with no config is safe."""
+    ident = resolve_identity(
+        {"X-Forwarded-User": "attacker@evil.com"}, _off(), bare_dir
+    )
+    assert ident.source == "anonymous"
+    assert ident.name == "" and ident.email == ""
+
+
+def test_git_config_used_when_no_proxy(git_dir):
+    ident = resolve_identity({"X-Forwarded-User": "ignored@x.com"}, _off(), git_dir)
+    assert ident.source == "git"
+    assert ident.name == "Solo Sam"
+    assert ident.email == "sam@laptop.local"
+
+
+def test_anonymous_when_nothing_known(bare_dir):
+    assert resolve_identity({}, _off(), bare_dir).source == "anonymous"
+
+
+# --- the proxy path (opted in) ----------------------------------------------------
+
+
+def test_proxy_header_trusted_when_opted_in(bare_dir):
+    policy = IdentityPolicy.from_env({ENV_USER_HEADER: "X-Auth-Request-Email"})
+    ident = resolve_identity(
+        {"X-Auth-Request-Email": "anita.hough@corp.com"}, policy, bare_dir
+    )
+    assert ident.source == "proxy"
+    assert ident.email == "anita.hough@corp.com"
+    assert ident.name == "Anita Hough"  # derived from the local-part
+
+
+def test_proxy_name_header_wins_over_derived(bare_dir):
+    policy = IdentityPolicy.from_env(
+        {ENV_USER_HEADER: "X-Auth-Request-Email", ENV_NAME_HEADER: "X-Auth-Request-User"}
+    )
+    ident = resolve_identity(
+        {"X-Auth-Request-Email": "ah@corp.com", "X-Auth-Request-User": "Dr Anita Hough"},
+        policy,
+        bare_dir,
+    )
+    assert ident.name == "Dr Anita Hough"
+
+
+def test_proxy_falls_through_when_header_blank(git_dir):
+    """Header auth on but the proxy sent no user header on this request => not an
+    error, fall through to git config."""
+    policy = IdentityPolicy.from_env({ENV_USER_HEADER: "X-Auth-Request-Email"})
+    ident = resolve_identity({}, policy, git_dir)
+    assert ident.source == "git"
+
+
+# --- the shared-secret gate -------------------------------------------------------
+
+
+def _secret_policy() -> IdentityPolicy:
+    return IdentityPolicy.from_env(
+        {
+            ENV_USER_HEADER: "X-User",
+            ENV_SECRET_HEADER: "X-Proxy-Secret",
+            ENV_SECRET_VALUE: "s3cr3t",
+        }
+    )
+
+
+def test_secret_match_trusts_header(bare_dir):
+    ident = resolve_identity(
+        {"X-User": "a@b.com", "X-Proxy-Secret": "s3cr3t"}, _secret_policy(), bare_dir
+    )
+    assert ident.source == "proxy"
+
+
+def test_secret_mismatch_does_not_trust(bare_dir):
+    ident = resolve_identity(
+        {"X-User": "a@b.com", "X-Proxy-Secret": "wrong"}, _secret_policy(), bare_dir
+    )
+    assert ident.source == "anonymous"
+
+
+def test_secret_missing_does_not_trust(bare_dir):
+    ident = resolve_identity({"X-User": "a@b.com"}, _secret_policy(), bare_dir)
+    assert ident.source == "anonymous"
+
+
+def test_secret_header_without_value_fails_closed(bare_dir):
+    """A secret HEADER configured with no secret VALUE must disable header auth
+    entirely rather than trust the user header on a header's mere existence."""
