refactor(M03): extract WMO placement registry

RENDER.md

@@ -27,6 +27,8 @@ Paired run 2026-07-11 подтвердил крупный coordinate/placement g
 
 - `src/render/world_render_facade.gd` - стабильная граница runtime/tools для focus и metrics.
 - `src/scenes/streaming/streaming_world_loader.gd` - внутренний runtime streamer мира.
+- `src/render/wmo/wmo_placement_resolver.gd` - value-only WMO path, identity and transform rules.
+- `src/render/wmo/wmo_placement_registry.gd` - WMO placement-key to tile/global reference sets; Nodes and render jobs remain in the streamer.
 - `src/scenes/streaming/eastern_kingdoms_streaming.tscn` - текущая сцена для проверки Azeroth/Eastern Kingdoms.
 - `addons/mpq_extractor/loaders/adt_builder.gd` - сборка ADT terrain, control splat материалов и MH2O liquids.
 - `addons/mpq_extractor/loaders/m2_builder.gd` - сборка статического M2 mesh/material.
@@ -394,6 +396,8 @@ Known limits:
 - `WMOBuilder` строит group meshes;
 - runtime registry дедуплицирует WMO по `unique_id`;
 - WMO на границе ADT не дублируются;
+- `WmoPlacementRegistry` owns only placement reference sets; the streamer keeps
+  the parallel key-to-Node map and performs final-release cancellation/free;
 - большие WMO не должны инстанцироваться как тяжелые `.tscn` во время движения;
 - добавлен lightweight render-cache path для WMO groups;
 - `wmo_render_group_ops_per_tick` ограничивает подключение WMO groups по кадрам;

docs/modules/README.md

@@ -20,6 +20,7 @@
 | M2 placement grouper | Implemented extraction | [`m2-placement-grouper.md`](m2-placement-grouper.md) |
 | M2 build batch planner | Implemented extraction | [`m2-build-batch-planner.md`](m2-build-batch-planner.md) |
 | WMO placement resolver | Implemented extraction | [`wmo-placement-resolver.md`](wmo-placement-resolver.md) |
+| WMO placement registry | Implemented extraction | [`wmo-placement-registry.md`](wmo-placement-registry.md) |
 | Third-person camera | Implemented | [`third-person-camera.md`](third-person-camera.md) |
 | Character presentation | Implemented boundary / Partial fidelity | [`character-presentation.md`](character-presentation.md) |
 | Renderer | Partial | [`world-renderer.md`](world-renderer.md), [`../../RENDER.md`](../../RENDER.md) |

