docs: module dossier + install/quickstart sync for truthful cutover sprints

- API_CLI_REFERENCE.md, INSTALL_GUIDE.md, quickstart.md, architecture/integrations.md, dev/DEV_ENVIRONMENT_SETUP.md, integrations/LOCAL_SERVICES.md: reflect real-service wiring.
- docs/modules/**: module dossier updates across the modules touched by SPRINT_20260415_001..007 + SPRINT_20260416_003..017 + SPRINT_20260417_018..024 + SPRINT_20260418_025 + SPRINT_20260419_026.
- docs/features/checked/web/**: update feature notes where UI changed.
- docs/qa/feature-checks/runs/web/evidence-presentation-ux/: QA evidence artifacts.
- docs/setup/**, docs/technical/**: align with setup wizard contracts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/modules/reach-graph/architecture.md

@@ -248,11 +248,11 @@ The unified query interface is backed by two adapters:
    - Uses BFS from entrypoints to target symbols
    - Returns `StaticReachabilityResult` with distance, path, and evidence URIs
 
-2. **InMemorySignalsAdapter**: Implements `ISignalsAdapter` from `StellaOps.Reachability.Core`
-   - Queries runtime observation facts
-   - Supports observation window filtering
-   - Returns `RuntimeReachabilityResult` with hit count, contexts, and evidence URIs
-   - Note: Production deployments should integrate with the actual Signals runtime service
+2. **SignalsHttpAdapter**: Implements `ISignalsAdapter` from `StellaOps.Reachability.Core`
+   - Queries runtime observation facts from the live Signals service over HTTP
+   - Resolves the base URL from `Signals:BaseUrl`, `STELLAOPS_SIGNALS_URL`, or the local `signals.stella-ops.local` alias
+   - Pulls `GET /signals/facts/{subjectKey}` and translates the stored reachability fact into `RuntimeReachabilityResult`
+   - The in-memory adapter remains test-only and is no longer wired into the live host
 
 ### Hybrid Query Flow