# WBV2-P1120-000: Volume NanoVDB module

- task: `WBV2-P1120-000`
- parent: `WBV2-P1119-000`
- status: `in_progress`
- gap: `workflow:module_volume_nanovdb`
- ownerFamily: `MEDIA`
- targetImplementationClass: `LOCAL_BOUNDED`

## 目标

按功能模块验证 NanoVDB manifest/chunk identity、paged feedback、OPFS commit/restart、WebGPU availability 和 main/offscreen viewport roundtrip。

## 输入与范围

- Protocol: `web/protocol/volume-vdb.ts`, `web/protocol/nanovdb-page-feedback.ts`, `web/protocol/nanovdb-device-recovery.ts`, `web/protocol/storage.ts`
- Volume implementation: `web/app/src/volume/nanovdb-opfs.ts`, `web/app/src/volume/nanovdb-stream.ts`, `web/app/src/volume/nanovdb-viewport.ts`, `web/app/src/volume/nanovdb-float32.ts`, `web/app/src/render/nanovdb-volume-renderer.ts`
- Workers/UI: `web/app/src/workers/vdb-opfs-test.worker.ts`, `web/app/src/workers/storage.worker.ts`, `web/app/src/app/App.tsx`

## 验收

```bash
npm --prefix web run test:vdb-availability
npm --prefix web run test:vdb-native
npm --prefix web run test:nanovdb-page-feedback
npm --prefix web run test:nanovdb-opfs-restart
npm --prefix web run test:nanovdb-volume-roundtrip
npm --prefix web run typecheck
```

必须记录 manifest/chunk 正例、hash/stale/WebGPU block 负例、OPFS restart、feedback resume、quota/device cleanup、main/offscreen viewport 和 Chromium save/reopen。OpenVDB browser decoder 关闭、advanced material blocked 等能力保持显式。

## 交付与回滚

- Receipt: `tests/golden/WBV2-P1120-000/module-receipt.json`
- Manifest: `tests/golden/WBV2-P1120-000/manifest.json`
- Status: `docs/status/WBV2-P1120-000.md`
- 回滚：恢复 P1119 manifest 为 queue parent。