feat: Add MongoIdempotencyStoreOptions for MongoDB configuration

feat: Implement BsonJsonConverter for converting BsonDocument and BsonArray to JSON

fix: Update project file to include MongoDB.Bson package

test: Add GraphOverlayExporterTests to validate NDJSON export functionality

refactor: Refactor Program.cs in Attestation Tool for improved argument parsing and error handling

docs: Update README for stella-forensic-verify with usage instructions and exit codes

feat: Enhance HmacVerifier with clock skew and not-after checks

feat: Add MerkleRootVerifier and ChainOfCustodyVerifier for additional verification methods

fix: Update DenoRuntimeShim to correctly handle file paths

feat: Introduce ComposerAutoloadData and related parsing in ComposerLockReader

test: Add tests for Deno runtime execution and verification

test: Enhance PHP package tests to include autoload data verification

test: Add unit tests for HmacVerifier and verification logic

docs/implplan/SPRINT_0512_0001_0001_bench.md

@@ -46,6 +46,7 @@
 
 ## Upcoming Checkpoints
 - 2025-11-22 · Confirm availability of graph fixtures for BENCH-GRAPH-21-001/002/24-002. Owner: Bench Guild.
+- 2025-11-23 · Escalate to Graph Platform Guild if SAMPLES-GRAPH-24-003 location still missing; confirm interim synthetic path (ACT-0512-04). Owner: Bench Guild.
 - 2025-11-24 · Reachability schema alignment outcome to unblock BENCH-SIG-26-001. Owner: Signals Guild.
 - 2025-11-26 · Decide impact index dataset for BENCH-IMPACT-16-001. Owner: Scheduler Team.
 
@@ -55,19 +56,25 @@
 | ACT-0512-01 | PENDING | Bench Guild | 2025-11-22 | Confirm SAMPLES-GRAPH-24-003 fixtures availability and publish location for BENCH-GRAPH-21-001/002/24-002. |
 | ACT-0512-02 | PENDING | Signals Guild | 2025-11-24 | Provide reachability schema hash/output to unblock BENCH-SIG-26-001/002. |
 | ACT-0512-03 | PENDING | Scheduler Team | 2025-11-26 | Finalize impact index dataset selection and share deterministic replay bundle. |
+| ACT-0512-04 | PENDING | Bench Guild | 2025-11-24 | Prepare interim synthetic 50k/100k graph fixture (documented in `samples/graph/fixtures-plan.md`) to start BENCH-GRAPH-21-001 harness while waiting for SAMPLES-GRAPH-24-003. |
+| ACT-0512-05 | PENDING | Bench Guild | 2025-11-23 | If SAMPLES-GRAPH-24-003 still unavailable, escalate to Graph Platform Guild and post slip/ETA in Execution Log + risk table. |
 
 ## Decisions & Risks
 | Risk | Impact | Mitigation | Status | Owner | Due (UTC) |
 | --- | --- | --- | --- | --- | --- |
-| Graph fixtures SAMPLES-GRAPH-24-003 not delivered | Blocks BENCH-GRAPH-21-001/002/24-002; benches unstartable | Track via ACT-0512-01; escalate to Graph Platform Guild if missed | Open | Bench Guild | 2025-11-22 |
+| Graph fixtures SAMPLES-GRAPH-24-003 not delivered | Blocks BENCH-GRAPH-21-001/002/24-002; benches unstartable | Track via ACT-0512-01; ACT-0512-05 escalation if missed | At risk | Bench Guild | 2025-11-22 |
 | Reachability schema hash pending from Sprint 0400/0401 | BENCH-SIG-26-001/002 remain blocked | ACT-0512-02 to deliver schema hash + fixtures; add fallback synthetic set | Open | Signals Guild | 2025-11-24 |
 | Impact index dataset undecided | BENCH-IMPACT-16-001 stalled; no reproducibility | ACT-0512-03 to finalize dataset; require deterministic replay bundle | Open | Scheduler Team | 2025-11-26 |
 
+- Graph fixture still blocked per `docs/implplan/SPRINT_0509_0001_0001_samples.md` (overlay decision checkpoint 2025-11-22 unmet as of review); expect location or slip update.
 - Determinism risk: ensure all benches avoid online dependencies and pin datasets; review when fixtures arrive.
 
 ## Execution Log
 | Date (UTC) | Update | Owner |
 | --- | --- | --- |
+| 2025-11-22 | Added ACT-0512-04 to build interim synthetic graph fixture so BENCH-GRAPH-21-001 can start while awaiting SAMPLES-GRAPH-24-003; no status changes. | Project Mgmt |
+| 2025-11-22 | Added ACT-0512-05 escalation path (due 2025-11-23) if SAMPLES-GRAPH-24-003 remains unavailable; updated Upcoming Checkpoints accordingly. | Project Mgmt |
+| 2025-11-22 | Reviewed dependencies: SAMPLES-GRAPH-24-003 still BLOCKED in SPRINT_0509_0001_0001_samples; ACT-0512-01 remains pending and risk set to At risk. | Project Mgmt |
 | 2025-11-22 | Normalised sprint to implplan template (added Wave/Interlocks/Action sections; renamed Next Checkpoints → Upcoming Checkpoints); no task status changes. | Project Mgmt |
 | 2025-11-20 | Completed PREP-BENCH-GRAPH-21-002: published UI bench prep doc at `docs/benchmarks/graph/bench-graph-21-002-prep.md`; status set to DONE. | Implementer |
 | 2025-11-20 | Completed PREP-BENCH-IMPACT-16-001: published impact index bench prep doc at `docs/benchmarks/impact/bench-impact-16-001-prep.md`; status set to DONE. | Implementer |