docs/modules/wmo-placement-registry.md

@@ -0,0 +1,207 @@
+# WMO Placement Registry
+
+## Metadata
+
+| Field | Value |
+|---|---|
+| Status | Implemented extraction |
+| Target/work package | M03 / `M03-RND-WMO-PLACEMENT-REGISTRY-001` |
+| Owners | WMO placement-key to tile/global reference-set ownership |
+| Last verified | Worktree `work/sindo-main-codex/m03-wmo-placement-registry`, 2026-07-17 |
+| Profiles/capabilities | Existing ADT/WDT WMO placement paths; profile-independent |
+
+## Purpose
+
+Own the reference sets that keep one resolved WMO placement active across one
+or more ADT tiles, or across the global WDT placement lifetime. This separates
+value-only placement ownership from scene and render-resource ownership.
+
+## Non-goals
+
+- Resolve WMO paths, placement identity or world transforms.
+- Own Nodes, Resources, RIDs, roots, jobs, queues, tasks or caches.
+- Load, instantiate, build or free WMO content.
+- Change duplicate order, budgets, retries or global-WMO behavior.
+- Claim original-client WMO visual, portal, room or material parity.
+
+## Context and boundaries
+
+```mermaid
+flowchart LR
+    Parsed[ADT/WDT placement] --> Resolver[WmoPlacementResolver]
+    Resolver --> Key[Placement key]
+    Tile[Tile/global reference key] --> Loader[StreamingWorldLoader]
+    Key --> Loader
+    Loader --> Registry[WmoPlacementRegistry]
+    Registry --> Decision[Existing or final-release decision]
+    Decision --> Loader
+    Loader --> NodeMap[Loader key-to-Node map]
+    Loader --> Jobs[Loader jobs/queues/resources]
+```
+
+The registry depends only on `RefCounted`, `Dictionary`, `Array` and `String`.
+SceneTree, Node, Resource, RID, files, loaders, threads, locks, network,
+gameplay and editor UI are forbidden dependencies.
+
+## Public API
+
+| Symbol | Kind | Purpose | Thread/lifetime | Errors |
+|---|---|---|---|---|
+| `add_reference(placement_key, reference_key)` | Command/query | Idempotently add a reference; return true only when creating the placement key | Renderer main thread; map session | Empty key returns false and changes nothing |
+| `release_reference(placement_key, reference_key)` | Command/query | Remove an owned reference; return true only on final removal | Renderer main thread; map session | Empty, unknown or non-owner input returns false |
+| `contains(placement_key)` | Query | Test whether any reference keeps a placement active | Renderer main thread; map session | Empty key returns false |
+| `active_count()` | Query | Count active placement keys, not references | Renderer main thread; map session | None |
+| `diagnostic_snapshot()` | Query | Return detached, placement/reference-sorted records | Renderer main thread; caller-owned result | None |
+| `clear()` | Command | Remove all ownership records idempotently | Renderer main thread; reset/shutdown | None |
+
+## Inputs and outputs
+
+| Direction | Contract/data | Producer | Consumer | Ownership | Thread/lifetime |
+|---|---|---|---|---|---|
+| Input | Resolved `uid:*`, `tile:*:*` or `global` placement key | `WmoPlacementResolver` / loader global adapter | Registry | Copied String dictionary key | Until final release/clear |
+| Input | ADT tile key or `__global__` reference key | Loader | Registry | Copied String set key | Until release/clear |
+| Output | First-placement Boolean | Registry | Loader creation path | Value | One call |
+| Output | Final-release Boolean | Registry | Loader cancellation/free path | Value | One call |
+| Output | Active count and sorted diagnostic records | Registry | Renderer diagnostics/verifier | Detached values | Caller lifetime |
+
+## Data flow
+
+```mermaid
+flowchart TD
+    Add[add placement + reference] --> Valid{Both non-empty?}
+    Valid -->|no| Reject[false; unchanged]
+    Valid -->|yes| Existing{Placement exists?}
+    Existing -->|no| Create[Create reference set; true]
+    Existing -->|yes| Retain[Idempotently add reference; false]
+    Release[release placement + reference] --> Owner{Known owner reference?}
+    Owner -->|no| Reject
+    Owner -->|yes| Erase[Erase reference]
+    Erase --> Empty{Set empty?}
+    Empty -->|no| Retained[false; placement remains]
+    Empty -->|yes| Final[Erase placement; true]
+```
+
+## Lifecycle and state
+
+The states for one placement are `Absent`, `Referenced` and back to `Absent`.
+The first valid add enters `Referenced`; further tile/global adds remain there.
+Only release of the final owned reference returns to `Absent`. Map reset and
+shutdown call `clear`, which is safe from either state.
+
+```mermaid
+stateDiagram-v2
+    [*] --> Absent
+    Absent --> Referenced: first valid add / true
+    Referenced --> Referenced: idempotent/shared add / false
+    Referenced --> Referenced: non-owner/non-final release / false
+    Referenced --> Absent: final owned release / true
+    Referenced --> Absent: clear
+```
+
+## Main sequence
+
+```mermaid
+sequenceDiagram
+    participant Loader as StreamingWorldLoader
+    participant Registry as WmoPlacementRegistry
+    participant Nodes as Loader Node map
+    Loader->>Registry: contains(placement key)
+    alt existing placement
+        Loader->>Registry: add_reference(key, tile)
+    else new placement built successfully
+        Loader->>Nodes: store key-to-Node
+        Loader->>Registry: add_reference(key, tile/global)
+    end
+    Loader->>Registry: release_reference(key, tile)
+    alt final reference
+        Registry-->>Loader: true
+        Loader->>Loader: cancel render build
+        Loader->>Nodes: queue-free and erase Node
+    else shared/unknown reference
+        Registry-->>Loader: false
+    end
+```
+
+## Ownership, threading and resources
+
+- The registry owns only placement-key Dictionaries and reference-key sets.
+- The loader owns the parallel placement-key-to-Node map and every Node action.
+- The loader also owns WMO roots, tile state, caches, requests, jobs, queues,
+  retries, cancellation and render-resource lifetime.
+- Current calls are serialized on the renderer main thread. The registry has no
+  lock and must not be mutated concurrently.
+
+## Errors, cancellation and recovery
+
+| Failure | Detection | Behavior | Diagnostic | Recovery |
+|---|---|---|---|---|
+| Empty placement/reference key | API guard | Reject without mutation | Contract verifier | Repair caller input |
+| Duplicate add | Existing set member | Idempotent retain | Sorted snapshot | No recovery required |
+| Unknown/non-owner release | Missing placement/reference | Ignore without mutation | Contract verifier | Release from actual owner or reset |
+| Tile build cancellation | Loader-owned condition | Loader cancels job, then releases recorded refs | Existing queue metrics | Retry when tile becomes wanted |
+| Final release | Empty set after erase | Return true and erase registry record | Active count | Loader cancels/free Node exactly once |
+| Map reset/shutdown | Loader lifecycle | Loader frees Nodes/jobs and clears registry | Shutdown regression | Next map begins empty |
+
+## Configuration and capabilities
+
+There is no setting, profile branch or capacity knob. WMO tile radius, cache
+limits, render budgets and visibility settings remain loader-owned.
+
+## Persistence, cache and migration
+
+No data is serialized and no cache/schema/version changes. Placement and
+reference keys exist only for the current renderer map session.
+
+## Diagnostics and observability
+
+`active_count` backs existing WMO instance metrics. `diagnostic_snapshot`
+returns deterministic detached records for tests and future read-only
+diagnostics; mutating the returned arrays cannot alter registry state.
+
+## Verification
+
+- `verify_wmo_placement_registry.gd`: invalid/first/idempotent/shared/non-owner/
+  final/global/clear behavior, deterministic detached diagnostics, source
+  ownership boundaries and bounded 100-by-256 shared-reference cycles.
+- WMO resolver, material, runtime-cache shutdown and the renderer regression
+  suite verify the unchanged loader adapters and surrounding lifecycle.
+- Fidelity evidence is exact preservation of the repository's prior shared-ref
+  and final-release semantics. Asset-backed 3.3.5a comparison is still pending.
+
+## Extension points
+
+- WMO build/resource state can be extracted separately without moving Nodes
+  into this registry.
+- A future diagnostic adapter may expose the detached snapshot through the
+  facade without exposing mutable loader internals.
+
+## Capability status
+
+| Capability | Status | Evidence | Gap/next step |
+|---|---|---|---|
+| WMO placement reference ownership | Implemented extraction | Contract/source/timing verifier | Asset-backed cross-tile corpus pending |
+| WMO build/resource scheduling | Remains in loader | Existing runtime regressions | Separate state/cancellation package |
+| WMO visual/portal/material fidelity | Partial | Renderer baseline/material checks | Original-client paired evidence pending |
+
+## Known gaps and risks
+
+- Correctness assumes the loader records each successful placement reference in
+  the tile `wmo_refs` array before unregister.
+- Old caches without positive UID retain resolver-defined per-tile identity.
+- No proprietary WMO corpus or original-client paired capture is in this package.
+
+## Source map
+
+| Path | Responsibility |
+|---|---|
+| `src/render/wmo/wmo_placement_registry.gd` | Placement-key/reference-set ownership |
+| `src/render/wmo/wmo_placement_resolver.gd` | Stable path, identity and transform rules |
+| `src/scenes/streaming/streaming_world_loader.gd` | Node map, instances, resources, jobs, queues and lifecycle reactions |
+| `src/tools/verify_wmo_placement_registry.gd` | Contract, boundary and timing regression |
+
+## Related decisions and references
+
+- [`wmo-placement-resolver.md`](wmo-placement-resolver.md)
+- [`world-renderer.md`](world-renderer.md)
+- [`../../RENDER.md`](../../RENDER.md)
+- [`../../targets/roadmap/02-rendering-and-graphics.md`](../../targets/roadmap/02-rendering-and-graphics.md)

