docs: Update EXECUTION_CHECKLIST.md with Phase 15 completion

- Document 7 extraction async jobs tools added
- Document 2 A2A pipelines implemented (regression-watch, post-incident-cleanup)
- Update MCP server total to 135 tools across 18 namespaces
- Add implementation notes and fixes applied

docs/MCP+A2A/EXECUTION_CHECKLIST.md

@@ -332,6 +332,42 @@ MCP server total after this commit: **114 tools** across 17 namespaces.
 
 MCP server total after this commit: **126 tools** across 17 namespaces.
 
+## 21) Phase 15 — Highest-ROI next steps: 7 extraction async jobs tools + 2 A2A pipelines ✅ COMPLETE
+
+### Extraction async jobs tools (7 added)
+
+| Tool                                   | Description                                 |
+| -------------------------------------- | ------------------------------------------- |
+| `extraction.extractBatch`              | Batch extraction with shared configuration  |
+| `extraction.submitJob`                 | Async job submission with webhook callbacks |
+| `extraction.getJob`                    | Get job status/results by ID                |
+| `extraction.listJobs`                  | List recent async jobs                      |
+| `extraction.getProductRateLimitStatus` | Per-product or summary rate limits          |
+| `extraction.resetProductRateLimit`     | Admin rate limit reset                      |
+| `extraction.sidecarMonitoringState`    | Detailed sidecar circuit breaker state      |
+
+All tools map to existing extraction-service endpoints and require admin role.
+
+### A2A pipelines (2 added)
+
+| Pipeline              | Tool                      | Description                                               |
+| --------------------- | ------------------------- | --------------------------------------------------------- |
+| Regression Watch      | `a2a.regressionWatch`     | Monitor error clusters → auto-create diagnostics sessions |
+| Post-Incident Cleanup | `a2a.postIncidentCleanup` | Resolve clusters + delete policies + export audit logs    |
+
+Both pipelines support `dryRun` mode and use existing platform-service endpoints.
+
+### Implementation notes
+
+- Added 7 client functions to `extraction-client.ts`
+- Fixed TypeScript optional parameter error in `extractionGetProductRateLimitStatus`
+- Created pipeline files with proper Zod schemas and error handling
+- Fixed platform-client function names (`telemetryClusters` not `telemetryListClusters`)
+- Used correct `TelemetryCluster` interface properties (`id` not `clusterId`)
+- Both pipelines registered in `server.ts` via `a2a-tools.ts`
+
+MCP server total after this commit: **135 tools** across 18 namespaces.
+
 ## 11) Phase 5+ quick sanity checks
 
 - If you make telemetry policy-aware clients: