wip(unreal): AVoxelWorld Core mode -- streaming, collision and carving through VoxelForgeCore

Luna, integration round 2 (BuildHost only): AVoxelWorld::bUseVoxelForgeCore (default
false) routes desired tiles, generation, upload/collision and carving through Core.
Core-only CoreClipRadius=3 / CoreMaxClipLevel=8 (owner's asset untouched); 25 cm Core
voxels in every cm<->voxel conversion; legacy brush sizes scaled to keep physical size;
UE-task JobScheduler, epoch-checked Mpsc results, existing RMC upload + collision cook;
carving via sequenced applyEditTransaction. Switch off: BuildDesiredTiles takes the old
path unchanged.
BuildHost proof (actor commandlet, staged copies of the owner's assets): all 2,226
initial tiles hash-match standalone Core; collision bodies as expected; anchor move
requests 1 / releases 1 tile; carved tile hash matches standalone; peak ~2.68 GiB.
Legacy CrossPlatformDigest automation: 115,000 samples pass (wrapper flagged an
analytics write outside isolation).

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

CODEMAP.md

@@ -820,26 +820,33 @@ second density path.
 | `VoxelForgeWormBlockSkipTest.cpp` | `VoxelForge.Determinism.WormBlockSkipSoundness` | Soundness and coverage of the worker-local worm N1 block proof (`voxel.WormBlockSkip`). |
 | `VoxelForgePlayerFitWindow.h` | — | Shared measurement-window policy for player-fit diagnostics (test/editor side only). |
 
-### 3.13 Core module and schema adapter (integration round 1)
+### 3.13 Core runtime integration (round 2)
 The public Core API is linked as the `VoxelForgeCore` runtime module, with canonical implementation
 sources still under `Standalone/`. UBT validates the 18-row manifest and its shims; BuildHost linked
 the module and passed `CheckCoreSymbols.ps1` against the actual shim objects. See
 [`Standalone/UNREAL_INTEGRATION_REPORT.md`](Standalone/UNREAL_INTEGRATION_REPORT.md) for build and
-headless evidence.
+headless evidence and the run ledger.
 
 `RunStandaloneWorldExport` in `VoxelForgeExploreCommandlet.cpp` serializes owner assets on the game
-thread to schema-v1 JSON. `FStandaloneCoreAdapterScheduler` and
-`VerifyStandaloneCoreAdapter` parse that JSON through `ResolvedWorldSnapshot::FromJson`, compile at
-worker limits 1, 8, and 16, and compare the 2,226-tile hashes and passage walkability. The commandlet
-sorts map/set members and JSON object keys to keep the export deterministic. Its test copy applies
-the standalone benchmark view overrides (clip radius 3, max level 8); the saved asset-derived export
-retains the authored clip radius and max level.
+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),
+with independent `CoreClipRadius=3` and `CoreMaxClipLevel=8`; it does not read or mutate the old clip
+settings or assets.
 
-**Runtime status:** no `bUseVoxelForgeCore` property, Core generation route, mesh conversion, Core
-carve transaction, or owner-facing switch instructions exist yet. `AVoxelWorld` still uses the
-existing density generator, mesher, queues, epoch checks, RealtimeMesh upload, and collision path.
-The Core dependency is present so the next round can wire the side-by-side route behind a default-off
-switch while preserving that path.
+When enabled, `AVoxelWorld` uses Core desired keys and priorities, compiles/generates through Unreal
+tasks, carries `Epoch` through the existing MPSC result queues, and uploads converted payloads through
+RealtimeMesh and its collision cook. Core voxel coordinates use 25 cm per voxel; Core tile keys are
+retained, and Core mesh vertices are already in centimetres. High-level legacy brush dimensions are
+scaled from 12.5 cm voxel units to Core units so their physical size stays the same. Edits use
+sequenced `applyEditTransaction` calls after in-flight Core work drains, then regenerate Core's
+affected keys under a new epoch. Existing streaming anchors participate; the headless move proof
+covers `CollisionOnly` policy.
+
+`-coreworldtest=1` in the BuildHost editor commandlet validates the spawned actor's 2,226 initial
+tiles against standalone Core, expected collision bodies/empty tiles, an anchor move, and a carve
+transaction. `VoxelForge.Determinism.CrossPlatformDigest` is the narrow switch-off baseline; it passes,
+but does not instantiate an actor with the switch false. See the report for that limitation and for
+owner-editor instructions.
 
 ## 4. The density pipeline (most-edited hot path)