# WBV2-P26-004: implement_render_compositor_sequencer

- task: WBV2-P26-004
- parent: WBV2-P26-003
- status: in_progress
- gap: RENDER.COMPOSITOR_SEQUENCER
- ownerFamily: RENDER
- targetImplementationClass: SOURCE_BACKED

## 目标

Connect render, compositor, sequencer and media playback surfaces.

## 输入与范围

- Focused source: `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-advanced-slice.mjs --task WBV2-P26-004 --write`

## 验收

- real source or WebEngine Main implementation is present and connected
- 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-P26-004 --write`

## 交付与回滚

- Reports: `tests/golden/WBV2-P26-004/`
- Status: `docs/status/WBV2-P26-004.md`
- Manifest: `tests/golden/WBV2-P26-004/manifest.json`
- Rollback: restore WBV2-P26-003 as queue parent and leave the slice in_progress.