diff --git a/contracts/barc-stock-queue-v1/contract.json b/contracts/barc-stock-queue-v1/contract.json
index ccf5c2b..b34f4b3 100644
--- a/contracts/barc-stock-queue-v1/contract.json
+++ b/contracts/barc-stock-queue-v1/contract.json
@@ -3,9 +3,9 @@
   "owner": "FS-GG/HighBarV3",
   "consumer": "FS-GG/FSBarV2",
   "stockEngine": {
-    "sourceCommit": "2639eedac7d1fd67d793ec93ebd27f014f336a14",
-    "headlessSha256": "e4f63c1a391f9ddfbb4d1da225d9533b1d56c65133687d036422a7380c84e833",
-    "release": "2025.06.19"
+    "sourceCommit": "de69361239d8c8b1012dba3f5aa3122954ea4da3",
+    "headlessSha256": "651d6dca67ad99fde1a593d57eede0dfee167e200558988f154ad2bac1cfce21",
+    "release": "2026.07.04"
   },
   "profiles": {
     "legacy": {
diff --git a/docs/roadmaps/barc-01-useful-play.md b/docs/roadmaps/barc-01-useful-play.md
index 9057632..3092e6c 100644
--- a/docs/roadmaps/barc-01-useful-play.md
+++ b/docs/roadmaps/barc-01-useful-play.md
@@ -10,6 +10,30 @@ The stock queue observation contract reports the actual fields supported by the
 
 The linked custom atomic-replacement experiment remains optional and open, with its all-or-none nonempty replacement, cancellation/refund, synchronized fence and independent peer proof requirements unchanged. Its native 0/6 and preserved custom artifacts are not stock acceptance. BARC-01.5 stock useful-play acceptance also remains open until new exact-profile local/generated pointer, keyboard and imported-module native journeys pass.
 
+## Selected stock engine update — 2026-10-02
+
+The owner selected unmodified Recoil **2026.07.04**, upstream source
+`de69361239d8c8b1012dba3f5aa3122954ea4da3`, to replace 2025.06.19 for the
+next product candidate. Official amd64 Linux archive SHA-256:
+`9824c2c38124e4b90a9b5f7c4e7200c3ea6503c0bd4bff0e0ff46212ec29dcab`;
+extracted headless SHA-256:
+`651d6dca67ad99fde1a593d57eede0dfee167e200558988f154ad2bac1cfce21`.
+The separate candidate installation actually reports
+`spring-headless version 2026.07.04 (Headless)`.
+
+The [upstream headless atlas guard](https://github.com/beyond-all-reason/RecoilEngine/blob/de69361239d8c8b1012dba3f5aa3122954ea4da3/rts/Rendering/Textures/TextureRenderAtlas.cpp#L389)
+addresses the retry function found in the failed old-engine attempt. An actual
+successor run must establish its local effect; acquisition and version checks
+alone do not close the atlas incident, Lua errors, Count1 or native useful play.
+
+The producer pin, closed version tuple, stock trace and build source pin must
+agree with the consumer contract and native catalogue readiness. Historical
+2025.06.19 attempts and hash-algorithm vectors stay unchanged. Source adoption
+precedes a freshly joined plugin/engine/private-runtime candidate; installed
+old packets never become new-engine evidence. The stock tactical wire revision
+and factory/queue promises are unchanged, and useful-play acceptance remains 0/6.
+See the [qualification plan](https://github.com/FS-GG/.github/blob/main/docs/roadmaps/2026-10-02-bar-headless-infolog-qualification.md).
+
 ## Current frontier — 2026-10-01
 
