unreal: startup boost spans epoch churn; empty collision tiles stay classified (L92)

- Startup apply boost (24 meshes / 14 ms) now ends on initial LOD0-2 + collision readiness or
  the 30 s timeout, not on the first desired-epoch change: FI LOD0-2 settled 3.49 -> 3.40 s.
- Known-empty LOD0 collision classifications persist across unloads within a modification epoch
  and are invalidated on edits; commandlet readiness accepts CollisionNotRequired tiles. The 30 m/s
  movement trace now passes (no re-requests of the 4 support tiles).
- Startup trace events: SerializeResolvedWorld ~466 ms synchronous in BeginPlay (unchanged);
  SW bReady at 2.74 s vs FI 0.75 s (to investigate). Redundant second parse removed.
- Core output identical. Fast tier PASS; Linux UE builds. R42 notes attached.

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

Standalone/Core/src/VoxelForgeCore.cpp

@@ -977,10 +977,10 @@ namespace VoxelForgeCore
     std::optional<ResolvedWorldSnapshot> ResolvedWorldSnapshot::FromJson(
         std::string_view json,std::string& error)
     {
-        auto owner=std::make_shared<FStandaloneOwnerWorld>();
-        if(!StandaloneOwnerLoader::LoadJson(json,*owner,error))return std::nullopt;
         VFJson::Value root;
         if(!VFJson::Parser(std::string(json)).Parse(root,error))return std::nullopt;
+        auto owner=std::make_shared<FStandaloneOwnerWorld>();
+        if(!StandaloneOwnerLoader::Resolve(root,*owner,error))return std::nullopt;
         std::shared_ptr<const WorldAssemblyManifest> worldAssembly;
         if(root.Get("world_assembly").IsObject())
         {