rnd(M03): extract render budget scheduler

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-RND-FACADE-001` |
+| Target/work package | M00 baseline; `M01-RND-STREAMING-FOCUS-001`; `M01-QAR-SERVER-SPAWN-RENDERER-001`; `M03-RND-FACADE-001`; `M03-RND-STREAMING-PLANNER-001`; `M03-RND-SCHEDULER-001` |
 | Owners | Renderer workstream / milestone integrator |
-| Last verified | Worktree `work/sindo-main-codex/m03-renderer-facade`, 2026-07-15 |
+| Last verified | Worktree `work/sindo-main-codex/m03-render-budget-scheduler`, 2026-07-16 |
 | Profiles/capabilities | `Performance`, `Balanced`, `High`, `Custom`; Blizzlike fidelity incomplete |
 
 ## Purpose
@@ -37,6 +37,7 @@ flowchart LR
     Loader --> Planner[StreamingTargetPlanner]
     Planner --> TargetPlan[StreamingTargetPlan]
     TargetPlan --> Loader
+    Loader --> Budget[RenderBudgetScheduler]
     Assets[Extracted WDT/ADT/M2/WMO/BLP] --> Native[Native loaders]
     Cache[Baked terrain/M2/WMO caches] --> Loader
     Native --> Parsed[Parsed tile/model data]
@@ -98,6 +99,7 @@ loader configuration remains transitional composition data, not a caller API.
 | Input | Baked resources | Cache build tools | Streamer/builders | Shared immutable resource/cache entry | Session/cache lifetime |
 | Test input | Server-spawn render manifest | Coordinate fixture/verifier | Checkpoint capture tool | Repository-owned diagnostic data | Test-process lifetime |
 | Output | `StreamingTargetPlan` | `StreamingTargetPlanner` | Streamer queue/state apply | Immutable ephemeral value | One refresh |
+| Internal control | Per-frame lane limits and boolean permits | Streamer configuration / `RenderBudgetScheduler` | Ordered streamer drains | Scheduler-owned counters | Main thread/frame |
 | 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 |
@@ -131,7 +133,7 @@ flowchart TD
     T --> Q[Tile load queue]
     Q --> Parse[Worker parse/cache load]
     Parse --> R[Result queues]
-    R --> B[Per-frame budget scheduler]
+    R --> B[RenderBudgetScheduler permits]
     B --> Terrain[Terrain attach/upgrade]
     B --> M2[M2 group/MultiMesh attach]
     B --> WMO[WMO instance/group attach]
@@ -173,7 +175,7 @@ sequenceDiagram
     participant Stream as StreamingWorldLoader internal
     participant Planner as StreamingTargetPlanner
     participant Worker as Worker task
-    participant Budget as Main-thread budget
+    participant Budget as RenderBudgetScheduler
     participant Render as SceneTree/RenderingServer
     Source->>Focus: sample explicit Godot position
     Focus->>Facade: set/refresh typed focus
@@ -183,9 +185,12 @@ sequenceDiagram
     Stream->>Stream: queue priority and loaded-tile LOD/detail state
     Stream->>Worker: parse/load tile and detail data
     Worker-->>Stream: immutable result
-    Stream->>Budget: enqueue finalize operations
-    Budget->>Render: attach bounded terrain/M2/WMO/liquid work
+    Stream->>Budget: begin_frame(operation limits)
+    Stream->>Budget: try_consume_permit(lane)
+    Budget-->>Stream: true while lane remains bounded
+    Stream->>Render: attach permitted terrain/M2/WMO/liquid work
     Stream->>Render: evict outside retention range
+    Stream->>Budget: shutdown: cancel permit issuance
     Stream->>Worker: shutdown: wait for WorkerThreadPool tasks
     Stream->>Stream: shutdown: finish registered ResourceLoader requests
     Stream->>Render: clear queues and owned tree nodes/RIDs
@@ -199,6 +204,8 @@ sequenceDiagram
   streamer, focus source, returned metrics, queues, caches, nodes or RIDs.
 - `StreamingTargetPlanner` is stateless and owns only call-local calculations;
   its immutable plan is consumed synchronously by the streamer.
+- `RenderBudgetScheduler` owns only per-frame lane counters and a terminal
+  cancellation flag. The streamer retains queue ordering and all operation side effects.
 - Focus producers own the immutable `StreamingFocus` reference; the loader retains
   the latest reference and converts it to `Vector3` only inside the render boundary.
 - Worker tasks не должны менять SceneTree и shared Resource concurrently.
@@ -261,6 +268,9 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 - Unit/contract tests: streaming-focus contract/wiring, material mapping, unique-ID dedupe, placement probes, baseline manifest, five-point coordinate calibration, synthetic perceptual checkpoint diff, camera-pose grid plan.
 - Pure planner contract: center/corner/catalog/clamp/editor cases plus bounded
   High-like iteration timing without loading 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.
 - Integration/E2E: Eastern Kingdoms/Kalimdor streaming scenes, seven M00
   cold/warm checkpoints and one dedicated mapped server-spawn checkpoint.
 - Fidelity evidence: семь локальных build 12340 reference JPG покрывают terrain/ADT/M2/WMO/liquid/sky и реальный `GryphonRoost01`; automated cold/warm metrics имеют `compared=14`, `missing=0`. Sky использует приблизительно paired camera, а animated-M2 остаётся asset-paired/placement-unpaired из-за synthetic probe.
@@ -288,6 +298,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | Golden server-spawn visualization | Implemented | Pinned AzerothCore fixture, validated renderer manifest and diagnostic origin-marker capture at ADT `(32,48)`/MCNK `(3,12)` | No TrinityCore row or original-client visual-parity claim |
 | Stable renderer facade | Partial | `M03-RND-FACADE-001` contract/runtime/tool regressions | Focus and metrics migrated; environment/entity visuals/ground query remain |
 | Pure streaming target planner | Implemented | `M03-RND-STREAMING-PLANNER-001` asset-free contract/performance regression | Queue scheduling and loaded-tile LOD application remain in streamer |
+| Bounded render budget scheduler | Implemented | `M03-RND-SCHEDULER-001` asset-free permit/cancellation/performance regression | Queue storage, worker concurrency and operation execution remain in streamer/services |
 