 Selected product profile: unmodified Recoil2025.06.19 plus the ABI-matched HighBar plugin and bounded synced Lua queue observer. Delivered default source heads are HighBar `f08555372168cd911f438de0be5ec2898fd1cfb5` and FSBar `6b9139e83334da903ea6861adb57d97578af2239`; neither source merge establishes installation or gameplay acceptance. The existing custom FR1–FR6 experiment remains optional, inactive and open.
diff --git a/tests/Broker.NativeProof/LiveHost.fs b/tests/Broker.NativeProof/LiveHost.fs
index f8b7cef..f70efd6 100644
--- a/tests/Broker.NativeProof/LiveHost.fs
+++ b/tests/Broker.NativeProof/LiveHost.fs
@@ -223,7 +223,7 @@ module LiveHost =
                         let catalogue = LiveControl.latestTacticalCatalogue state |> Option.defaultWith(fun () -> invalidOp "stock readiness lost its complete catalogue")
                         let tactical = stockSelection |> Option.map(fun selection -> selection.Tactical) |> Option.defaultWith(fun () -> invalidOp "stock readiness lost its retained factory selection")
                         if capabilities.Profile<>profile || capabilities.Revision<>2u then invalidOp "stock readiness requires exact profile revision 2"
-                        if List.isEmpty catalogue || catalogue |> List.exists(fun page -> page.TacticalProfile<>profile || page.TacticalRevision<>2u || not page.Complete || page.CatalogueId.Length<>16 || page.CatalogueRevision=0UL || page.Content |> ValueOption.exists(fun content -> content.EngineVersion="2025.06.19" && not(String.IsNullOrWhiteSpace content.GameName) && not(String.IsNullOrWhiteSpace content.GameVersion) && content.GameContentSha256.Length=32) |> not) then invalidOp "stock readiness requires complete current catalogue/content identity"
+                        if List.isEmpty catalogue || catalogue |> List.exists(fun page -> page.TacticalProfile<>profile || page.TacticalRevision<>2u || not page.Complete || page.CatalogueId.Length<>16 || page.CatalogueRevision=0UL || page.Content |> ValueOption.exists(fun content -> content.EngineVersion="2026.07.04" && not(String.IsNullOrWhiteSpace content.GameName) && not(String.IsNullOrWhiteSpace content.GameVersion) && content.GameContentSha256.Length=32) |> not) then invalidOp "stock readiness requires complete current catalogue/content identity"
                         if tactical.Basis |> ValueOption.exists(fun basis -> basis.Token.Length>0 && basis.MatchIncarnation.Length=16 && basis.StateSequence>0UL && basis.SnapshotSendMonotonicNs>0UL) |> not || tactical.CatalogueId.Length<>16 || tactical.CatalogueRevision=0UL || tactical.Actors.Count=0 then invalidOp "stock readiness requires current basis, catalogue and actor metadata"
                         let queues=tactical.Actors |> Seq.collect(fun actor -> actor.Queue) |> Seq.toArray
                         if queues.Length=0 || queues |> Seq.exists(fun queue -> int queue.EvidenceScheme<>2) then invalidOp "stock readiness requires queue evidence scheme 2"
diff --git a/tests/Broker.NativeProof/stock-native-trace.mjs b/tests/Broker.NativeProof/stock-native-trace.mjs
index 3ab0d0b..9408bc7 100644
--- a/tests/Broker.NativeProof/stock-native-trace.mjs
+++ b/tests/Broker.NativeProof/stock-native-trace.mjs
@@ -51,7 +51,7 @@ export function computeStockRevision(context,rows){
 }
 
 const validateBasis=value=>{exactKeys(value,["token","stateSequence","frame","matchIncarnation","processIncarnation","stateChannelIncarnation","snapshotSendMonotonicNs","effectiveCadenceFrames"],"native basis");insist(canonicalBase64(value.token,1,64)&&decimal(value.stateSequence,{positive:true})&&uint32(value.frame)&&canonicalBase64(value.matchIncarnation,16,16)&&nonempty(value.processIncarnation)&&nonempty(value.stateChannelIncarnation)&&decimal(value.snapshotSendMonotonicNs,{positive:true})&&Number.isInteger(value.effectiveCadenceFrames)&&value.effectiveCadenceFrames>0&&value.effectiveCadenceFrames<=0xffffffff,"native basis is incomplete")};
-const validateContext=value=>{exactKeys(value,["profile","tacticalRevision","queueEvidenceScheme","actor","catalogueId","catalogueRevision","engineVersion","gameName","gameVersion","contentSha256","domain"],"stock context");exactKeys(value.actor,["id","lifetime"],"stock actor");insist(value.profile==="barc-live-tactical-stock-v1"&&value.tacticalRevision===2&&value.queueEvidenceScheme===2&&decimal(value.actor.id)&&BigInt(value.actor.id)<=31999n&&decimal(value.actor.lifetime,{positive:true})&&canonicalBase64(value.catalogueId,16,16)&&decimal(value.catalogueRevision,{positive:true})&&value.engineVersion==="2025.06.19"&&nonempty(value.gameName)&&nonempty(value.gameVersion)&&sha256.test(value.contentSha256)&&["production","rally"].includes(value.domain),"stock context identity changed")};
+const validateContext=value=>{exactKeys(value,["profile","tacticalRevision","queueEvidenceScheme","actor","catalogueId","catalogueRevision","engineVersion","gameName","gameVersion","contentSha256","domain"],"stock context");exactKeys(value.actor,["id","lifetime"],"stock actor");insist(value.profile==="barc-live-tactical-stock-v1"&&value.tacticalRevision===2&&value.queueEvidenceScheme===2&&decimal(value.actor.id)&&BigInt(value.actor.id)<=31999n&&decimal(value.actor.lifetime,{positive:true})&&canonicalBase64(value.catalogueId,16,16)&&decimal(value.catalogueRevision,{positive:true})&&value.engineVersion==="2026.07.04"&&nonempty(value.gameName)&&nonempty(value.gameVersion)&&sha256.test(value.contentSha256)&&["production","rally"].includes(value.domain),"stock context identity changed")};
 const validateQueue=(value,context,response)=>{exactKeys(value,["revision","entries"],"stock queue");insist(decimal(value.revision,{positive:true})&&Array.isArray(value.entries)&&value.entries.length<=64,"stock queue bound changed");let params=0;for(const entry of value.entries){exactKeys(entry,["id","codedOptions","tag","float32params"],"stock queue entry");insist(int32(entry.id)&&Number.isInteger(entry.codedOptions)&&entry.codedOptions>=0&&entry.codedOptions<=65535&&int32(entry.tag)&&Array.isArray(entry.float32params)&&entry.float32params.length<=16&&entry.float32params.every(finiteBits),"stock queue entry changed");params+=entry.float32params.length}insist(params<=256,"stock queue parameter bound changed");const expanded=value.entries.map(entry=>({domain:context.domain,...entry}));insist(equal(expanded,response.rows)&&value.revision===computeStockRevision(context,expanded),"stock queue response or scheme2 revision changed")};
 const validateDispatch=value=>{exactKeys(value,["brokerSessionId","commandChannelIncarnation","batchSequence","correlationId","commandIndex","authorityEpoch","moduleSha256","moduleGeneration","expectedQueueRevision","matched"],"stock dispatch");insist(canonicalBase64(value.brokerSessionId,16,16)&&nonempty(value.commandChannelIncarnation)&&decimal(value.batchSequence,{positive:true})&&decimal(value.correlationId,{positive:true})&&uint32(value.commandIndex)&&decimal(value.authorityEpoch,{positive:true})&&sha256.test(value.moduleSha256)&&decimal(value.moduleGeneration,{positive:true})&&decimal(value.expectedQueueRevision,{positive:true})&&typeof value.matched==="boolean","stock dispatch identity changed")};
 