docs/modules/wmo-placement-resolver.md

@@ -19,7 +19,8 @@ live-prototype instance paths.
 ## Non-goals
 
 - Parse ADT/WDT or convert canonical WoW coordinates.
-- Own WMO registry references, tile state, jobs, queues or retries.
+- Own WMO registry references, tile state, jobs, queues or retries; reference
+  ownership belongs to `WmoPlacementRegistry`.
 - Load/validate cached scenes or lightweight render resources.
 - Create Nodes, Mesh/MultiMesh, materials or RIDs.
 - Implement portals, rooms, visibility, materials, doodads or WMO parity.
@@ -34,7 +35,7 @@ flowchart LR
     Resolver --> Identity[Registry unique key]
     Resolver --> Transform[World Transform3D]
     CacheKey --> Cache[Loader WMO caches/requests]
-    Identity --> Registry[Loader WMO registry]
+    Identity --> Registry[WmoPlacementRegistry]
     Transform --> RenderRoot[Lightweight render root]
     Transform --> Scene[Cached scene instance]
     Transform --> Live[Live prototype instance]
@@ -60,7 +61,7 @@ WorkerThreadPool, mutexes, files, gameplay, network and editor UI are forbidden.
 | Input | Raw placement Dictionary | WDT global or ADT MODF parser result | Identity/transform queries | Read-only shallow value | One call |
 | Input | Tile key and placement index | Loader build job | Synthetic identity fallback | Copied scalar/String | Registry entry lifetime |
 | Output | Normalized relative path | Resolver | Render/scene cache and load-request maps | New String value | Request/cache lookup |
-| Output | `uid:*` or `tile:*:*` key | Resolver | Loader WMO registry/ref arrays | New String value | Until unregister/reset |
+| Output | `uid:*` or `tile:*:*` key | Resolver | `WmoPlacementRegistry` and loader ref arrays | New String value | Until unregister/reset |
 | Output | World `Transform3D` | Resolver | Three WMO instance adapters | Value copy | Instance lifetime after assignment |
 
 The resolver retains no source Dictionary, output or engine resource.
@@ -91,7 +92,7 @@ and shutdown require no resolver operation.
 sequenceDiagram
     participant Loader as StreamingWorldLoader
     participant Resolver as WmoPlacementResolver
-    participant Registry as Loader WMO registry/cache
+    participant Registry as WmoPlacementRegistry
     participant Instance as Render/cached/live instance
     Loader->>Resolver: normalize_relative_path(path)
     Resolver-->>Loader: cache key
@@ -105,8 +106,9 @@ sequenceDiagram
 ## Ownership, threading and resources
 
 - The resolver owns only call-local scalar/value calculations.
-- The loader owns WMO registry entries/ref sets, cache/load-request state, build
-  jobs/queues, resource fallback and cancellation.
+- `WmoPlacementRegistry` owns placement-key reference sets. The loader owns its
+  key-to-Node map, cache/load-request state, jobs/queues, resource fallback and
+  cancellation.
 - The loader and builders own every Node/Mesh/MultiMesh/material/RID lifecycle.
 - Pure calls are thread-safe; current consumers execute on the main thread.
 
@@ -152,8 +154,8 @@ in the facade/loader diagnostic snapshot.
 
 ## Extension points
 
-- A later package may extract WMO registry ownership/ref release using these
-  stable keys.
+- `WmoPlacementRegistry` consumes these stable keys; later packages may extract
+  WMO build/resource state without changing the resolver.
 - Render-group build cursor and resource-selection state require separate
   lifecycle/cancellation contracts.
 