+    policy = IdentityPolicy.from_env(
+        {ENV_USER_HEADER: "X-User", ENV_SECRET_HEADER: "X-Proxy-Secret"}
+    )
+    assert policy.header_auth_enabled is False
+    assert policy.misconfigured_secret(
+        {ENV_USER_HEADER: "X-User", ENV_SECRET_HEADER: "X-Proxy-Secret"}
+    )
+    ident = resolve_identity({"X-User": "a@b.com"}, policy, bare_dir)
+    assert ident.source == "anonymous"
+
+
+# --- author precedence ------------------------------------------------------------
+
+
+def test_effective_author_proxy_overrides_client(bare_dir):
+    policy = IdentityPolicy.from_env({ENV_USER_HEADER: "X-User"})
+    ident = resolve_identity({"X-User": "real@corp.com"}, policy, bare_dir)
+    author = effective_author(ident, "totally.someone.else")
+    assert author.source == "proxy"
+    assert author.email == "real@corp.com"  # the spoofed client string is ignored
+
+
+def test_effective_author_git_overrides_client(git_dir):
+    ident = resolve_identity({}, _off(), git_dir)
+    author = effective_author(ident, "someone.else")
+    assert author.source == "git"
+    assert author.email == "sam@laptop.local"
+
+
+def test_effective_author_falls_back_to_client_when_anonymous(bare_dir):
+    ident = resolve_identity({}, _off(), bare_dir)
+    author = effective_author(ident, "a.hough")
+    assert author.source == "anonymous"
+    assert author.name == "a.hough"
+    assert author.email == "a-hough@users.noreply.github.com"
+
+
+def test_effective_author_anonymous_and_empty_stays_anonymous(bare_dir):
+    ident = resolve_identity({}, _off(), bare_dir)
+    author = effective_author(ident, "")
+    assert author.source == "anonymous"
+    assert author.name == ""
+
+
+def test_name_from_email():
+    assert _name_from_email("anita.hough@corp.com") == "Anita Hough"
+    assert _name_from_email("a_b-c@x.io") == "A B C"
+    assert _name_from_email("plainuser") == "Plainuser"
+
+
+# --- the MDL_AUTH_REQUIRE write gate (spec §18 M8) --------------------------------
+
+
+def test_require_off_by_default(bare_dir):
+    policy = IdentityPolicy.from_env({})
+    assert policy.require_identity is False
+    ident = resolve_identity({}, policy, bare_dir)  # anonymous
+    assert write_denied_reason(ident, policy) is None  # solo never blocked
+
+
+def test_require_blocks_anonymous_write(bare_dir):
+    policy = IdentityPolicy.from_env({ENV_REQUIRE: "1"})
+    assert policy.require_identity is True
+    ident = resolve_identity({}, policy, bare_dir)
+    assert ident.source == "anonymous"
+    reason = write_denied_reason(ident, policy)
+    assert reason and "authenticated identity" in reason
+
+
+def test_require_allows_proxy_write(bare_dir):
+    policy = IdentityPolicy.from_env({ENV_REQUIRE: "yes", ENV_USER_HEADER: "X-User"})
+    ident = resolve_identity({"X-User": "a@b.com"}, policy, bare_dir)
+    assert ident.source == "proxy"
+    assert write_denied_reason(ident, policy) is None
+
+
+def test_require_allows_git_write(git_dir):
+    policy = IdentityPolicy.from_env({ENV_REQUIRE: "true"})
+    ident = resolve_identity({}, policy, git_dir)
+    assert ident.source == "git"
+    assert write_denied_reason(ident, policy) is None
+
+
+def test_require_various_truthy_values():
+    for v in ("1", "true", "TRUE", "Yes", "on", "require"):
+        assert IdentityPolicy.from_env({ENV_REQUIRE: v}).require_identity is True
+    for v in ("0", "false", "no", "", "off"):
+        assert IdentityPolicy.from_env({ENV_REQUIRE: v}).require_identity is False
diff --git a/packages/server/tests/test_preview.py b/packages/server/tests/test_preview.py
index 9b533e9..edc8c4f 100644
--- a/packages/server/tests/test_preview.py
+++ b/packages/server/tests/test_preview.py
@@ -364,3 +364,55 @@ def test_promote_alignment_is_not_proposable(client, model_dir):
 
     assert "promote_alignment" not in _PROPOSABLE_OPS
     assert "promote_alignment" in _NOT_PROPOSABLE_REASON
+
+
+# --- staged classification: which files a proposal touches (spec §18 M8) ---------
+
+
+def test_preview_changed_paths_reports_edited_file(client, model_dir):
+    from mdl_server.preview import preview_changed_paths
+
+    from mdl_core.repo import ModelRepo
+
+    ce = _ce(client, "counterparty")
+    repo = ModelRepo.load(model_dir)
+    paths = preview_changed_paths(
+        repo, [{"op": "set_definition", "payload": {"id": ce, "definition": "changed."}}]
+    )
+    assert any("conceptual/" in p for p in paths), paths
+    # nothing was written to disk
+    assert (model_dir / "conceptual" / "entities" / "counterparty.yaml").read_text()
+
+
+def _git_init(model_dir):
+    import subprocess
+
+    for a in (
+        ["init", "-q", str(model_dir)],
+        ["-C", str(model_dir), "config", "user.email", "t@t.co"],
+        ["-C", str(model_dir), "config", "user.name", "t"],
+        ["-C", str(model_dir), "add", "-A"],
+        ["-C", str(model_dir), "commit", "-qm", "base"],
+    ):
+        subprocess.run(["git", *a], check=True)
+
+
+def test_staged_classify_routes_a_conceptual_edit(client, model_dir):
+    """A definition edit is a conceptual (Route A) change — and the staged classify
+    sees it even though nothing is on disk yet."""