diff --git a/tests/Broker.NativeProof/stock-native-trace.test.mjs b/tests/Broker.NativeProof/stock-native-trace.test.mjs
index 4e2b106..f7df2ba 100644
--- a/tests/Broker.NativeProof/stock-native-trace.test.mjs
+++ b/tests/Broker.NativeProof/stock-native-trace.test.mjs
@@ -11,16 +11,23 @@ import { computeStockRevision, joinStockFinalRead, materializeStockHandoff, norm
 const request="BARC_QUEUE_REQUEST/1\nlength=00000101\nbridge=barc-stock-queue-reader-v1\ndomain=production\nunit=42\nend\n";
 const response="BARC_QUEUE_RESPONSE/1\nlength=00000244\nbridge=barc-stock-queue-reader-v1\nrequest-sha256=b01b44c1eaea587730eae794c0b87e4e05dddecfb508abd295ac1e138a0f5960\nstatus=ok\ndomain=production\nunit=42\ncount=1\nrow=production|-710|32|41|3f800000,80000000\nend\n";
 const catalogueId=Buffer.from(Array.from({length:16},(_,index)=>index)).toString("base64"),matchId=Buffer.from(Array.from({length:16},(_,index)=>index+16)).toString("base64");
-const context=()=>({profile:"barc-live-tactical-stock-v1",tacticalRevision:2,queueEvidenceScheme:2,actor:{id:"42",lifetime:"9007199254741105"},catalogueId,catalogueRevision:"9007199254741107",engineVersion:"2025.06.19",gameName:"BAR",gameVersion:"test-29926-0571aa8",contentSha256:"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",domain:"production"});
+const context=()=>({profile:"barc-live-tactical-stock-v1",tacticalRevision:2,queueEvidenceScheme:2,actor:{id:"42",lifetime:"9007199254741105"},catalogueId,catalogueRevision:"9007199254741107",engineVersion:"2026.07.04",gameName:"BAR",gameVersion:"test-29926-0571aa8",contentSha256:"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",domain:"production"});
 const nativeBasis=(sequence="20",frame=20)=>({token:Buffer.from("basis-token").toString("base64"),stateSequence:sequence,frame,matchIncarnation:matchId,processIncarnation:"process-1",stateChannelIncarnation:"channel-1",snapshotSendMonotonicNs:"9007199254742000",effectiveCadenceFrames:2});
-const dispatch=()=>({brokerSessionId:Buffer.from(Array(16).fill(9)).toString("base64"),commandChannelIncarnation:"command-channel-1",batchSequence:"91",correlationId:"92",commandIndex:7,authorityEpoch:"3",moduleSha256:"a".repeat(64),moduleGeneration:"4",expectedQueueRevision:"18145486220354098388",matched:true});
-const record=(phase="sample",basis=nativeBasis())=>({schema:"highbar.barc-stock-queue-trace/v1",runId:"stock-run",sequence:"1",phase,readFrame:21,perspectiveTeamId:0,nativeBasis:basis,context:context(),reader:{kind:"CallRules",status:"complete",request,response},queue:{revision:"18145486220354098388",entries:[{id:-710,codedOptions:32,tag:41,float32params:["3f800000","80000000"]}]},dispatch:phase==="sample"?null:dispatch()});
+const dispatch=()=>({brokerSessionId:Buffer.from(Array(16).fill(9)).toString("base64"),commandChannelIncarnation:"command-channel-1",batchSequence:"91",correlationId:"92",commandIndex:7,authorityEpoch:"3",moduleSha256:"a".repeat(64),moduleGeneration:"4",expectedQueueRevision:"11858024252242068063",matched:true});
+const record=(phase="sample",basis=nativeBasis())=>({schema:"highbar.barc-stock-queue-trace/v1",runId:"stock-run",sequence:"1",phase,readFrame:21,perspectiveTeamId:0,nativeBasis:basis,context:context(),reader:{kind:"CallRules",status:"complete",request,response},queue:{revision:"11858024252242068063",entries:[{id:-710,codedOptions:32,tag:41,float32params:["3f800000","80000000"]}]},dispatch:phase==="sample"?null:dispatch()});
 const browserBasis=basis=>canonicalObject(v1.ObservationBasis,encodeObject(v1.ObservationBasis,{token:basis.token,stateSequence:basis.stateSequence,nativeFrame:basis.frame,matchId:basis.matchIncarnation,processIncarnation:basis.processIncarnation,stateChannelIncarnation:basis.stateChannelIncarnation}));
-const observations=basis=>({host:{nativeBasis:basis,actor:{id:"42",lifetime:"9007199254741105"},catalogue:{id:catalogueId,revision:"9007199254741107",contentSha256:context().contentSha256}},browser:{basis:browserBasis(basis),tactical:{actors:[{actor:{id:"42",lifetime:"9007199254741105"},queue:[{domain:"QUEUE_DOMAIN_FACTORY_PRODUCTION",revision:"18145486220354098388",complete:true,evidenceScheme:"NATIVE_QUEUE_EVIDENCE_SCHEME_STOCK_LUA_SUPPORTED_FIELDS_V1"}]}]}}});
+const observations=basis=>({host:{nativeBasis:basis,actor:{id:"42",lifetime:"9007199254741105"},catalogue:{id:catalogueId,revision:"9007199254741107",contentSha256:context().contentSha256}},browser:{basis:browserBasis(basis),tactical:{actors:[{actor:{id:"42",lifetime:"9007199254741105"},queue:[{domain:"QUEUE_DOMAIN_FACTORY_PRODUCTION",revision:"11858024252242068063",complete:true,evidenceScheme:"NATIVE_QUEUE_EVIDENCE_SCHEME_STOCK_LUA_SUPPORTED_FIELDS_V1"}]}]}}});
 const codec={canonicalObject,encodeObject,v1};
 
