refactor(M03): extract M2 unique placement registry

docs/modules/world-renderer.md

@@ -5,9 +5,9 @@
 | Field | Value |
 |---|---|
 | Status | Partial |
-| Target/work package | M00 baseline; `M01-RND-STREAMING-FOCUS-001`; `M01-QAR-SERVER-SPAWN-RENDERER-001`; M03 facade/planner/scheduler/internal-access/ground/environment/entity packages; M03 terrain cache/LOD/geometry-queue packages |
+| Target/work package | M00 baseline; `M01-RND-STREAMING-FOCUS-001`; `M01-QAR-SERVER-SPAWN-RENDERER-001`; M03 facade/planner/scheduler/internal-access/ground/environment/entity packages; M03 terrain packages; `M03-RND-M2-UNIQUE-REGISTRY-001` |
 | Owners | Renderer workstream / milestone integrator |
-| Last verified | Worktree `work/sindo-main-codex/m03-terrain-chunk-queue`, 2026-07-16 |
+| Last verified | Worktree `work/sindo-main-codex/m03-m2-unique-registry`, 2026-07-16 |
 | Profiles/capabilities | `Performance`, `Balanced`, `High`, `Custom`; Blizzlike fidelity incomplete |
 
 ## Purpose
@@ -46,6 +46,8 @@ flowchart LR
     ChunkLod --> Loader
     Loader --> ChunkQueue[TerrainChunkGeometryQueuePlanner]
     ChunkQueue --> Loader
+    Loader --> M2Registry[M2UniquePlacementRegistry]
+    M2Registry --> Loader
     Native --> Parsed[Parsed tile/model data]
     Parsed --> Loader
     Loader --> Scene[SceneTree nodes]
@@ -112,6 +114,7 @@ from externally reading/writing loader-private queue, task, cache and tile-state
 | `TerrainQualityMeshCache.store/restore/clear` | Internal terrain service | Owns admitted full-quality revisit Mesh references and LRU | Renderer thread/map session | Rejected/missed entry leaves loader fallback unchanged |
 | `TerrainChunkLodPlanner.plan` | Internal pure terrain query | Maps populated parsed chunk indices to desired LOD 0/1/2 | Synchronous per target refresh | Invalid/disabled input returns empty for existing tile-LOD fallback |
 | `TerrainChunkGeometryQueuePlanner.plan` | Internal pure terrain query | Produces chunk create/remove requests from current and desired state | Synchronous per queue rebuild | Invalid focus returns empty arrays |
+| `M2UniquePlacementRegistry.reserve/release/clear` | Internal M2 service | Owns positive cross-tile ADT placement-ID reservations | Renderer thread/map session | Invalid/unkeyed/non-owner inputs preserve documented fallback |
 
 Публичным contract не считаются `StreamingWorldLoader` methods/properties,
 внутренние dictionaries, queues, job records и generated node names. Scene-owned
@@ -136,6 +139,7 @@ loader configuration remains transitional composition data, not a caller API.
 | Internal cache | Full-quality terrain Mesh/source | Loader terrain upgrade / `TerrainQualityMeshCache` | Revisited tile state | Cache-retained Mesh reference | Map session until eviction/reset |
 | Internal plan | Parsed chunks, typed focus and immutable chunk-LOD policy | Loader / `TerrainChunkLodPlanner` | Loader desired state | Fresh dictionary; no retained resources | One target refresh |
 | Internal plan | Current/desired chunk state and typed focus | Loader / `TerrainChunkGeometryQueuePlanner` | Loader chunk queues | Fresh request arrays; no retained resources | One queue rebuild |
+| Internal registry | Tile key and M2 placement unique IDs | Loader / `M2UniquePlacementRegistry` | Filtered grouping input and tile retry state | Registry-owned strings; fresh result arrays | Map session |
 | Output | Desired tile/detail operations | Streamer plan application | Finalize queues | Loader-owned | Cross-frame |
 | Output | Terrain/M2/WMO/liquid instances | Loader/builders | Godot world/renderer | Loader/world owner | Main-thread attach |
 | Output | Detached renderer metrics | `WorldRenderFacade` | Capture/baseline tools | Caller-owned deep copy | On demand |
@@ -179,6 +183,8 @@ flowchart TD
     ChunkLod --> DesiredChunkLod[Desired chunk LOD state]
     DesiredChunkLod --> ChunkQueue[TerrainChunkGeometryQueuePlanner]
     ChunkQueue --> B
+    R --> M2Registry[M2UniquePlacementRegistry reserve]
+    M2Registry --> M2
     R --> B[RenderBudgetScheduler permits]
     B --> Terrain[Terrain attach/upgrade]
     B --> M2[M2 group/MultiMesh attach]
@@ -290,6 +296,9 @@ sequenceDiagram
 - `TerrainChunkGeometryQueuePlanner` is stateless and owns only call-local
   create/remove request calculation and sorting. The loader adopts the fresh
   arrays and retains removal-first drains, budgets and render side effects.
+- `M2UniquePlacementRegistry` owns only positive unique-key to tile-key strings.
+  The loader retains owned/skipped tile arrays, candidate retry, grouping/build
+  tasks, caches and all MultiMesh/Node/Mesh/material/RID side effects.
 - Rendered-ground query results and diagnostic snapshots are caller-owned values;
   the facade never returns Mesh, Node, tile-state or queue references.
 - Loaded-mesh ground sampling is renderer diagnostics, not authoritative gameplay
@@ -372,6 +381,9 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 - Terrain chunk geometry queue contract: current/desired comparison, tile-LOD
   takeover, sparse origin fallback, stable removals, nearest creates, loader
   drain boundary and bounded multi-tile timing without a world scene.
+- M2 unique placement contract: unkeyed pass-through, within-call/cross-tile
+  dedupe, owner release/retry, clear, detached diagnostics, loader boundary and
+  bounded reserve/release timing without a world scene.
 - Budget scheduler contract: exact lane exhaustion, shared chunk removal/create
   priority, independent lanes, frame reset, invalid limits, terminal cancellation,
   dependency boundaries and bounded permit timing without loading a world scene.
@@ -401,6 +413,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 |---|---|---|---|
 | ADT streaming/terrain | Partial | M00 checkpoints and current scenes | Fidelity/performance gaps remain |
 | Static M2 placement | Partial | MultiMesh/dedupe probes | Full materials/animation/effects |
+| M2 unique placement registry | Implemented extraction | Scene-free ownership/lifecycle/timing contract and historical `uid:11785` smoke | Group/build/tasks/finalization and asset-backed p95/p99 remain pending |
 | WMO rendering | Partial | Cached group rendering | Portals/rooms/material parity |
 | Liquids | Partial | MH2O/MLIQ paths | LiquidType/depth/shore fidelity |
 | Sky/light | Partial | DBC controller/logs | Zone transition paired validation |