Add MergeUsageAnalyzer to detect legacy merge service usage

- Implemented MergeUsageAnalyzer to flag usage of AdvisoryMergeService and AddMergeModule.
- Created AnalyzerReleases.Shipped.md and AnalyzerReleases.Unshipped.md for release documentation.
- Added tests for MergeUsageAnalyzer to ensure correct diagnostics for various scenarios.
- Updated project files for analyzers and tests to include necessary dependencies and configurations.
- Introduced a sample report structure for scanner output.

docs/implplan/SPRINT_130_scanner_surface.md

@@ -138,7 +138,7 @@ SCANNER-ENV-01 | TODO (2025-11-06) | Replace ad-hoc environment reads with `Stel
 SCANNER-ENV-02 | TODO (2025-11-06) | Wire Surface.Env helpers into WebService hosting (cache roots, feature flags) and document configuration. Dependencies: SCANNER-ENV-01.<br>2025-11-02: WebService bootstrap now consumes Surface.Env helpers for cache roots and feature flag toggles; configuration doc draft pending.<br>2025-11-05 14:55Z: Picking up configuration/documentation work and aligning API readiness checks with Surface.Env validation outputs.<br>2025-11-05 19:18Z: Added unit test for Surface.Env cache root binding and ensured configurator registration.<br>2025-11-06 17:05Z: Surface.Env design doc expanded with warning catalogue and release notes, README refreshed.<br>2025-11-06 07:45Z: Helm/Compose templates ship `SCANNER_SURFACE_*` defaults across dev/stage/prod/airgap/mirror profiles with rollout guidance in deploy docs.<br>2025-11-06 07:55Z: Paused; follow-up automation tracked under `DEVOPS-OPENSSL-11-001/002` and readiness tests outstanding. | Scanner WebService Guild, Ops Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)
 SCANNER-ENV-03 | TODO | Adopt Surface.Env helpers for plugin configuration (cache roots, CAS endpoints, feature toggles). Dependencies: SCANNER-ENV-02. | BuildX Plugin Guild (src/Scanner/StellaOps.Scanner.Sbomer.BuildXPlugin/TASKS.md)
 SCANNER-EVENTS-16-301 | BLOCKED (2025-10-26) | Emit orchestrator-compatible envelopes (`scanner.event.*`) and update integration tests to verify Notifier ingestion (no Redis queue coupling). | Scanner WebService Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)
-SCANNER-EVENTS-16-302 | DOING (2025-10-26) | Extend orchestrator event links (report/policy/attestation) once endpoints are finalised across gateway + console. Dependencies: SCANNER-EVENTS-16-301. | Scanner WebService Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)
+SCANNER-EVENTS-16-302 | DONE (2025-11-06) | Extend orchestrator event links (report/policy/attestation) once endpoints are finalised across gateway + console. Dependencies: SCANNER-EVENTS-16-301.<br>2025-11-06 22:55Z: Dispatcher honours configurable console/API segments; docs and samples refreshed; added regression test for custom segments. `dotnet test` previously blocked by legacy Surface cache ctor signature (tracked under Surface task).<br>2025-11-06 23:30Z: Report DSSE fixtures re-synced; Surface cache ctor drift repaired; `dotnet test src/Scanner/__Tests/StellaOps.Scanner.WebService.Tests --no-build` now green end-to-end. | Scanner WebService Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)
 SCANNER-GRAPH-21-001 | TODO | Provide webhook/REST endpoint for Cartographer to request policy overlays and runtime evidence for graph nodes, ensuring determinism and tenant scoping. | Scanner WebService Guild, Cartographer Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)
 SCANNER-LNM-21-001 | TODO | Update `/reports` and `/policy/runtime` payloads to consume advisory/vex linksets, exposing source severity arrays and conflict summaries alongside effective verdicts. | Scanner WebService Guild, Policy Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)
 SCANNER-LNM-21-002 | TODO | Add evidence endpoint for Console to fetch linkset summaries with policy overlay for a component/SBOM, including AOC references. Dependencies: SCANNER-LNM-21-001. | Scanner WebService Guild, UI Guild (src/Scanner/StellaOps.Scanner.WebService/TASKS.md)