wip(standalone): GPU step 28 -- skirted near tiles on GPU (correct, but SLOWER); 16 shape workers

Luna: near skirts were CPU-only by implementation gap, not correctness. Ported with
near-resolution refinement and overflow fallback; near-probe preparation split out so
the skirt kernels no longer inline the near field (first attempt: two fxc /O3 compiles
ran 10.5 h and were stopped). Shape compile proven identical at W1/W8/W16.
-SkipCpuDetailBand retired (154/640 skirt audit failures, +174 ms planning).
Audits: hashes W1/W8/W16, walk 5,642/5,642, whole-near 960 tiles + 640 skirt faces
0 sign/topology diffs (one 0.001 cm vertex-key delta), far/thin 0 diffs, both
survivals pass with 2,074 candidates at 7.00 / 7.02 GiB (was ~6.2), ten captures pass.

My runs outside the sandbox (Step28.exe). NOTE the machine was ~25% slower than last
night for every build (step 27 CPU full machine 0.97-1.02 s at night, 1.22-1.29 s now):
  0xFF00: CPU 1.337 / 1.291 / 1.295 s; GPU miss 1.337 s;
          GPU cached 1.663 / 1.424 / 1.617 s (GPU tiles 1,427 / 2,072 / 1,222)
  0xFFFF: CPU 1.221 / 1.231 / 1.236 s (step 27 same session 1.285 / 1.222 s)
          GPU cached 1.582 / 1.550 / 1.416, 1.635 / 1.441 / 1.470 / 1.445 s
          (GPU tiles vary 593-2,074; timestamps up to ~470 ms)
=> GPU route now slower than the CPU route measured alongside it. Step 27 GPU control
   was not clean (both exes load the same precompiled .cso files).

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

Standalone/Source/VoxelForge/Private/VoxelMarchingCubesMesher.cpp

@@ -1783,7 +1783,10 @@ FVoxelMeshData UVoxelMarchingCubesMesher::GenerateMesh(FIntVector OriginVoxels,
                         }
                         if(MaximumProbeDensity>0.25f)
                         {
-                            if(RefinementDepth>=1)continue;
+                            if(RefinementDepth>=1)
+                            {
+                                continue;
+                            }
                             const auto MakeMidpoint=[&](const FSkirtVertex& X,
                                 const FSkirtVertex& Y)
                             {
@@ -1842,9 +1845,9 @@ FVoxelMeshData UVoxelMarchingCubesMesher::GenerateMesh(FIntVector OriginVoxels,
             }
             MeshData.NumSkirtTriangles += (Tris.Num() - BaseTriNum) / 3;
         };
-        EmitSkirts(GroundTris,GroundSkirtFaceMasks);
-        EmitSkirts(CapTris,CapSkirtFaceMasks);
-    }
+            EmitSkirts(GroundTris,GroundSkirtFaceMasks);
+            EmitSkirts(CapTris,CapSkirtFaceMasks);
+        }
 
     // F17 — concatène sol PUIS sky-cap : un run d'indices contigu par polygroup (voir
     // FVoxelMeshData::NumCeilingTriangles). Mêmes triangles qu'avant, seul l'ordre change.