# WBV2-P29-003: implement_compositor_sequencer_datablock

- task: WBV2-P29-003
- parent: WBV2-P29-002
- status: in_progress
- gap: RENDER.COMPOSITOR_SEQUENCER_DATABLOCK
- ownerFamily: RENDER
- targetImplementationClass: SOURCE_BACKED

## 目标

Connect compositor and sequencer metadata to native Main data and web capability routes.

## 输入与范围

- Focused Main source: `blender-5.2.0/source/blender/web_engine/web_engine_main_state.cpp`
- Focused API: `blender-5.2.0/source/blender/web_engine/web_engine_api.cpp`
- Focused protocol: `web/protocol/web-engine.ts`
- Implementation entrypoint: `node tools/web/generate-wbv2-native-datablock-slice.mjs --task WBV2-P29-003 --write`

## 验收

- real Blender Main datablock is wired and persisted by the existing save path
- malformed, unsupported, hash-drift or false-completion input fails closed
- implementation smoke is reproducible; Chromium receipts, undo/redo, save/reopen and deterministic verification remain deferred
- `node tools/web/check-task-context.mjs --task WBV2-P29-003 --write`

## 交付与回滚

- Reports: `tests/golden/WBV2-P29-003/`
- Status: `docs/status/WBV2-P29-003.md`
- Manifest: `tests/golden/WBV2-P29-003/manifest.json`
- Rollback: restore WBV2-P29-002 as queue parent and leave the slice in_progress.