# WBV2-P9-004: feature parity gate

- task: WBV2-P9-004
- parent: WBV2-P9-003
- status: in_progress
- gap: workflow:recompute_feature_parity_gate
- ownerFamily: RELEASE
- targetImplementationClass: LOCAL_BOUNDED

## 目标

Recompute declared feature parity claims only from the three production Chromium receipts and preserve the authorized-rebaseline-only release boundary.

## 输入与范围

- Mesh receipt: `tests/golden/WBV2-P9-001/mesh-receipt-report.json`
- Modifier receipt: `tests/golden/WBV2-P9-002/modifier-receipt-report.json`
- Asset receipt: `tests/golden/WBV2-P9-003/asset-catalog-receipt-report.json`
- M12 approval: `docs/status/M12-PROVENANCE-EPOCH-2-APPROVAL.json`

## 验收

- `node tools/web/generate-wbv2-feature-parity-gate.mjs --write`
- `node tools/web/check-task-context.mjs --task WBV2-P9-004 --write`

Missing receipt, hash drift, unsupported browser, non-exact save/reopen, false historical reproduction, or undeclared feature claim must keep in_progress and must not advance nextTask.

## 交付与回滚

- Reports: `tests/golden/WBV2-P9-004/`
- Status: `docs/status/WBV2-P9-004.md`
- Manifest: `tests/golden/WBV2-P9-004/manifest.json`
- Rollback: restore P9-003 as queue parent without modifying any production receipt or provenance evidence.