+    _git_init(model_dir)
+    ce = _ce(client, "counterparty")
+    r = client.post(
+        "/api/git/classify",
+        json={"changes": [{"op": "set_definition", "payload": {"id": ce, "definition": "x."}}]},
+    )
+    assert r.status_code == 200, r.text
+    body = r.json()
+    assert body["ok"] is True
+    assert body["primary"] == "A", body
+    assert any("conceptual/" in p for p in body["paths"]), body
+
+
+def test_staged_classify_rejects_non_list(client):
+    r = client.post("/api/git/classify", json={"changes": "notalist"})
+    assert r.status_code == 422
diff --git a/packages/server/tests/test_propose.py b/packages/server/tests/test_propose.py
index 790d181..c9ccd0e 100644
--- a/packages/server/tests/test_propose.py
+++ b/packages/server/tests/test_propose.py
@@ -59,7 +59,9 @@ def test_propose_creates_branch_and_coauthored_commit(client, git_model_dir):
     assert resp.status_code == 200, resp.text
     data = resp.json()
     assert data["ok"] and data["applied"] == 1
-    assert data["branch"] == "sme/a-hough/clarify-counterparty"
+    # the git-config identity (t@t.co) now authors the proposal, overriding the
+    # self-asserted "a.hough" — this is the §17 identity behaviour.
+    assert data["branch"] == "sme/t-t-co/clarify-counterparty"
     # no origin remote -> graceful message, not an error
     assert data["pushed"] is False
     assert "no `origin` remote" in data["message"]
@@ -69,15 +71,15 @@ def test_propose_creates_branch_and_coauthored_commit(client, git_model_dir):
     # un-merged proposal as truth, and a second propose stacked onto the first.
     assert data["returned_to"] == "main"
     assert _git(git_model_dir, "rev-parse", "--abbrev-ref", "HEAD") == "main"
-    assert "sme/a-hough/clarify-counterparty" in _git(git_model_dir, "branch", "--list", "sme/*")
+    assert "sme/t-t-co/clarify-counterparty" in _git(git_model_dir, "branch", "--list", "sme/*")
     # the commit lives on the branch, so read the log from there
-    log = _git(git_model_dir, "log", "-1", "--pretty=%B", "sme/a-hough/clarify-counterparty")
-    assert "Co-authored-by: a.hough" in log
+    log = _git(git_model_dir, "log", "-1", "--pretty=%B", "sme/t-t-co/clarify-counterparty")
+    assert "Co-authored-by: t <t@t.co>" in log
     assert "prospective parties" in log
     # the edit actually landed
     from mdl_core.repo import ModelRepo
 
-    _git(git_model_dir, "checkout", "sme/a-hough/clarify-counterparty")
+    _git(git_model_dir, "checkout", "sme/t-t-co/clarify-counterparty")
     repo = ModelRepo.load(git_model_dir)
     ce = repo.model.conceptual_entities[cpty["id"]]
     assert "may have" in (ce.definition or "")
@@ -347,3 +349,172 @@ def test_the_hosts_own_link_is_still_preferred_when_present():
     )
     # a re-push prints no such line — this is the case that made scraping unsafe
     assert _pr_url_from_push("To github.com:acme/repo.git\n   abc..def  f -> f\n") is None
+
+
+# --- identity: the server-resolved author overrides a self-asserted string (§17) ---
+
+
+def test_propose_trusts_proxy_identity_over_client_user(git_model_dir, monkeypatch):
+    """A proxy-authenticated user proposing with a DIFFERENT self-asserted body.user
+    must produce a commit attributed to the proxy identity, not the spoofed string."""