@@ -162,7 +164,8 @@ in the facade/loader diagnostic snapshot.
 | Capability | Status | Evidence | Gap/next step |
 |---|---|---|---|
 | Consistent WMO placement identity/transform | Implemented extraction | Contract/source/timing verifier | Asset-backed placement comparison pending |
-| WMO registry/build services | Remains in loader | Existing runtime regressions | Stateful extraction pending |
+| WMO placement registry | Implemented extraction | Ownership/source/timing verifier | Asset-backed cross-tile corpus pending |
+| WMO build services | Remains in loader | Existing runtime regressions | Stateful extraction pending |
 | Portals/rooms/material fidelity | Partial | M00 checkpoint/material evidence | Broader WMO implementation pending |
 
 ## Known gaps and risks
@@ -177,11 +180,13 @@ in the facade/loader diagnostic snapshot.
 | Path | Responsibility |
 |---|---|
 | `src/render/wmo/wmo_placement_resolver.gd` | Path, identity and transform rules |
-| `src/scenes/streaming/streaming_world_loader.gd` | Registry/cache/build/resource/Node ownership |
+| `src/render/wmo/wmo_placement_registry.gd` | Placement reference-set ownership |
+| `src/scenes/streaming/streaming_world_loader.gd` | Node map/cache/build/resource ownership |
 | `src/tools/verify_wmo_placement_resolver.gd` | Contract, source and timing regression |
 
 ## Related decisions and references
 
 - [`world-renderer.md`](world-renderer.md)
+- [`wmo-placement-registry.md`](wmo-placement-registry.md)
 - [`../../RENDER.md`](../../RENDER.md)
 - [`../../targets/roadmap/02-rendering-and-graphics.md`](../../targets/roadmap/02-rendering-and-graphics.md)

docs/modules/world-renderer.md

@@ -7,7 +7,7 @@
 | 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 packages; M03 M2 packages; M03 WMO placement package |
 | Owners | Renderer workstream / milestone integrator |
-| Last verified | Worktree `work/sindo-main-codex/m03-wmo-placement-resolver`, 2026-07-17 |
+| Last verified | Worktree `work/sindo-main-codex/m03-wmo-placement-registry`, 2026-07-17 |
 | Profiles/capabilities | `Performance`, `Balanced`, `High`, `Custom`; Blizzlike fidelity incomplete |
 
 ## Purpose
@@ -56,6 +56,8 @@ flowchart LR
     M2Batch --> Loader
     Loader --> WmoPlacement[WmoPlacementResolver]
     WmoPlacement --> Loader
+    Loader --> WmoRegistry[WmoPlacementRegistry]
+    WmoRegistry --> Loader
     Native --> Parsed[Parsed tile/model data]
     Parsed --> Loader
     Loader --> Scene[SceneTree nodes]
@@ -127,6 +129,7 @@ from externally reading/writing loader-private queue, task, cache and tile-state
 | `M2PlacementGrouper.group_placements` | Internal pure M2 service | Validates and groups ordered tile-local placement transforms by normalized path | Worker/main thread; stateless | Invalid variants/name IDs/empty paths are skipped |
 | `M2BuildBatchPlanner.plan_batch` | Internal pure M2 service | Selects static/animated batch count and next group cursor | Main/any thread; stateless | Non-positive selected limit clamps to one; empty range completes |
 | `WmoPlacementResolver.normalize_relative_path/resolve_unique_key/resolve_world_transform` | Internal pure WMO service | Resolves cache key, registry identity and world transform | Main/any thread; stateless | Missing UID uses tile/index fallback; transform fields use historical defaults |
+| `WmoPlacementRegistry.add_reference/release_reference/contains/active_count/diagnostic_snapshot/clear` | Internal WMO service | Owns placement-key to tile/global reference sets | Renderer main thread; map session | Empty/unknown/non-owner input is rejected without mutation |
 
