standalone: rock detail restored in lattice-resolvable bands (4-16 voxels), owner-band gate added

- Relief per wavelength band compared with the owner field; the 4-8 and 8-16 voxel bands were lost.
  Restored within the partition-of-unity blend; max detail gradient 0.545 (limit 0.55).
- New owner-band gate: fails all six views on de14f00, passes all six now.
- W1/W8 44/44; path hash both directions; routes 5642/5642; stair-distance, ring, thin-sheet,
  coarse-panel, far-survival audits pass; bad-shell control fails.
- Cold 1.127 s vs 1.108 s (within spread); nearest-tile readiness 12.20 vs 12.16 ms.
Caveats: the 143-ray GridStair normal audit is at 62.2% vs its 60% limit (was 76.9%); in the tunnel
capture the floor shows a regular dimple pattern, and the passage shaft close-up is still smooth.

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

Standalone/Core/verification/UnrealHeaderCoexistence.cpp

@@ -0,0 +1,16 @@
+#include "Definitions.h"
+#include "CoreMinimal.h"
+#include "VoxelForgeCore/VoxelForgeCore.h"
+
+#include <type_traits>
+
+static_assert(std::is_standard_layout_v<VoxelForgeCore::Vec3d>);
+static_assert(sizeof(VoxelForgeCore::Vec3d)==sizeof(double)*3);
+
+void VoxelForgeCoreUnrealHeaderCoexistenceSmoke()
+{
+    const VoxelForgeCore::Vec3d query{1.0,2.0,3.0};
+    const FVector enginePoint(1.0,2.0,3.0);
+    (void)query;
+    (void)enginePoint;
+}