chore(docs+devops): cross-module doc sync + sprint archival moves + compose updates

Bundled pre-session doc + ops work:
- docs/modules/**: sync across advisory-ai, airgap, cli, excititor,
  export-center, findings-ledger, notifier, notify, platform, router,
  sbom-service, ui, web (architectural + operational updates)
- docs/features/**: updates to checked excititor vex pipeline,
  developer workspace, quick verify drawer
- docs top-level: README, quickstart, API_CLI_REFERENCE, UI_GUIDE,
  code-of-conduct/TESTING_PRACTICES updates
- docs/qa/feature-checks/: FLOW.md + excititor state update
- docs/implplan/: remaining sprint updates + new Concelier source
  credentials sprint (SPRINT_20260422_003)
- docs-archived/implplan/: 30 sprint archival moves (ElkSharp series,
  misc completed sprints)
- devops/compose: .env + services compose + env example + router gateway
  config updates

File-level granularity preserved.

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

docs/modules/sbom-service/architecture.md

@@ -76,7 +76,7 @@
 ## 8) Determinism and offline posture
 - Stable ordering, UTC timestamps, and canonical hashing are required for all read models and ledger state.
 - The service remains offline-friendly: no external calls are required for persistence or replay.
-- `Testing` is the only supported environment for fixture-backed or in-memory fallback runtime composition when PostgreSQL is intentionally absent.
+- The service host does not compose fixture-backed or in-memory canonical stores by default. Tests that intentionally run without PostgreSQL must inject those fallbacks explicitly through their WebApplicationFactory harness.
 - Development, staging, and production runtimes now fail startup if `SbomService:PostgreSQL` is not configured.
 
 ## 9) Configuration