 ## Known gaps and risks
 
@@ -317,11 +328,13 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/render/streaming/streaming_target_planner.gd` | Scene-free wanted/retained ADT target calculation |
 | `src/render/streaming/streaming_target_policy.gd` | Immutable renderer radius/prefetch policy |
 | `src/render/streaming/streaming_target_plan.gd` | Immutable planner result with read-only tile-key sets |
+| `src/render/streaming/render_budget_scheduler.gd` | Scene-free per-frame operation permits and terminal cancellation |
 | `src/scenes/streaming/streaming_world_loader.gd` | Current runtime orchestration, queues, caches and attachment |
 | `src/domain/streaming/streaming_focus.gd` | Immutable camera-independent streaming position contract |
 | `src/tools/verify_streaming_focus.gd` | Headless contract, dependency and runtime/tool wiring regression |
 | `src/tools/verify_world_render_facade.gd` | Facade delegation, snapshot isolation and consumer wiring regression |
 | `src/tools/verify_streaming_target_planner.gd` | Planner behavior, dependency and bounded timing regression |
+| `src/tools/verify_render_budget_scheduler.gd` | Scheduler bounds, shared-lane priority, cancellation and timing regression |
 | `addons/mpq_extractor/loaders/adt_builder.gd` | Terrain/material/liquid construction |
 | `addons/mpq_extractor/loaders/m2_builder.gd` | Static M2 mesh/material construction |
 | `addons/mpq_extractor/loaders/m2_native_animated_builder.gd` | Native animated M2 experiment |