fix(unreal): U1 -- Unreal compiles again on L61; CoreGeometry asset section; versioned layout-unit upgrade

Windows MSVC catch-up after abyss L15-L61 (no Unreal there): 64-bit clipmap
shift (C4334), qualified VoxelForgeCore::WorldAssemblySubvoxelsPerVoxel, UHT
metadata and duplicate-signature fixes. Optional CoreGeometry section on
UVoxelStrateDefinition (native caves, lattice, profiled heightfields, named
stamps, rooms/tunnels; off/empty by default), resolved after passage planning.
VoxelForgeAssetVersion 2 converts strate height/transition/gap to metres on
load (exact, 0 m change on the owner's 5 assets; packages never saved).
Gates pass (SurfaceWorld, FloatingIslands, Core-off, M2, W1/W8/W16).
KNOWN REGRESSION vs L14 (2026-10-20, same command, same PC): full set 3.9 ->
5.37 s, worker-seconds 15.8 -> 30, LOD0 1.11 -> 1.69 s, ring 0.50 -> 0.80 s;
not yet attributed (Core L15-L61 vs Unreal side).
Report: Standalone/Research/WorldAssemblerM3/Unreal1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Source/VoxelForge/Private/Tests/VoxelForgeTestFixture.h

@@ -79,6 +79,8 @@ namespace VoxelForgeTest
                 NewObject<UVoxelSettings>(GetTransientPackage(), NAME_None, RF_Transient));
             Settings->Seed = InSeed;
             Settings->InterStrateGapChunks = InGapChunks;
+            Settings->InterStrateGapMeters = static_cast<double>(InGapChunks)
+                * Settings->StrateLayoutChunkSizeMeters;
             // WorldRadiusVoxels/EdgeSealThickness intentionally inherit the UVoxelSettings defaults;
             // WorldEdgeSeal overrides them explicitly when it needs a small test world or radius 0.
 
@@ -110,6 +112,8 @@ namespace VoxelForgeTest
                 // refinement and roll tests use the smaller synthetic volume as a bounded memory
                 // control; the owner-facing showcase opts into 8 chunks below.
                 Def->StrateHeightInChunks = FMath::Max(1, InStrateHeightInChunks);
+                Def->StrateHeightMeters = static_cast<double>(Def->StrateHeightInChunks)
+                    * Settings->StrateLayoutChunkSizeMeters;
                 // Hard transitions: param blending across a boundary would make "which archetype
                 // owns this chunk" ambiguous, and these tests want an unambiguous mapping.
                 Def->TransitionType = EVoxelStrateTransition::Hard;