passages: exact relief skip + per-tile BVH node masks (L82); FI/TN LOD0-2 -12%

- Wall relief noise is skipped when its hard-bounded contribution cannot change the final max;
  mouth surface/tread noise only on paths that use it.
- Exact active BVH-node masks cached per tile/passage/segment range; no per-sample lower_bound.
- Full-view audit imports the exported Core plan (not the stale 26-point root route): 21,425/21,425
  walkability samples pass.
Cold (L80 protocol, medians) LOD0-2: SW 1.16->1.11, FI 2.86->2.51, TN 2.88->2.54, VS 1.23->1.22 s.
Passage share FI 64.6->58.7%, TN 65.4->58.4%. Hashes identical (v214). TN "slowdown" from L81
not reproduced (5 pairs, 3.08 -> 2.75 s). 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

Standalone/Core/src/StandaloneSnapshotAdapter.h

@@ -11,5 +11,6 @@ namespace VoxelForgeCore
     // the same command-line overrides as the viewer's reference loader.
     ResolvedWorldSnapshot MakeStandaloneSnapshotFromParsedJson(const VFJson::Value& jsonRoot,
         std::int32_t seed,std::int32_t clipRadius,std::int32_t maxLodOverride,
-        bool roundTunnels,bool enhancedTunnelWalls,std::string& error);
+        bool roundTunnels,bool enhancedTunnelWalls,std::string& error,
+        bool hasUnrealResolvedCorePlan=false);
 }