Rebuild local Blender WASM environment and recovery evidence

docs/tasks/WBV2-P8-003.md

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+# WBV2-P8-003: authorize M12 provenance epoch
+
+- task: WBV2-P8-003
+- parent: WBV2-P8-002
+- status: in_progress
+- gap: workflow:authorize_m12_provenance_epoch
+- ownerFamily: PROGRAM
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Preserve 22 exact M12 originals and bind 62 unavailable records to an explicit authorized recovery baseline without calling replacements restored originals.
+
+## 输入与范围
+
+- Drift report: `tests/golden/corrective/rehydration/M12-manifest-sha-drift.json`
+- Intake: `tests/golden/corrective/rehydration/M12-provenance-intake.json`
+- Generator: `tools/web/generate-m12-provenance-epoch.mjs`
+
+## 验收
+
+node tools/web/generate-m12-provenance-epoch.mjs --write
+node tools/web/check-task-context.mjs --task WBV2-P8-003 --write
+
+Missing replacement, malformed provenance, unsupported source, mismatched SHA, false restored-original claim, or historical evidence rewrite must keep in_progress and must not advance nextTask.
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P8-003/`
+- Status: `docs/status/WBV2-P8-003.md`
+- Manifest: `tests/golden/WBV2-P8-003/manifest.json`
+- Rollback: restore P8-002 as queue parent; keep the M12 drift report unchanged.