refactor(M03): extract ADT water scene finalizer

RENDER.md

@@ -34,6 +34,7 @@ Paired run 2026-07-11 подтвердил крупный coordinate/placement g
 - `src/render/wmo/wmo_render_resource_cache_state.gd` - validated lightweight WMO render Resources, negative cache and pending cache paths without ResourceLoader I/O.
 - `src/render/wmo/wmo_scene_resource_cache_state.gd` - validated cached-WMO PackedScenes, negative cache and pending `.tscn` paths without file/I/O/Node ownership.
 - `src/render/liquid/adt_water_load_pipeline_state.gd` - ADT water pending FIFO/dedupe, active task IDs and worker-safe parsed-result mailbox without parser or Node ownership.
+- `src/render/liquid/adt_water_scene_finalizer.gd` - stateless main-thread ADT water build/attach and optional persisted Editor ownership through the existing ADTBuilder.
 - `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.
@@ -1084,7 +1085,8 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
   active WorkerThreadPool task IDs and the mutex-protected parsed-result mailbox.
 - `StreamingWorldLoader` still selects concurrency, starts/waits tasks, invokes
   `ADTLoader`, consumes `WATER_FINALIZE` permits, rejects stale tile/path/root
-  results and builds/attaches water Nodes through `ADTBuilder` on the main thread.
+  results and owns `water_loaded` timing. Main-thread Water subtree construction
+  and attachment are delegated separately as described below.
 - Tile release still cancels only pending water requests; active work completes
   and its result is discarded when tile ownership is stale. Shutdown waits task
   IDs before clearing state; reset does not interrupt workers.
@@ -1093,6 +1095,23 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
 - Asset-backed MH2O/MCLQ fidelity, long-traversal leak/p95/p99 and paired capture
   evidence remain pending.
 
+## 2026-07-17 ADT Water Scene Finalizer Extraction
+
+- `AdtWaterSceneFinalizer` now owns the two main-thread operations that turn
+  validated parsed ADT data into a Water subtree: the existing
+  `ADTBuilder.build_tile_water_scene` call and attachment to the tile root.
+- Both raw tile finalization and delayed cached-tile water results use the same
+  service. Optional persisted Editor ownership is assigned recursively only
+  when the loader supplies its existing edited-scene owner.
+- The service is stateless and retains no Node, Mesh, material or RID. The tile
+  SceneTree subtree remains the lifetime owner; dry data still causes ADTBuilder
+  to free its temporary empty Water root.
+- Parsing, task/result state, concurrency, stale validation, `WATER_FINALIZE`
+  permits, `enable_water` and `water_loaded` timing remain loader-owned.
+- Geometry, materials, coordinates, cache formats, profiles and visible output
+  are unchanged. Synthetic geometry/ownership evidence is not an MH2O/MCLQ or
+  original-client parity claim; asset-backed traversal/p95/p99 remains pending.
+
 ## 2026-07-16 World Environment Snapshot Facade
 
 - `WorldEnvironmentSnapshot` carries one immutable finite time-of-day value,