 Публичным contract не считаются `StreamingWorldLoader` methods/properties,
 внутренние dictionaries, queues, job records и generated node names. Scene-owned
@@ -156,6 +159,7 @@ loader configuration remains transitional composition data, not a caller API.
 | Internal grouping | Tile origin, M2 names and placements | Loader / `M2PlacementGrouper` | Loader worker result/build job | Fresh Dictionary/Transform3D arrays | One grouping task |
 | Internal batch plan | Transform count/offset, path kind and limits | Loader / `M2BuildBatchPlanner` | Loader materialization/cursor adapter | Fresh scalar Dictionary | One build operation |
 | Internal WMO placement | Path, MODF placement, tile/index | Loader / `WmoPlacementResolver` | WMO caches, registry and three instance adapters | Value-only String/Transform3D | Lookup/placement lifetime |
+| Internal WMO ownership | Resolved placement key and tile/global reference key | Loader / `WmoPlacementRegistry` | Loader create/retain/final-free decisions | Registry-owned String sets; detached diagnostics | Map session or final release |
 | 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 |
@@ -205,7 +209,8 @@ flowchart TD
     M2Grouper --> M2Batch[M2BuildBatchPlanner]
     M2Batch --> M2
     R --> WmoPlacement[WmoPlacementResolver]
-    WmoPlacement --> WMO
+    WmoPlacement --> WmoRegistry[WmoPlacementRegistry]
+    WmoRegistry --> WMO
     R --> B[RenderBudgetScheduler permits]
     B --> Terrain[Terrain attach/upgrade]
     B --> M2[M2 group/MultiMesh attach]
@@ -328,7 +333,9 @@ sequenceDiagram
 - `M2BuildBatchPlanner` is stateless and owns only call-local scalar plans. The
   loader retains queue/resource transitions, cursor adoption and materialization.
 - `WmoPlacementResolver` is stateless and owns only call-local cache-key,
-  identity and transform values. The loader retains WMO refs/caches/jobs/resources.
+  identity and transform values. `WmoPlacementRegistry` owns only placement-key
+  reference sets. The loader retains the key-to-Node map, caches, jobs, queues,
+  resources, cancellation and every Node lifecycle action.
 - 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
@@ -422,6 +429,8 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
   count, completion/cursor rules, source boundary and bounded timing.
 - WMO placement contract: cache-path normalization, positive/fallback identity,
   default/rotated/unclamped transforms, three consumers and bounded timing.
+- WMO placement registry contract: first/idempotent/shared/non-owner/final/global
+  lifecycle, detached sorted diagnostics, source ownership and bounded timing.
 - 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.
@@ -455,7 +464,8 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | M2 placement transform resolver | Implemented extraction | Scene-free formula/source/timing contract across three consumers | Asset-backed visual recheck and general placement parity pending |
 | M2 placement grouper | Implemented extraction | Scene-free validation/order/transform/source/timing contract | Worker/build state, spatial cells and asset-backed p95/p99 remain pending |
 | M2 build batch planner | Implemented extraction | Scene-free limit/count/cursor/source/timing contract | Queue/resource state, spatial cells and asset-backed p95/p99 remain pending |
-| WMO placement resolver | Implemented extraction | Scene-free path/identity/transform/source/timing contract | Registry/build extraction and asset-backed comparison pending |
+| WMO placement resolver | Implemented extraction | Scene-free path/identity/transform/source/timing contract | Asset-backed comparison pending |
+| WMO placement registry | Implemented extraction | Scene-free ownership/lifecycle/source/timing contract | Build/resource state and asset-backed cross-tile corpus 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 |

src/render/wmo/wmo_placement_registry.gd

@@ -0,0 +1,69 @@
+class_name WmoPlacementRegistry
+extends RefCounted
+
+## Owns WMO placement-key to tile/global reference-key sets without Nodes.
+
+var _reference_keys_by_placement_key: Dictionary = {}
+
+
+## Adds one idempotent reference and returns true only for a newly registered
+## placement key. Empty placement/reference keys are rejected.
+func add_reference(placement_key: String, reference_key: String) -> bool:
+	if placement_key.is_empty() or reference_key.is_empty():
+		return false
+	var is_new_placement := not _reference_keys_by_placement_key.has(placement_key)
+	if is_new_placement:
+		_reference_keys_by_placement_key[placement_key] = {}
+	var reference_keys: Dictionary = _reference_keys_by_placement_key[placement_key]
+	reference_keys[reference_key] = true
+	return is_new_placement
+
+
+## Releases one reference and returns true only when the final reference removes
+## the placement key. Unknown and non-owner references leave state unchanged.
+func release_reference(placement_key: String, reference_key: String) -> bool:
+	if placement_key.is_empty() or reference_key.is_empty():
+		return false
+	if not _reference_keys_by_placement_key.has(placement_key):
+		return false
+	var reference_keys: Dictionary = _reference_keys_by_placement_key[placement_key]
+	if not reference_keys.has(reference_key):
+		return false
+	reference_keys.erase(reference_key)
+	if not reference_keys.is_empty():
+		return false
+	_reference_keys_by_placement_key.erase(placement_key)
+	return true
+
+
+## Returns whether the placement key currently has at least one reference.
+func contains(placement_key: String) -> bool:
+	return not placement_key.is_empty() and _reference_keys_by_placement_key.has(placement_key)
+
+
+## Removes every placement/reference record. Safe to call repeatedly.
+func clear() -> void:
+	_reference_keys_by_placement_key.clear()
+
+
+## Returns the number of currently referenced placement keys.
+func active_count() -> int:
+	return _reference_keys_by_placement_key.size()
+
+
+## Returns detached, placement/reference-key-sorted diagnostic records.
+func diagnostic_snapshot() -> Array[Dictionary]:
+	var placement_keys: Array = _reference_keys_by_placement_key.keys()
+	placement_keys.sort()
+	var snapshot: Array[Dictionary] = []
+	for placement_key_variant in placement_keys:
+		var placement_key := String(placement_key_variant)
+		var reference_keys: Array = (
+			_reference_keys_by_placement_key[placement_key] as Dictionary
+		).keys()
+		reference_keys.sort()
+		snapshot.append({
+			"placement_key": placement_key,
+			"reference_keys": reference_keys.duplicate(),
+		})
+	return snapshot

src/render/wmo/wmo_placement_registry.gd.uid

@@ -0,0 +1 @@
+uid://cfbo5fw33vw4f

src/scenes/streaming/streaming_world_loader.gd

@@ -12,6 +12,9 @@ const WMO_BUILDER_SCRIPT := preload("res://addons/mpq_extractor/loaders/wmo_buil
 const WMO_PLACEMENT_RESOLVER_SCRIPT := preload(
 	"res://src/render/wmo/wmo_placement_resolver.gd"
 )
+const WMO_PLACEMENT_REGISTRY_SCRIPT := preload(
+	"res://src/render/wmo/wmo_placement_registry.gd"
+)
 const M2_BUILDER_SCRIPT := preload("res://addons/mpq_extractor/loaders/m2_builder.gd")
 const M2_NATIVE_ANIMATED_BUILDER_SCRIPT := preload("res://addons/mpq_extractor/loaders/m2_native_animated_builder.gd")
 const M2_NATIVE_ANIMATOR_SCRIPT := preload("res://src/scenes/streaming/m2_native_animator.gd")
@@ -286,7 +289,8 @@ var _m2_animated_scene_cache: Dictionary = {}
 var _m2_static_animation_cache: Dictionary = {}
 var _m2_missing_cache: Dictionary = {}
 var _world_wmo_root: Node3D
-var _wmo_registry: Dictionary = {}
+var _wmo_placement_registry := WMO_PLACEMENT_REGISTRY_SCRIPT.new()
+var _wmo_instance_nodes_by_unique_key: Dictionary = {}
 
