standalone: speed round 3 -- local detail envelope + 8-voxel owner roughness lattice (band ~590 -> ~500 ms)

- Profiled the band: detail noise ~70% of worker time, workers balanced (2.5% spread).
- Local amplitude envelope skips detail on 34% of candidates; owner cave roughness evaluated on
  global 8-voxel Z anchors and interpolated. Detail evaluations 7.07 M -> 3.53 M.
- The field changes slightly (mean channel delta ~1.7-5.4 /255 in the six captures); all look
  audits pass, routes 5642/5642, W1/W8 hashes equal on all nine outputs.
- Whole view 1.953 s @8w full payload: no end-to-end gain shown (stream timing noise ~10%).
- Rejected: detail band radius 5 (fails GridStair).

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

Standalone/Source/StandaloneViewer.cpp

@@ -2047,6 +2047,7 @@ int main(int Argc,char** Argv)
     int32 MaxClipLevelOverride=-1;
     int32 ShapeCompareLevel=-1,ShapeCompareTileLimit=0;
     bool bStreamBenchmark=false;
+    bool bProfileDetailBand=false;
     bool bShardAudit=false;
     bool bStreamHash=false;
     bool bSkipUvAndColors=false;
@@ -2062,6 +2063,7 @@ int main(int Argc,char** Argv)
         const std::string_view Arg=Argv[I];
         if(Arg.starts_with("--capture="))App.CapturePath=std::string(Arg.substr(10));
         else if(Arg=="--profile-attribution")App.bProfileAttribution=true;
+        else if(Arg=="--profile-detail-band")bProfileDetailBand=true;
         else if(Arg=="--compare-evaluators")App.bCompareEvaluators=true;
         else if(Arg=="--parity-only")App.bParityOnly=true;
         else if(Arg=="--density-hash")App.bDensityHash=true;
@@ -2131,6 +2133,7 @@ int main(int Argc,char** Argv)
         }
         else if(!Arg.empty()&&Arg.front()!='-')App.DataPath=std::string(Arg);
     }
+    FStandaloneShapeWorld::SetDetailProfileEnabled(bProfileDetailBand);
     std::string Error;
     App.World=std::make_unique<FStandaloneOwnerWorld>();
     if(!StandaloneOwnerLoader::Load(App.DataPath,*App.World,Error)){std::fprintf(stderr,"Owner data load failed: %s\n",Error.c_str());return 2;}