feat: Implement vulnerability token signing and verification utilities

- Added VulnTokenSigner for signing JWT tokens with specified algorithms and keys.
- Introduced VulnTokenUtilities for resolving tenant and subject claims, and sanitizing context dictionaries.
- Created VulnTokenVerificationUtilities for parsing tokens, verifying signatures, and deserializing payloads.
- Developed VulnWorkflowAntiForgeryTokenIssuer for issuing anti-forgery tokens with configurable options.
- Implemented VulnWorkflowAntiForgeryTokenVerifier for verifying anti-forgery tokens and validating payloads.
- Added AuthorityVulnerabilityExplorerOptions to manage configuration for vulnerability explorer features.
- Included tests for FilesystemPackRunDispatcher to ensure proper job handling under egress policy restrictions.

docs/implplan/SPRINT_110_ingestion_evidence.md

@@ -158,7 +158,7 @@ FEEDMERGE-COORD-02-902 ICS-CISA version comparison support | BE-Merge, Models |
 FEEDMERGE-COORD-02-903 KISA firmware scheme review | BE-Merge, Models | **TODO (due 2025-10-24)** – Pair with KISA team on proposed firmware comparison helper (`kisa.build` or variant), ensure observation mapper alignment, and open Models ticket only if a new comparator is required. Log the final helper signature and observation coverage metrics in coordination docs + tracker files. Dependencies: FEEDMERGE-COORD-02-902. | FEEDMERGE-COORD-02-900 (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)
 Fixture validation sweep | QA | **DOING (2025-10-19)** – Prereqs confirmed none; continuing RHSA fixture regeneration and diff review alongside mapper provenance updates.<br>2025-10-29: Added `scripts/update-redhat-fixtures.sh` to regenerate golden snapshots with `UPDATE_GOLDENS=1`; run it before reviews to capture CSAF contract deltas. | None (src/Concelier/__Libraries/StellaOps.Concelier.Connector.Distro.RedHat/TASKS.md)
 Link-Not-Merge version provenance coordination | BE-Merge | **DOING** – Coordinate remaining connectors (`Acsc`, `Cccs`, `CertBund`, `CertCc`, `Cve`, `Ghsa`, `Ics.Cisa`, `Kisa`, `Ru.Bdu`, `Ru.Nkcki`, `Vndr.Apple`, `Vndr.Cisco`, `Vndr.Msrc`) so they emit `advisory_observations.affected.versions[]` entries with provenance tags and deterministic comparison keys. Track rollout status in `docs/dev/normalized-rule-recipes.md` (now updated for Link-Not-Merge) and retire the legacy merge counters as coverage transitions to linkset validation metrics.<br>2025-10-29: Added new guidance in the doc for recording observation version metadata and logging gaps via `LinksetVersionCoverage` warnings to replace prior `concelier.merge.normalized_rules*` alerts. Dependencies: CONCELIER-LNM-21-203. | CONCELIER-LNM-21-001 (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)
-MERGE-LNM-21-001 Migration plan authoring | BE-Merge, Architecture Guild | Draft `no-merge` migration playbook, documenting backfill strategy, feature flag rollout, and rollback steps for legacy merge pipeline deprecation. | CONCELIER-LNM-21-101 (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)
+MERGE-LNM-21-001 | DONE (2025-11-03) | Draft `no-merge` migration playbook, documenting backfill strategy, feature flag rollout, and rollback steps for legacy merge pipeline deprecation.<br>2025-11-03: Authored `docs/migration/no-merge.md` covering rollout phases, backfill/validation checklists, and rollback guidance; shared artefact owners. | BE-Merge, Architecture Guild (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)
 
 
 [Ingestion & Evidence] 110.B) Concelier.VII
@@ -166,7 +166,7 @@ Depends on: Sprint 110.B - Concelier.VI
 Summary: Ingestion & Evidence focus on Concelier (phase VII).
 Task ID | State | Task description | Owners (Source)
 --- | --- | --- | ---
-MERGE-LNM-21-002 Merge service deprecation | BE-Merge | Refactor or retire `AdvisoryMergeService` and related pipelines, ensuring callers transition to observation/linkset APIs; add compile-time analyzer preventing merge service usage. Dependencies: MERGE-LNM-21-001. | MERGE-LNM-21-001 (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)
+MERGE-LNM-21-002 | DOING (2025-11-03) | Refactor or retire `AdvisoryMergeService` and related pipelines, ensuring callers transition to observation/linkset APIs; add compile-time analyzer preventing merge service usage.<br>2025-11-03: Began dependency audit and call-site inventory ahead of deprecation plan; cataloging service registrations/tests referencing merge APIs. | BE-Merge (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)
 MERGE-LNM-21-003 Determinism/test updates | QA Guild, BE-Merge | Replace merge determinism suites with observation/linkset regression tests verifying no data mutation and conflicts remain visible. Dependencies: MERGE-LNM-21-002. | MERGE-LNM-21-002 (src/Concelier/__Libraries/StellaOps.Concelier.Merge/TASKS.md)