 
 func _ready() -> void:
@@ -1031,7 +1035,7 @@ func render_baseline_snapshot() -> Dictionary:
 		},
 		"cache_entries": _tile_mesh_cache.size(),
 		"m2_active_unique_ids": _m2_unique_placement_registry.active_count(),
-		"wmo_instances": _wmo_registry.size(),
+		"wmo_instances": _wmo_placement_registry.active_count(),
 	}
 
 
@@ -1313,7 +1317,7 @@ func _tick_runtime_stats(delta: float) -> void:
 		m2_tiles,
 		m2_multimeshes,
 		m2_instances,
-		_wmo_registry.size(),
+		_wmo_placement_registry.active_count(),
 	])
 
 
@@ -3363,7 +3367,7 @@ func _wdt_has_global_wmo() -> bool:
 func _place_global_wmo() -> void:
 	if not _wdt_has_global_wmo():
 		return
-	if _wmo_registry.has("global"):
+	if _wmo_placement_registry.contains("global"):
 		return
 
 	_ensure_world_wmo_root()
@@ -3387,10 +3391,7 @@ func _place_global_wmo() -> void:
 
 	_world_wmo_root.add_child(instance)
 	_set_editor_owner_recursive(instance)
-	_wmo_registry["global"] = {
-		"node": instance,
-		"refs": {"__global__": true},
-	}
+	_register_wmo_instance_reference("global", "__global__", instance)
 
 
 func _sync_detail_assets(state: Dictionary, focus_pos: Vector3) -> Dictionary:
@@ -3566,10 +3567,8 @@ func _process_wmo_build_jobs() -> void:
 					tile_key,
 					index
 				)
-				if _wmo_registry.has(unique_key):
-					var entry: Dictionary = _wmo_registry[unique_key]
-					var entry_refs: Dictionary = entry["refs"]
-					entry_refs[tile_key] = true
+				if _wmo_placement_registry.contains(unique_key):
+					_wmo_placement_registry.add_reference(unique_key, tile_key)
 					refs.append(unique_key)
 				else:
 					var rel_path: String = str(wmo_names[name_id]).replace("\\", "/")
@@ -3579,10 +3578,7 @@ func _process_wmo_build_jobs() -> void:
 						if instance != null:
 							_world_wmo_root.add_child(instance)
 							_set_editor_owner_recursive(instance)
-							_wmo_registry[unique_key] = {
-								"node": instance,
-								"refs": {tile_key: true},
-							}
+							_register_wmo_instance_reference(unique_key, tile_key, instance)
 							refs.append(unique_key)
 							_start_wmo_render_build(unique_key, instance, render_resource)
 					else:
@@ -3602,10 +3598,11 @@ func _process_wmo_build_jobs() -> void:
 										_prepare_runtime_wmo_instance(live_instance)
 										_world_wmo_root.add_child(live_instance)
 										_set_editor_owner_recursive(live_instance)
-										_wmo_registry[unique_key] = {
-											"node": live_instance,
-											"refs": {tile_key: true},
-										}
+										_register_wmo_instance_reference(
+											unique_key,
+											tile_key,
+											live_instance
+										)
 										refs.append(unique_key)
 							else:
 								var scene_instance := _instantiate_wmo_scene(rel_path, scene, placement)
@@ -3613,10 +3610,11 @@ func _process_wmo_build_jobs() -> void:
 									_prepare_runtime_wmo_instance(scene_instance)
 									_world_wmo_root.add_child(scene_instance)
 									_set_editor_owner_recursive(scene_instance)
-									_wmo_registry[unique_key] = {
-										"node": scene_instance,
-										"refs": {tile_key: true},
-									}
+									_register_wmo_instance_reference(
+										unique_key,
+										tile_key,
+										scene_instance
+									)
 									refs.append(unique_key)
 				if advance_job:
 					job["refs"] = refs
@@ -3994,6 +3992,17 @@ func _cancel_wmo_build_job(tile_key: String) -> void:
 	_wmo_build_queue.erase(tile_key)
 
 
+func _register_wmo_instance_reference(
+		placement_key: String,
+		reference_key: String,
+		instance: Node3D
+) -> void:
+	if placement_key.is_empty() or reference_key.is_empty() or instance == null:
+		return
+	_wmo_instance_nodes_by_unique_key[placement_key] = instance
+	_wmo_placement_registry.add_reference(placement_key, reference_key)
+
+
 func _unregister_tile_wmos(state: Dictionary) -> void:
 	var refs: Array = state.get("wmo_refs", [])
 	var tile_key: String = String(state.get("key", ""))
@@ -4003,18 +4012,16 @@ func _unregister_tile_wmos(state: Dictionary) -> void:
 		state["wmo_building"] = false
 		return
 