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+    from mdl_server.identity import ENV_USER_HEADER
+
+    monkeypatch.setenv(ENV_USER_HEADER, "X-Auth-Request-Email")
+    client = TestClient(create_app(git_model_dir))
+
+    doc = client.get("/api/glossary/terms").json()
+    cpty = next(t for t in doc["terms"] if t["name"] == "Counterparty")
+
+    resp = client.post(
+        "/api/git/propose",
+        headers={"X-Auth-Request-Email": "real.user@corp.com"},
+        json={
+            "user": "impostor",  # self-asserted; must be ignored
+            "slug": "clarify",
+            "title": "Clarify",
+            "changes": [
+                {"op": "set_definition", "payload": {"id": cpty["id"], "definition": "x."}}
+            ],
+        },
+    )
+    assert resp.status_code == 200, resp.text
+    branch = resp.json()["branch"]
+    # branch prefix derives from the proxy identity, not "impostor"
+    assert branch.startswith("sme/real-user-corp-com/")
+    assert "impostor" not in branch
+
+    body = _git(git_model_dir, "log", branch, "-1", "--format=%b")
+    assert "real.user@corp.com" in body
+    assert "impostor" not in body
+
+
+def test_api_model_reports_proxy_identity(git_model_dir, monkeypatch):
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+    from mdl_server.identity import ENV_USER_HEADER
+
+    monkeypatch.setenv(ENV_USER_HEADER, "X-Auth-Request-Email")
+    client = TestClient(create_app(git_model_dir))
+    ident = client.get(
+        "/api/model", headers={"X-Auth-Request-Email": "anita.hough@corp.com"}
+    ).json()["identity"]
+    assert ident["source"] == "proxy"
+    assert ident["name"] == "Anita Hough"
+
+
+def test_api_model_reports_git_identity_solo(client):
+    """No proxy configured: /api/model greets the git-config user (the fixture sets
+    user.name=t / user.email=t@t.co)."""
+    ident = client.get("/api/model").json()["identity"]
+    assert ident["source"] == "git"
+    assert ident["email"] == "t@t.co"
+
+
+def test_propose_solo_still_attributes_without_proxy(client, git_model_dir):
+    """Regression: with no proxy policy, propose attributes to the git-config identity
+    and the flow still succeeds."""
+    doc = client.get("/api/glossary/terms").json()
+    cpty = next(t for t in doc["terms"] if t["name"] == "Counterparty")
+    resp = client.post(
+        "/api/git/propose",
+        json={
+            "user": "a.hough",
+            "slug": "solo-change",
+            "title": "Solo change",
+            "changes": [
+                {"op": "set_definition", "payload": {"id": cpty["id"], "definition": "y."}}
+            ],
+        },
+    )
+    assert resp.status_code == 200, resp.text
+    branch = resp.json()["branch"]
+    # git config identity (t@t.co) wins over the self-asserted "a.hough"
+    assert branch.startswith("sme/t-t-co/")
+    body = _git(git_model_dir, "log", branch, "-1", "--format=%b")
+    assert "t@t.co" in body
+
+
+# --- the MDL_AUTH_REQUIRE write gate (spec §18 M8) --------------------------------
+
+
+def test_propose_403_when_require_and_anonymous(git_model_dir, monkeypatch, tmp_path):
+    """A shared server with MDL_AUTH_REQUIRE refuses an anonymous write with 403,
+    rather than committing under a self-asserted name."""
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+    from mdl_server.identity import ENV_REQUIRE
+
+    # isolate git so the repo has no resolvable identity -> anonymous
+    empty = tmp_path / "empty.gitconfig"
+    empty.write_text("")
+    monkeypatch.setenv("GIT_CONFIG_GLOBAL", str(empty))
+    monkeypatch.setenv("GIT_CONFIG_SYSTEM", str(empty))
+    subprocess.run(["git", "-C", str(git_model_dir), "config", "--unset", "user.name"], check=False)
+    subprocess.run(["git", "-C", str(git_model_dir), "config", "--unset", "user.email"], check=False)
+    monkeypatch.setenv(ENV_REQUIRE, "1")
+
+    client = TestClient(create_app(git_model_dir))
+    doc = client.get("/api/glossary/terms").json()
+    cpty = next(t for t in doc["terms"] if t["name"] == "Counterparty")
+    resp = client.post(
+        "/api/git/propose",
+        json={
+            "user": "anon",
+            "title": "t",
+            "changes": [
+                {"op": "set_definition", "payload": {"id": cpty["id"], "definition": "z."}}
+            ],
+        },
+    )
+    assert resp.status_code == 403, resp.text
+    assert "authenticated identity" in resp.json()["error"]
+    # and no branch was created
+    assert _git(git_model_dir, "branch", "--list", "sme/*") == ""
+
+
+def test_propose_ok_when_require_and_proxy(git_model_dir, monkeypatch):
+    """The same require gate lets a proxy-authenticated user through."""
