wip(assembler): round S2 (Sol) -- shared per-tile feature queries for every Core family; island placement 30x faster

Island-only worker context replaced by a shared worker-local candidate domain
(WorldAssemblyFeatureTileListV1 / ScopedWorldAssemblyFeatureQueriesV1) serving
SurfaceWorld, FloatingIslands and far-shell queries; a per-domain cost hint keeps the
full scan on small plans. Content placement prepares the same queries and skips proven
air: owner island cell p95 7.07 -> 0.24 ms; populated fixture 572 exact placements,
3.27 s -> 29 ms. Full/candidate hashes equal with dropped-feature controls on both
families; S1 default W1/W8/W16 hashes reproduced; Core-off and M2 fixtures pass.
Default contract for future families in ARCHITECTURE 8.23. Run on gpt-6.1-sol medium.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ

Tools/TestVoxelForgeCoreWorldHost.ps1

@@ -12,6 +12,7 @@ param(
     [switch]$MismatchedManifestFallback,
     [switch]$CoreOffTest,
     [switch]$CorePlanOnly,
+    [switch]$SharedFeatureAuditOnly,
     [int]$CoreTestSeed = [int]::MinValue
 )
 
@@ -34,7 +35,8 @@ $DerivedDataCache = Join-Path $PluginRoot 'Saved\BuildHost\VFCoreWorldDDC'
 $ZenData = Join-Path $OutputRoot 'ZenData'
 $EditorCmd = 'E:\Program Files\Epic Games\UE_5.7\Engine\Binaries\Win64\UnrealEditor-Cmd.exe'
 $MemoryLimitBytes = 8GB
-$CrashRoots = @((Join-Path $HostRoot 'Saved\Crashes'), (Join-Path $StagePlugin 'Saved\Crashes'))
+$CrashRoots = @((Join-Path $HostRoot 'Saved\Crashes'), (Join-Path $StagePlugin 'Saved\Crashes'),
+    (Join-Path $UserDirectory 'Saved\Crashes'))
 $CoreSizeSuffix = ''
 if ([Math]::Abs($CoreVoxelSizeCm - 25.0) -gt 0.000001) {
     $CoreSizeText = $CoreVoxelSizeCm.ToString('0.####', [Globalization.CultureInfo]::InvariantCulture)
@@ -127,6 +129,10 @@ if ($HasManifestOverride -and -not (Test-Path -LiteralPath $WorldAssemblyManifes
 }
 
 if ($MismatchedManifestFallback) { $RunName = 'mismatched_fallback' }
+if ($SharedFeatureAuditOnly) {
+    if ($SelectedModeCount -ne 0) { throw '-SharedFeatureAuditOnly uses the SurfaceWorld owner route.' }
+    $RunName = 'shared_feature_audit'
+}
 
 $foreignEditors = @(Get-Process -ErrorAction SilentlyContinue |
     Where-Object { $_.ProcessName -like 'UnrealEditor*' })
@@ -221,7 +227,7 @@ $CoreOffTestFlag = if ($CoreOffTest) { 1 } else { 0 }
 $CorePlanOnlyFlag = if ($CorePlanOnly) { 1 } else { 0 }
 $BaseArguments = @(
     ('-project="{0}"' -f $HostProject),
-    '-nullrhi', '-unattended', '-nop4', '-nosplash', '-NoSound',
+    '-nullrhi', '-unattended', '-nop4', '-nosplash', '-NoSound', '-corelimit=12',
     '-stdout', '-FullStdOutLogOutput', '-forcelogflush', '-NoZenAutoLaunch',
     '-notraceserver', '-nocrashreports', '-ddc=NoZenLocalFallback',
     ('-userdir="{0}"' -f $UserDirectory),
@@ -241,6 +247,7 @@ $BaseArguments = @(
     ("-corehybridfixturesonly=$HybridFixturesOnlyFlag"),
     ('-out="{0}"' -f $OutputDirectory)
 )
+if ($SharedFeatureAuditOnly) { $BaseArguments += '-corefeatureauditonly' }
 if ($HasManifestOverride) {
     $BaseArguments += ('-coreworldassembly="{0}"' -f $StagedWorldAssembly)
 }
@@ -285,6 +292,9 @@ try {
             -RedirectStandardOutput $StdoutPath -RedirectStandardError $StderrPath `
             -WindowStyle Hidden -PassThru
         $Process.PriorityClass = [Diagnostics.ProcessPriorityClass]::Normal
+        # W16 is a logical determinism partition; at most 12 logical CPUs execute host work.
+        # W16 reste un partitionnement logique; limiter l'execution hote a 12 processeurs logiques.
+        $Process.ProcessorAffinity = [IntPtr]0xFFF
         $StartedUtc = [datetime]::UtcNow
         $PeakPrivateBytes = [int64]0
         while (-not $Process.HasExited) {
@@ -351,6 +361,16 @@ if (-not (Test-Path -LiteralPath $FinalLog -PathType Leaf)) {
     $FinalLog = Join-Path $LogDirectory "CoreWorldValidation-$RunName.retry.log"
 }
 $Text = Get-Content -LiteralPath $FinalLog -Raw
+if ($SharedFeatureAuditOnly) {
+    if ($Text -notmatch '\[VoxelForgeSharedFeatureCost\] pass complete=1 warmed_routes=1') {
+        throw "Shared feature audit did not pass: $FinalLog"
+    }
+    if (@(Get-NewCrashFolders).Count -gt 0) { throw 'Shared feature audit produced a new crash folder.' }
+    Write-Host 'VOXELFORGE_SHARED_FEATURE_AUDIT_PASS warmed_routes=1'
+    Write-Host "Core actor log: $FinalLog"
+    Write-Host "Peak commandlet private bytes sampled: $PeakPrivateBytes"
+    return
+}
 if ($CoreFallbackTest) {
     foreach ($Marker in @(
         '[VoxelForgeCoreFallbackTest] fallback=PASS core_disabled=1 legacy_generator=1',