# WBV2-P34-002: implement_library_append_workbench

- task: WBV2-P34-002
- parent: WBV2-P34-001
- status: planned
- gap: workflow:implement_library_append_workbench
- ownerFamily: LIBRARY
- targetImplementationClass: SOURCE_BACKED

## 目标

Expose the existing hash-bound Library Main append workflow through the workbench.

## 输入与范围

- Focused protocol: `web/protocol/web-engine.ts`
- Implementation entrypoint: `node tools/web/generate-wbv2-texture-slice.mjs --task WBV2-P34-002 --write`

## 验收

- real source or WebEngine Main path is wired
- worker/client/frontend route uses typed protocol without a duplicate shim
- 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-P34-002 --write`

## 失败边界

- malformed and unsupported data remains blocked with a typed diagnostic
- implementation evidence never changes historical inventory or provenance

## 交付与回滚

- Reports: `tests/golden/WBV2-P34-002/`
- Status: `docs/status/WBV2-P34-002.md`
- Manifest: `tests/golden/WBV2-P34-002/manifest.json`
- Rollback: restore WBV2-P34-001 as queue parent and leave the task in_progress.