fix(renderer): drain threaded loads on shutdown

docs/modules/world-renderer.md

@@ -141,6 +141,9 @@ sequenceDiagram
     Stream->>Budget: enqueue finalize operations
     Budget->>Render: attach bounded terrain/M2/WMO/liquid work
     Stream->>Render: evict outside retention range
+    Stream->>Worker: shutdown: wait for WorkerThreadPool tasks
+    Stream->>Stream: shutdown: finish registered ResourceLoader requests
+    Stream->>Render: clear queues, nodes, caches and RIDs
 ```
 
 ## Ownership, threading and resources
@@ -149,7 +152,7 @@ sequenceDiagram
 - Worker tasks не должны менять SceneTree и shared Resource concurrently.
 - Parsed/grouped results передаются обратно через guarded result queues.
 - Mesh/material/node/RID finalization выполняется main thread и ограничивается exported budgets.
-- Shutdown/map switch обязан отменить/дождаться jobs и освободить RIDs; M00 всё ещё фиксирует leaked-resource risk.
+- Shutdown/map switch обязан дождаться WorkerThreadPool jobs и зарегистрированных threaded ResourceLoader requests до очистки очередей, nodes, caches и RIDs.
 - Cache resources считаются immutable после публикации.
 
 ## Errors, cancellation and recovery
@@ -162,7 +165,7 @@ sequenceDiagram
 | Main-thread hitch | Named section timing | Frame spike, work remains queued | `HITCH` log | Lower budget/fix finalize path |
 | D3D12 descriptor exhaustion | Rendering backend error | Render failure/fallback backend | Godot error + baseline report | Dedup resources/fix settings |
 | Teleport/map change | Focus/session transition | Old jobs become stale | Target/session generation | Cancel/drop stale results |
-| Shutdown leak | Godot leak/RID diagnostics | Resource retained | Shutdown report | Ownership cleanup before DONE |
+| Shutdown leak | Godot leak/RID diagnostics | Resource retained | Verbose shutdown report | Drain owned worker and resource requests before clearing registries |
 
 ## Configuration and capabilities
 
@@ -226,7 +229,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 - Terrain-height probe исключил under-terrain состояние для всех пяти точек; waterfall exact-XZ miss классифицирован как TriangleMesh seam/edge и подтверждён nearby sample в 2 units.
 - Camera-occluder probe не нашёл camera containment в пяти точках; paired mismatch локализован прежде всего в manual look direction/target/FOV calibration, с явным ограничением по RID-only geometry.
 - Empirical FOV sweep выявил, что checkpoint camera должна явно вызывать `make_current()`; после исправления projection ranking остаётся inconclusive из-за неизвестного manual yaw/pitch/framing reference.
-- D3D12 descriptor and shutdown RID/resource issues remain.
+- D3D12 descriptor issues remain; the capture-path anonymous `RefCounted` shutdown leak is regression-covered by a clean verbose dry-run, while other RID/resource diagnostics still require independent evidence.
 - M2/WMO/material/particle/ribbon/portal parity incomplete.
 - Public API is mostly exported configuration rather than stable contracts.