unreal: deeper ready queue keeps the 8 tile workers fed (L95); SW near set 2.37 -> 1.31 s

Unreal per-tile timeline: per-tile Core work is not slower than headless (FI 11.2 vs 16.2 ms
per shared key); the gap was tick-paced admission with a small queue (FI ~5.2 of 8 slots busy).
voxel.StreamingReadyQueueDepth default 16 -> 64 (effective 32 with 8 slots, total cap 40);
result backlog cap 256 unchanged. First admission -> LOD0-2 settled: FI 2.72 -> 2.10 s,
SW 2.37 -> 1.31 s (3 of 4 runs; one 6.9 s outlier re-admitting 3 LOD0 keys, cause open).
apply_ms max 4.2 ms (14 ms budget). Frame-interval max 118-145 ms both before and after (open).
World unchanged. Fast tier PASS; Linux UE host builds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Source/VoxelForge/Private/VoxelWorld.cpp

@@ -248,7 +248,7 @@ namespace
         GVoxelForgeStreamingResultBacklogCap,
         TEXT("Maximum queued results plus admitted tile tasks; 0 disables the safety cap. This is separate from the worker-slot cap."));
 
-    int32 GVoxelForgeStreamingReadyQueueDepth = 16;
+    int32 GVoxelForgeStreamingReadyQueueDepth = 64;
     FAutoConsoleVariableRef CVarVoxelForgeStreamingReadyQueueDepth(
         TEXT("voxel.StreamingReadyQueueDepth"),
         GVoxelForgeStreamingReadyQueueDepth,
@@ -7658,6 +7658,31 @@ bool AVoxelWorld::InitializeVoxelForgeCoreWorld(FString& OutFailureReason)
     const bool bSnapshotSerialized = VoxelForgeCoreAdapter::SerializeResolvedWorld(
             Settings, StrateManager, ActiveCoreClipRadius, ActiveCoreMaxClipLevel,
             ActiveCoreVoxelSizeCm, Json, ExportError);
+    FString CoreSnapshotOutputPath;
+    if (bSnapshotSerialized
+        && FParse::Value(FCommandLine::Get(),
+            TEXT("voxel.StartupTraceCoreSnapshotFile="), CoreSnapshotOutputPath))
+    {
+        CoreSnapshotOutputPath.TrimQuotesInline();
+        if (!CoreSnapshotOutputPath.IsEmpty())
+        {
+            if (FFileHelper::SaveStringToFile(Json, *CoreSnapshotOutputPath,
+                    FFileHelper::EEncodingOptions::ForceUTF8WithoutBOM))
+            {
+                VoxelForgeStartupTrace::RecordEvent(TEXT("core_snapshot_export"), FString::Printf(
+                    TEXT("\"path\":\"%s\",\"json_chars\":%d"),
+                    *CoreSnapshotOutputPath.ReplaceCharWithEscapedChar(), Json.Len()));
+            }
+            else
+            {
+                UE_LOG(LogTemp, Error,
+                    TEXT("[VoxelForgeCoreRuntime] Could not write diagnostic Core snapshot to %s"),
+                    *CoreSnapshotOutputPath);
+                OutFailureReason = TEXT("diagnostic Core snapshot export failed");
+                return false;
+            }
+        }
+    }
     if (bTraceCoreStartup)
     {
         const double SnapshotSerializeEndSeconds = FPlatformTime::Seconds();