+    from fastapi.testclient import TestClient
+    from mdl_server import create_app
+    from mdl_server.identity import ENV_REQUIRE, ENV_USER_HEADER
+
+    monkeypatch.setenv(ENV_REQUIRE, "1")
+    monkeypatch.setenv(ENV_USER_HEADER, "X-Auth-Request-Email")
+    client = TestClient(create_app(git_model_dir))
+    doc = client.get("/api/glossary/terms").json()
+    cpty = next(t for t in doc["terms"] if t["name"] == "Counterparty")
+    resp = client.post(
+        "/api/git/propose",
+        headers={"X-Auth-Request-Email": "real@corp.com"},
+        json={
+            "title": "t",
+            "changes": [
+                {"op": "set_definition", "payload": {"id": cpty["id"], "definition": "z."}}
+            ],
+        },
+    )
+    assert resp.status_code == 200, resp.text
+    assert resp.json()["branch"].startswith("sme/real-corp-com/")
+
+
+def test_propose_honours_an_edited_ticket_prefixed_slug(client, git_model_dir):
+    """The Studio branch-name field lets a modeler prepend a ticket id; the server
+    slugifies whatever slug it is handed into the branch, so 'PROJ-123-clarify'
+    becomes sme/<identity>/proj-123-clarify."""
+    doc = client.get("/api/glossary/terms").json()
+    cpty = next(t for t in doc["terms"] if t["name"] == "Counterparty")
+    resp = client.post(
+        "/api/git/propose",
+        json={
+            "slug": "PROJ-123-clarify-counterparty",
+            "title": "Clarify Counterparty",
+            "changes": [
+                {"op": "set_definition", "payload": {"id": cpty["id"], "definition": "x."}}
+            ],
+        },
+    )
+    assert resp.status_code == 200, resp.text
+    # identity (t@t.co) drives the user segment; the edited slug drives the rest
+    assert resp.json()["branch"] == "sme/t-t-co/proj-123-clarify-counterparty"
diff --git a/pyproject.toml b/pyproject.toml
index 2dd68fd..0c15968 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,15 @@ dependencies = [
     "pygls>=2.0",
 ]
 
+# Optional OpenTelemetry export for the audit log (spec §20). `pip install
+# modelith-dbt[audit]` / `uv sync --extra audit` adds it; without it, the audit log
+# still writes its local JSONL file, just no OTLP.
+[project.optional-dependencies]
+audit = [
+    "opentelemetry-sdk>=1.20",
+    "opentelemetry-exporter-otlp-proto-http>=1.20",
+]
+
 # Single `mdl` command. Not exposing a `modelith` script avoids colliding with
 # the unrelated `modelith` package that already exists on PyPI.
 [project.scripts]
diff --git a/uv.lock b/uv.lock
index 514a9e2..d03b259 100644
--- a/uv.lock
+++ b/uv.lock
@@ -87,6 +87,153 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/0b/a7/71ac2cff56fec219ed242bb11b8efb69fcc4bec75db06fb7bfe35de520e6/certifi-2026.7.22-py3-none-any.whl", hash = "sha256:62f22742b58a1a33014a2b6b706588a8d7e2a88ae7bd1a6ebe8c992928483775", size = 136983 },
 ]
 
+[[package]]
+name = "charset-normalizer"
+version = "3.5.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/e5/3f/143b048436775b0f76ac3eec145c019e8173ccc2885c8f20319b996d5e83/charset_normalizer-3.5.1.tar.gz", hash = "sha256:6117b84ea48435e5356dc737f5121485c30920ba43375fa7b434fd753df0eac3", size = 171764 }
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