 test("scheme2 revision vector and actual production codec normalization preserve signed zero",()=>{
-  const value=record();assert.equal(computeStockRevision(value.context,[{domain:"production",...value.queue.entries[0]}]),"18145486220354098388");const actual=observations(value.nativeBasis),normalized=normalizeStockSample(value,actual.host,actual.browser,codec);assert.equal(normalized.value.entries[0].float32params[1],"80000000");assert.deepEqual(normalized.value.basis,actual.browser.basis);assert.equal(normalized.value.catalogueId,catalogueId);
+  const value=record();assert.equal(computeStockRevision(value.context,[{domain:"production",...value.queue.entries[0]}]),"11858024252242068063");const actual=observations(value.nativeBasis),normalized=normalizeStockSample(value,actual.host,actual.browser,codec);assert.equal(normalized.value.entries[0].float32params[1],"80000000");assert.deepEqual(normalized.value.basis,actual.browser.basis);assert.equal(normalized.value.catalogueId,catalogueId);
+});
+
+test("selected engine admission refuses the historical profile while its revision golden remains reproducible",()=>{
+  const historical={...context(),engineVersion:"2025.06.19"};
+  assert.equal(computeStockRevision(historical,[{domain:"production",...record().queue.entries[0]}]),"18145486220354098388");
+  const stale=record();stale.context=historical;stale.queue.revision="18145486220354098388";
+  assert.throws(()=>validateStockTraceRecord(stale),/stock context identity changed/);
 });
 
 test("stock trace parsing is closed, contiguous and complete",()=>{