-	for unique_key in refs:
-		if not _wmo_registry.has(unique_key):
+	for unique_key_variant in refs:
+		var unique_key := String(unique_key_variant)
+		if not _wmo_placement_registry.contains(unique_key):
 			continue
-		var entry: Dictionary = _wmo_registry[unique_key]
-		var entry_refs: Dictionary = entry["refs"]
-		entry_refs.erase(tile_key)
-		if entry_refs.is_empty():
+		if _wmo_placement_registry.release_reference(unique_key, tile_key):
 			_cancel_wmo_render_build_job(String(unique_key))
-			var node: Node = entry.get("node", null)
-			if node:
+			var node: Node = _wmo_instance_nodes_by_unique_key.get(unique_key, null)
+			if node != null and is_instance_valid(node):
 				node.queue_free()
-			_wmo_registry.erase(unique_key)
+			_wmo_instance_nodes_by_unique_key.erase(unique_key)
 
 	state["wmo_refs"] = []
 	state["wmo_building"] = false
@@ -4023,14 +4030,14 @@ func _unregister_tile_wmos(state: Dictionary) -> void:
 func _clear_wmo_registry() -> void:
 	_wmo_render_build_jobs.clear()
 	_wmo_render_build_queue.clear()
-	for entry_variant in _wmo_registry.values():
-		if not (entry_variant is Dictionary):
+	for node_variant in _wmo_instance_nodes_by_unique_key.values():
+		if not (node_variant is Node):
 			continue
-		var entry: Dictionary = entry_variant
-		var node: Node = entry.get("node", null)
-		if node and is_instance_valid(node):
+		var node := node_variant as Node
+		if is_instance_valid(node):
 			_queue_free_streamed_node(node)
-	_wmo_registry.clear()
+	_wmo_instance_nodes_by_unique_key.clear()
+	_wmo_placement_registry.clear()
 	if _world_wmo_root and is_instance_valid(_world_wmo_root):
 		_queue_free_streamed_node(_world_wmo_root)
 	_world_wmo_root = null

