# M03-RND-M2-ANIMATION-LOAD-PIPELINE-001 — M2 animation load pipeline state

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## Ownership

- Target: M03
- Program: RND
- Owner/Agent ID: sindo-main-codex
- Branch: `work/sindo-main-codex/m03-m2-animation-load-pipeline`
- Lease expires UTC: 2026-07-20
- Integrator: M03 milestone integrator

## Outcome

Extract threaded animated-M2 pending request records and completion-order
finalize FIFO from `StreamingWorldLoader` into an explicit state service.

## Non-goals

- Call ResourceLoader, select/validate GLB paths or interpret status values.
- Instantiate/repair/cache animated Nodes or own prototype outcomes.
- Change animation allow/deny/candidate policy, permits or visible behavior.
- Add cancellation, persistence, retries, dependencies or cache-format changes.

## Paths

- Exclusive: `src/render/m2/m2_animation_load_pipeline_state.gd`,
  `src/tools/verify_m2_animation_load_pipeline_state.gd`,
  `docs/modules/m2-animation-load-pipeline-state.md`, this claim
- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`, M2
  prototype/shutdown/material/build/facade/internal-access/manifest verifiers
  and module specs, `docs/modules/world-renderer.md`, `docs/modules/README.md`,
  `RENDER.md`, `targets/03-renderer-facade.md`
- Generated/ignored: `.godot`, native DLL, generated M2 resources, caches and
  proprietary renderer corpus

## Contracts and data

- One non-empty normalized path has at most one pending cache path.
- Pending snapshots preserve Dictionary insertion order and detach records.
- Completing a known request moves one copied record with opaque status into a
  completion-order FIFO; unknown/duplicate completion is rejected.
- Defensive discard removes pending state without creating a finalize record.
- Total work remains pending plus finalize count at all three historical metrics.
- Map reset and shutdown retain the same two clear sites; shutdown still drains
  ResourceLoader paths before clear.

## Dependencies

- Requires: accepted prototype cache package on master `20a64b5`
- Blocks: animated M2 finalization/materialization service extraction
- External state: ResourceLoader request statuses remain loader-owned

## Verification

- Commands: dedicated validation/dedupe/order/transition/discard/snapshot/clear/
  source/timing verifier; prototype/shutdown/material/M2 build/facade/internal-
  access/manifest and adjacent M2 regressions; docs/coordination/dry-run gates
- Fixtures: synthetic normalized/cache paths and opaque integer statuses
- Fidelity evidence: request insertion, terminal FIFO, metrics and clear transitions
- Performance budget: 100 cycles over 256 request completions under 1 second

## Documentation deliverables

- Inline public API docs
- Module specification with inputs/outputs, ownership and source map
- Data-flow, lifecycle/state, sequence and dependency diagrams
- Adjacent M2/world-renderer/module-registry/RENDER updates

## Simplicity and naming

- Important name introduced: `M2AnimationLoadPipelineState`
- Simplest solution: one main-thread RefCounted with pending map and finalize FIFO
- Rejected complexity: generic Resource pipeline, signals, callbacks, typed
  ResourceLoader enum wrapper, Node ownership or async abstraction
- Unavoidable complexity: pending insertion order and terminal completion order differ
- Measured optimization evidence: bounded synthetic transition loop

## Status

- State: ready for integration
- Done: state, loader adapters, lifecycle verifier and required documentation
- Next: integrate on master and run post-merge acceptance gates
- Blocked by:

## Handoff

- Commit: `b8e0f11`
- Results: animation pipeline passes 11 validation/dedupe/order/transition/FIFO/
  discard/snapshot/source cases and 100-by-256 cycles in 69.798 ms; all 47
  autonomous headless verifiers pass, while the proprietary ADT placement probe
  is unavailable without `data/extracted`; checkpoint dry-run passes 7/7;
  documentation and coordination gates pass; loader-private inventory decreases
  from 31 to 30.
- Remaining risks: successful animated-GLB traversal, descriptor pressure,
  leaks, animation fidelity and p95/p99 require proprietary data; no paired
  original-client visual comparison is claimed.
- Documentation updated: inline API; `m2-animation-load-pipeline-state.md` with
  data-flow, lifecycle, sequence and dependency diagrams; prototype/world-renderer
  specs, module registry and `RENDER.md`.

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