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_110_ingestion_evidence.md

@@ -91,7 +91,7 @@ CONCELIER-ATTEST-73-002 `Transparency metadata` | TODO | Ensure Conseiller expos
 CONCELIER-CONSOLE-23-001 `Advisory aggregation views` | TODO | Expose `/console/advisories` endpoints returning aggregation groups (per linkset) with source chips, provider-reported severity columns (no local consensus), and provenance metadata for Console list + dashboard cards. Support filters by source, ecosystem, published/modified window, tenant enforcement. Dependencies: CONCELIER-LNM-21-201, CONCELIER-LNM-21-202. | Concelier WebService Guild, BE-Base Platform Guild (src/Concelier/StellaOps.Concelier.WebService/TASKS.md)
 CONCELIER-CONSOLE-23-002 `Dashboard deltas API` | TODO | Provide aggregated advisory delta counts (new, modified, conflicting) for Console dashboard + live status ticker; emit structured events for queue lag metrics. Ensure deterministic counts across repeated queries. Dependencies: CONCELIER-CONSOLE-23-001, CONCELIER-LNM-21-203. | Concelier WebService Guild (src/Concelier/StellaOps.Concelier.WebService/TASKS.md)
 CONCELIER-CONSOLE-23-003 `Search fan-out helpers` | TODO | Deliver fast lookup endpoints for CVE/GHSA/purl search (linksets, observations) returning evidence fragments for Console global search; implement caching + scope guards. Dependencies: CONCELIER-CONSOLE-23-001. | Concelier WebService Guild (src/Concelier/StellaOps.Concelier.WebService/TASKS.md)
-CONCELIER-CORE-AOC-19-004 `Remove ingestion normalization` | DOING (2025-10-28) | Strip normalization/dedup/severity logic from ingestion pipelines, delegate derived computations to Policy Engine, and update exporters/tests to consume raw documents only.<br>2025-10-29 19:05Z: Audit completed for `AdvisoryRawService`/Mongo repo to confirm alias order/dedup removal persists; identified remaining normalization in observation/linkset factory that will be revised to surface raw duplicates for Policy ingestion. Change sketch + regression matrix drafted under `docs/dev/aoc-normalization-removal-notes.md` (pending commit).<br>2025-10-31 20:45Z: Added raw linkset projection to observations/storage, exposing canonical+raw views, refreshed fixtures/tests, and documented behaviour in models/doc factory.<br>2025-10-31 21:10Z: Coordinated with Policy Engine (POLICY-ENGINE-20-003) on adoption timeline; backfill + consumer readiness tracked in `docs/dev/raw-linkset-backfill-plan.md`.<br>2025-11-05 14:20Z: Resumed work to map remaining normalization hooks tied to Merge service and capture requirements for the upcoming `noMergeEnabled` feature toggle.<br>2025-11-05 19:05Z: Hardened no-merge feature flag wiring by suppressing obsolete diagnostics and extending gating tests.<br>2025-11-06 16:10Z: Updated AOC references/backfill plan with raw-vs-canonical guidance and noted analyzer guardrails introduced under MERGE-LNM-21-002. Dependencies: CONCELIER-CORE-AOC-19-002, POLICY-AOC-19-003. | Concelier Core Guild (src/Concelier/__Libraries/StellaOps.Concelier.Core/TASKS.md)
+CONCELIER-CORE-AOC-19-004 `Remove ingestion normalization` | DONE (2025-11-06) | Strip normalization/dedup/severity logic from ingestion pipelines, delegate derived computations to Policy Engine, and update exporters/tests to consume raw documents only.<br>2025-10-29 19:05Z: Audit completed for `AdvisoryRawService`/Mongo repo to confirm alias order/dedup removal persists; identified remaining normalization in observation/linkset factory that will be revised to surface raw duplicates for Policy ingestion. Change sketch + regression matrix drafted under `docs/dev/aoc-normalization-removal-notes.md` (pending commit).<br>2025-10-31 20:45Z: Added raw linkset projection to observations/storage, exposing canonical+raw views, refreshed fixtures/tests, and documented behaviour in models/doc factory.<br>2025-10-31 21:10Z: Coordinated with Policy Engine (POLICY-ENGINE-20-003) on adoption timeline; backfill + consumer readiness tracked in `docs/dev/raw-linkset-backfill-plan.md`.<br>2025-11-05 14:20Z: Resumed work to map remaining normalization hooks tied to Merge service and capture requirements for the upcoming `noMergeEnabled` feature toggle.<br>2025-11-05 19:05Z: Hardened no-merge feature flag wiring by suppressing obsolete diagnostics and extending gating tests.<br>2025-11-06 16:10Z: Updated AOC references/backfill plan with raw-vs-canonical guidance and noted analyzer guardrails introduced under MERGE-LNM-21-002.<br>2025-11-06 23:40Z: Raw observations now flow unaltered (casing + whitespace preserved) with case-insensitive filters/tests refreshed; docs aligned. Tests: `StellaOps.Concelier.Models/Core/Storage.Mongo.Tests` green on .NET 10 preview. Dependencies: CONCELIER-CORE-AOC-19-002, POLICY-AOC-19-003. | Concelier Core Guild (src/Concelier/__Libraries/StellaOps.Concelier.Core/TASKS.md)
 CONCELIER-CORE-AOC-19-013 `Authority tenant scope smoke coverage` | TODO | Extend Concelier smoke/e2e fixtures to configure `requiredTenants` and assert cross-tenant rejection with updated Authority tokens. Dependencies: AUTH-AOC-19-002. | Concelier Core Guild (src/Concelier/__Libraries/StellaOps.Concelier.Core/TASKS.md)
 
 
@@ -210,7 +210,7 @@ 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 | 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.<br>2025-11-05 14:42Z: Drafting `concelier:features:noMergeEnabled` gating, merge job allowlist handling, and deprecation/telemetry changes prior to analyzer rollout.<br>2025-11-06 16:10Z: Landed analyzer project (`CONCELIER0002`), wired into Concelier WebService/tests, and updated docs to direct suppressions through explicit migration notes. | BE-Merge (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.<br>2025-11-05 14:42Z: Drafting `concelier:features:noMergeEnabled` gating, merge job allowlist handling, and deprecation/telemetry changes prior to analyzer rollout.<br>2025-11-06 16:10Z: Landed analyzer project (`CONCELIER0002`), wired into Concelier WebService/tests, and updated docs to direct suppressions through explicit migration notes.<br>2025-11-06 23:45Z: Analyzer enforcement merged; DI removal + flag defaults pending. Analyzer test project blocked by offline feed (`Microsoft.Bcl.AsyncInterfaces >= 8.0` missing) — rerun once nuget mirror refreshed. | 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)