src/tools/verify_wmo_placement_registry.gd

@@ -0,0 +1,203 @@
+extends SceneTree
+
+## Asset-free ownership, lifecycle, dependency and timing regression for WMOs.
+
+const REGISTRY_SCRIPT := preload("res://src/render/wmo/wmo_placement_registry.gd")
+const REGISTRY_PATH := "res://src/render/wmo/wmo_placement_registry.gd"
+const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
+
+
+func _initialize() -> void:
+	var failures: Array[String] = []
+	_verify_invalid_and_first_reference(failures)
+	_verify_idempotent_and_shared_references(failures)
+	_verify_owner_checked_final_release(failures)
+	_verify_global_reference_and_clear(failures)
+	_verify_detached_sorted_diagnostics(failures)
+	_verify_ownership_boundaries(failures)
+	var elapsed_milliseconds := _verify_bounded_timing(failures)
+	if not failures.is_empty():
+		for failure in failures:
+			push_error("WMO_PLACEMENT_REGISTRY: %s" % failure)
+		quit(1)
+		return
+	print(
+		"WMO_PLACEMENT_REGISTRY PASS cases=10 iterations=100 elapsed_ms=%.3f"
+		% elapsed_milliseconds
+	)
+	quit(0)
+
+
+func _verify_invalid_and_first_reference(failures: Array[String]) -> void:
+	var registry: RefCounted = REGISTRY_SCRIPT.new()
+	_expect_false(registry.call("add_reference", "", "tile-a"), "empty placement rejected", failures)
+	_expect_false(registry.call("add_reference", "uid:7", ""), "empty reference rejected", failures)
+	_expect_true(registry.call("add_reference", "uid:7", "tile-a"), "first reference registers", failures)
+	_expect_true(registry.call("contains", "uid:7"), "registered placement contained", failures)
+	_expect_equal(int(registry.call("active_count")), 1, "first active count", failures)
+
+
+func _verify_idempotent_and_shared_references(failures: Array[String]) -> void:
+	var registry: RefCounted = REGISTRY_SCRIPT.new()
+	registry.call("add_reference", "uid:11", "tile-a")
+	_expect_false(
+		registry.call("add_reference", "uid:11", "tile-a"),
+		"same reference idempotent",
+		failures
+	)
+	_expect_false(
+		registry.call("add_reference", "uid:11", "tile-b"),
+		"shared reference retains placement",
+		failures
+	)
+	_expect_equal(int(registry.call("active_count")), 1, "shared active count", failures)
+	_expect_false(
+		registry.call("release_reference", "uid:11", "tile-a"),
+		"non-final release retains placement",
+		failures
+	)
+	_expect_true(registry.call("contains", "uid:11"), "shared placement remains", failures)
+
+
+func _verify_owner_checked_final_release(failures: Array[String]) -> void:
+	var registry: RefCounted = REGISTRY_SCRIPT.new()
+	registry.call("add_reference", "uid:19", "tile-owner")
+	_expect_false(
+		registry.call("release_reference", "uid:19", "tile-other"),
+		"non-owner release ignored",
+		failures
+	)
+	_expect_false(
+		registry.call("release_reference", "uid:404", "tile-owner"),
+		"unknown placement release ignored",
+		failures
+	)
+	_expect_true(
+		registry.call("release_reference", "uid:19", "tile-owner"),
+		"final owner release removes placement",
+		failures
+	)
+	_expect_false(registry.call("contains", "uid:19"), "released placement absent", failures)
+
+
+func _verify_global_reference_and_clear(failures: Array[String]) -> void:
+	var registry: RefCounted = REGISTRY_SCRIPT.new()
+	_expect_true(
+		registry.call("add_reference", "global", "__global__"),
+		"global reference registers",
+		failures
+	)
+	_expect_true(
+		registry.call("release_reference", "global", "__global__"),
+		"global final release removes",
+		failures
+	)
+	registry.call("add_reference", "uid:3", "tile-a")
+	registry.call("clear")
+	registry.call("clear")
+	_expect_equal(int(registry.call("active_count")), 0, "clear idempotent", failures)
+
+
+func _verify_detached_sorted_diagnostics(failures: Array[String]) -> void:
+	var registry: RefCounted = REGISTRY_SCRIPT.new()
+	registry.call("add_reference", "uid:20", "tile-b")
+	registry.call("add_reference", "uid:10", "tile-c")
+	registry.call("add_reference", "uid:10", "tile-a")
+	var snapshot: Array = registry.call("diagnostic_snapshot")
+	_expect_equal(snapshot.size(), 2, "diagnostic record count", failures)
+	_expect_string_equal(String(snapshot[0]["placement_key"]), "uid:10", "placement sort", failures)
+	_expect_string_array(snapshot[0]["reference_keys"], ["tile-a", "tile-c"], "reference sort", failures)
+	(snapshot[0]["reference_keys"] as Array).append("mutated")
+	var fresh_snapshot: Array = registry.call("diagnostic_snapshot")
+	_expect_string_array(
+		fresh_snapshot[0]["reference_keys"],
+		["tile-a", "tile-c"],
+		"diagnostics detached",
+		failures
+	)
+
+
+func _verify_ownership_boundaries(failures: Array[String]) -> void:
+	var loader_source := _read_text(LOADER_PATH, failures)
+	var registry_source := _read_text(REGISTRY_PATH, failures)
+	_expect_true(
+		loader_source.contains("WMO_PLACEMENT_REGISTRY_SCRIPT.new()"),
+		"loader composes registry",
+		failures
+	)
+	_expect_true(loader_source.contains("_wmo_placement_registry.add_reference("), "loader delegates add", failures)
+	_expect_true(loader_source.contains("_wmo_placement_registry.release_reference("), "loader delegates release", failures)
+	_expect_true(loader_source.contains("_wmo_placement_registry.clear()"), "loader delegates clear", failures)
+	_expect_true(
+		loader_source.contains("_wmo_instance_nodes_by_unique_key"),
+		"loader retains node map",
+		failures
+	)
+	_expect_false(loader_source.contains("var _wmo_registry"), "legacy mixed registry removed", failures)
+	for forbidden_token in ["extends Node", "Node3D", "Resource", "RID", "Thread", "Mutex", "Semaphore"]:
+		_expect_false(
+			registry_source.contains(forbidden_token),
+			"registry omits %s ownership" % forbidden_token,
+			failures
+		)
+
+
+func _verify_bounded_timing(failures: Array[String]) -> float:
+	var registry: RefCounted = REGISTRY_SCRIPT.new()
+	var started_microseconds := Time.get_ticks_usec()
+	for iteration in range(100):
+		for placement_index in range(256):
+			var placement_key := "uid:%d" % placement_index
+			registry.call("add_reference", placement_key, "tile-a")
+			registry.call("add_reference", placement_key, "tile-b")
+		for placement_index in range(256):
+			var placement_key := "uid:%d" % placement_index
+			registry.call("release_reference", placement_key, "tile-a")
+			registry.call("release_reference", placement_key, "tile-b")
+		_expect_equal(int(registry.call("active_count")), 0, "timing cycle %d clears" % iteration, failures)
+	var elapsed_milliseconds := float(Time.get_ticks_usec() - started_microseconds) / 1000.0
+	_expect_true(elapsed_milliseconds < 1000.0, "100 shared-reference cycles remain bounded", failures)
+	return elapsed_milliseconds
+
+
+func _read_text(path: String, failures: Array[String]) -> String:
+	var file := FileAccess.open(path, FileAccess.READ)
+	if file == null:
+		failures.append("cannot open %s" % path)
+		return ""
+	return file.get_as_text()
+
+
+func _expect_equal(actual_value: int, expected_value: int, label: String, failures: Array[String]) -> void:
+	if actual_value != expected_value:
+		failures.append("%s expected %d, got %d" % [label, expected_value, actual_value])
+
+
+func _expect_string_equal(
+		actual_value: String,
+		expected_value: String,
+		label: String,
+		failures: Array[String]
+) -> void:
+	if actual_value != expected_value:
+		failures.append("%s expected %s, got %s" % [label, expected_value, actual_value])
+
+
+func _expect_string_array(
+		actual_values: Array,
+		expected_values: Array,
+		label: String,
+		failures: Array[String]
+) -> void:
+	if actual_values != expected_values:
+		failures.append("%s expected %s, got %s" % [label, expected_values, actual_values])
+
+
+func _expect_true(actual_value: bool, label: String, failures: Array[String]) -> void:
+	if not actual_value:
+		failures.append("%s expected true" % label)
+
+
+func _expect_false(actual_value: bool, label: String, failures: Array[String]) -> void:
+	if actual_value:
+		failures.append("%s expected false" % label)

src/tools/verify_wmo_placement_registry.gd.uid

@@ -0,0 +1 @@
+uid://dprfwayji363v