# WBV2-P1126-000: Grease Pencil viewport module

- task: `WBV2-P1126-000`
- parent: `WBV2-P1125-000`
- status: `in_progress`
- gap: `workflow:module_grease_pencil_viewport`
- ownerFamily: `DRAWING`
- targetImplementationClass: `LOCAL_BOUNDED`

## 目标

验证 Grease Pencil 2D canvas 与主线程/Offscreen 3D viewport 的 selection revision、marquee stable IDs 和 backend convergence。使用独立端口，避免复用陈旧 Vite 进程。

## 输入与范围

- Protocol: `web/protocol/grease-pencil-selection.ts`, `web/protocol/grease-pencil-marquee.ts`
- UI/adapters: `web/app/src/app/App.tsx`, `web/app/src/three-adapter/grease-pencil.ts`, `web/app/src/three-adapter/viewport.ts`, `web/app/src/three-adapter/offscreen-viewport.ts`, `web/app/src/workers/viewport-render.worker.ts`
- Tests: `web/tests/e2e/grease-pencil-selection.spec.ts`, `web/tests/e2e/grease-pencil-marquee.spec.ts`, `web/tests/unit/grease-pencil-selection.test.mjs`, `web/tests/unit/grease-pencil-marquee.test.mjs`

## 验收

```bash
WEB_TEST_PORT=5331 npm --prefix web run test:e2e -- --workers=1 tests/e2e/grease-pencil-selection.spec.ts tests/e2e/grease-pencil-marquee.spec.ts
node --test web/tests/unit/grease-pencil-selection.test.mjs web/tests/unit/grease-pencil-marquee.test.mjs
npm --prefix web run typecheck
```

必须记录 2D/3D selection revision、主线程/Offscreen marquee 正例、stale/foreign/duplicate candidate 负例、worker restart、Main revision 不变和 Chromium。端口占用只能通过独立端口恢复，不得改写测试断言。

## 交付与回滚

- Receipt: `tests/golden/WBV2-P1126-000/module-receipt.json`
- Manifest: `tests/golden/WBV2-P1126-000/manifest.json`
- Status: `docs/status/WBV2-P1126-000.md`
- 回滚：恢复 P1125 manifest 为 queue parent。