wip(assembler): M1 round 4 PARTIAL -- stopped at owner's request (GPU coil whine at night)

Unverified mid-round state (cliff plates / horizon slab / routes in progress). Resume from here.

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

CODEMAP.md

@@ -827,6 +827,13 @@ the module and passed `CheckCoreSymbols.ps1` against the actual shim objects. Se
 [`Standalone/UNREAL_INTEGRATION_REPORT.md`](Standalone/UNREAL_INTEGRATION_REPORT.md) for build and
 headless evidence and the run ledger.
 
+World assembler field types and `AuditHeightfieldBounds`, `AuditHeightfieldShelfThickness`, and
+`AuditHeightfieldRoute` are declared in
+[`Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h`](Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h)
+and implemented in [`Standalone/Core/src/WorldAssemblerInternal.h`](Standalone/Core/src/WorldAssemblerInternal.h).
+The standalone SurfaceWorld plan composer and capture/audit entry point live in
+[`Standalone/Source/StandaloneViewer.cpp`](Standalone/Source/StandaloneViewer.cpp).
+
 `RunStandaloneWorldExport` in `VoxelForgeExploreCommandlet.cpp` serializes owner assets on the game
 thread to schema-v1 JSON. The adapter parses it through `ResolvedWorldSnapshot::FromJson` and keeps
 UObjects off Core workers. The runtime switch is `AVoxelWorld::bUseVoxelForgeCore` (default false),