feat(streaming): shadow-publish flat collision assets

Carry one immutable prepared collision closure with each accepted near-tier generation and install graph plus flat views through the same retained publication receipt. Apply the same strict package-only rule to live entities, add exact sampled graph-authoritative comparison artifacts and lifecycle counters, and prove cancellation, demotion, rehydrate, revisit, teardown, reconnect, and the nine-stop route with 14,064 zero-mismatch samples.

Co-authored-by: OpenAI Codex <codex@openai.com>

tools/run-connected-r6-soak.ps1

@@ -8,7 +8,8 @@ param(
     [switch]$DenseTown,
     [switch]$CaptureContention,
     [switch]$SkipRuntimeCounters,
-    [int]$LoginTimeoutSeconds = 90
+    [int]$LoginTimeoutSeconds = 90,
+    [int]$CollisionShadowEvery = 0
 )
 
 Set-StrictMode -Version Latest
@@ -67,6 +68,7 @@ $markerLog = "$prefix.markers.log"
 $sampleCsv = "$prefix.samples.csv"
 $reportJson = "$prefix.report.json"
 $artifactDir = "$prefix.artifacts"
+$collisionShadowDir = Join-Path $artifactDir 'collision-shadow'
 $checkpointTimeline = Join-Path $artifactDir 'world-lifecycle.checkpoints.jsonl'
 $frameHistory = Join-Path $artifactDir 'frame-history.csv'
 $frameSummary = Join-Path $artifactDir 'frame-history-summary.json'
@@ -440,6 +442,26 @@ function Add-CanonicalCheckpointFailures([Diagnostics.Process]$Client) {
             }
         }
 
+        if ($CollisionShadowEvery -gt 0) {
+            $shadow = $checkpoint.resources.PSObject.Properties['collisionShadow']
+            if ($null -eq $shadow) {
+                $failures.Add("canonical checkpoint '$expectedName' is missing resources.collisionShadow")
+            }
+            else {
+                foreach ($field in @('mismatches', 'faults')) {
+                    $property = $shadow.Value.PSObject.Properties[$field]
+                    if ($null -eq $property) {
+                        $failures.Add(
+                            "canonical checkpoint '$expectedName' is missing resources.collisionShadow.$field")
+                    }
+                    elseif ([long]$property.Value -ne 0) {
+                        $failures.Add(
+                            "canonical checkpoint '$expectedName' has resources.collisionShadow.$field=$($property.Value), expected zero")
+                    }
+                }
+            }
+        }
+
         $streamingWork =
             $checkpoint.resources.PSObject.Properties['streamingWork']
         if ($null -eq $streamingWork) {
@@ -753,6 +775,10 @@ $env:ACDREAM_AUTOMATION_ARTIFACT_DIR = $artifactDir
 $env:ACDREAM_DUMP_MOVE_TRUTH = '1'
 $env:ACDREAM_NO_AUDIO = $null
 $env:ACDREAM_WB_DIAG = $null
+$env:ACDREAM_COLLISION_SHADOW_EVERY =
+    if ($CollisionShadowEvery -gt 0) { "$CollisionShadowEvery" } else { $null }
+$env:ACDREAM_COLLISION_SHADOW_DIR =
+    if ($CollisionShadowEvery -gt 0) { $collisionShadowDir } else { $null }
 
 # Machine-readable disclosure of the exact launch configuration (2026-07-24
 # measurement-tooling review — the prior audit could only see
@@ -781,6 +807,7 @@ $envDisclosure = [pscustomobject][ordered]@{
     DenseTown = [bool]$DenseTown
     CaptureContention = [bool]$CaptureContention
     RuntimeCounters = -not [bool]$SkipRuntimeCounters
+    CollisionShadowEvery = $CollisionShadowEvery
     Route = $routeFileName
     EnvironmentVariables = @($acdreamEnvVars)
 }
@@ -897,6 +924,25 @@ try {
         30
     $canonicalCheckpoints = @(Read-CanonicalCheckpoints)
     Add-CanonicalCheckpointFailures $process
+    if ($CollisionShadowEvery -gt 0 -and $canonicalCheckpoints.Count -gt 0) {
+        $lastShadow =
+            $canonicalCheckpoints[-1].resources.PSObject.Properties['collisionShadow']
+        $shadowSamples = if ($null -ne $lastShadow) {
+            $lastShadow.Value.PSObject.Properties['samples']
+        }
+        if ($null -eq $shadowSamples -or [long]$shadowSamples.Value -le 0) {
+            $failures.Add('collision shadow did not sample any query')
+        }
+        $mismatchArtifacts = @(
+            Get-ChildItem -LiteralPath $collisionShadowDir `
+                -Filter 'collision-shadow-*.json' `
+                -File `
+                -ErrorAction SilentlyContinue)
+        if ($mismatchArtifacts.Count -ne 0) {
+            $failures.Add(
+                "collision shadow emitted $($mismatchArtifacts.Count) mismatch artifact(s)")
+        }
+    }
     if (-not $DenseTown) {
         Add-RelativeGateFailures
     }
@@ -980,6 +1026,7 @@ finally {
         BinaryCommit = $binaryCommit
         BinaryMatchesSource = $binaryMatchesSource
         SessionName = $env:SESSIONNAME
+        CollisionShadowEvery = $CollisionShadowEvery
         ExitCode = $exitCode
         GracefulExit = $gracefulExit
         Failures = @($failures)