Stability checkpoint stable-v1.0.22 (UI) — Phase 4.1 subscribe-leak cleanup: 76 RxJS .subscribe() calls now properly tied to a DestroyRef via takeUntilDestroyed(). 14 components migrated (quality, dashboard, security, chaos, customers, diagnostic, database, activity, settings, login, request-builder, pipelines, audit, maven-site-full) + 1 service (FeatureFlagService). Post-merge main pipeline #374 SUCCESS.