# WBV2-P1124-000: historical hash drift evidence

- task: `WBV2-P1124-000`
- parent: `WBV2-P1123-000`
- status: `in_progress`
- gap: `workflow:historical_hash_drift`
- ownerFamily: `PROVENANCE`
- targetImplementationClass: `LOCAL_BOUNDED`

## 目标

按既定纠偏协议记录旧 M12 artifact 的 original/observed SHA-256，不重签历史 manifest，不修改 6900 inventory。

## 输入与范围

- Drift checker: `tools/web/check-m12-manifest-drift.mjs`
- Report: `tests/golden/corrective/rehydration/M12-manifest-sha-drift.json`
- Immutable inventory: `tests/golden/WBV2-P0-002/parity-map.json`

## 验收

```bash
node tools/web/check-m12-manifest-drift.mjs --write
node tools/web/check-m12-manifest-drift.mjs
node tools/web/check-wbv2-module-execution.mjs
```

必须保持 `historicalEvidencePreserved=true`、`provenanceState=BLOCKED_SOURCE_LOST`，记录 affected tasks/path；原 manifest 和 inventory 不得被更新。

## 失败边界

任何 drift report 不可重现、原始 bytes 恢复失败、旧 manifest 被改写或 inventory hash 变化，都必须保持任务 `in_progress/blocked`，不得推进后续 capability 模块。

## 交付与回滚

- Receipt: `tests/golden/WBV2-P1124-000/module-receipt.json`
- Manifest: `tests/golden/WBV2-P1124-000/manifest.json`
- Status: `docs/status/WBV2-P1124-000.md`
- 回滚：恢复 P1123 manifest 为 queue parent并保留 drift report。