# WBV2-P1137-001: verify Metaball elements module

- task: WBV2-P1137-001
- parent: WBV2-P1137-000
- status: in_progress
- gap: workflow:metaball_elements_transaction
- ownerFamily: GEOMETRY
- targetImplementationClass: LOCAL_EXACT
- moduleId: METABALL_ELEMENTS_TRANSACTION
- Implementation entrypoint: `node tools/web/run-wbv2-module-task.mjs --task WBV2-P1137-001 --write`

## 目标

Verify the source-backed Metaball element replacement through Blender Main, protocol, Worker and Chromium recovery paths.

## 输入与范围

- Source paths:
- `blender-5.2.0/source/blender/web_engine/web_engine_api.cpp`
- `blender-5.2.0/source/blender/web_engine/web_engine_main_state.cpp`
- `blender-5.2.0/source/blender/web_engine/web_engine_main_state.h`
- `web/protocol/web-engine.ts`
- `web/app/src/workers/web-engine.worker.ts`
- `web/app/src/app/App.tsx`
- `web/tests/e2e/wbv2-metaball-elements-production.spec.ts`
- Reused receipts:
- `tests/golden/WBV2-P1101-000/manifest.json` + `tests/golden/WBV2-P1101-000/module-receipt.json`
- Production test: `web/tests/e2e/wbv2-metaball-elements-production.spec.ts`

## 验收

- Positive: Metaball element Main mutation, bounded position/radius/scale retention, save/reopen preserves elements
- Negative: unknown Metaball data ID, invalid radius, element count topology mismatch
- Recovery: undo, redo, save/reopen, Worker termination and deterministic element state
- Commands:
- `npm --prefix web run typecheck`
- `npm --prefix web run build`
- `WEB_TEST_PORT=5353 npm --prefix web run test:e2e -- --workers=1 tests/e2e/wbv2-metaball-elements-production.spec.ts`
- malformed input, missing source, hash drift or Chromium failure remains in_progress and does not advance the queue.

## 交付与回滚

- Receipt: `tests/golden/WBV2-P1137-001/module-receipt.json`
- Manifest: `tests/golden/WBV2-P1137-001/manifest.json`
- Status: `docs/status/WBV2-P1137-001.md`
- Rollback: restore WBV2-P1137-000 as the queue parent and leave this module in_progress.