docs(21-06): complete integration smoke test plan

Tasks completed: 2/2
- Run full build verification (TypeScript, Vite, tests)
- Full integration smoke test (human-verified, approved)

SUMMARY: .planning/phases/21-polish-integration/21-06-SUMMARY.md

.planning/phases/21-polish-integration/21-06-SUMMARY.md

@@ -0,0 +1,90 @@
+---
+phase: 21-polish-integration
+plan: 06
+subsystem: ui
+tags: [integration-test, smoke-test, verification, frontend]
+
+# Dependency graph
+requires:
+  - phase: 21-04
+    provides: Subscription error handling with toast notifications
+  - phase: 21-05
+    provides: Code splitting, PlanTasksFetcher render fix
+provides:
+  - Verified frontend ready to ship as v2.0
+  - Full build pipeline confirmed (TypeScript, Vite, tests)
+  - Human-verified all screens, navigation, error handling, and loading states
+affects: []
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: []
+
+key-files:
+  created: []
+  modified: []
+
+key-decisions:
+  - "No code changes needed — verification-only plan confirming all Phase 21 work integrates correctly"
+
+patterns-established: []
+
+# Metrics
+duration: 2min
+completed: 2026-02-05
+---
+
+# Phase 21 Plan 06: Integration Smoke Test Summary
+
+**Full build pipeline and human-verified end-to-end smoke test confirming v2.0 frontend readiness**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-02-05
+- **Completed:** 2026-02-05
+- **Tasks:** 2
+- **Files modified:** 0
+
+## Accomplishments
+- Full build verification passed: TypeScript (backend + frontend), Vite production build, all tests green
+- No `console.error` calls remaining in component source files
+- Human smoke test approved: dashboard, detail, inbox, error handling, 404, loading states, and navigation all verified end-to-end
+
+## Task Commits
+
+This was a verification-only plan with no code changes:
+
+1. **Task 1: Run full build verification** - (no commit - verification only)
+2. **Task 2: Full integration smoke test** - (no commit - human-verify checkpoint, approved)
+
+**Plan metadata:** committed with SUMMARY + STATE + ROADMAP update
+
+## Files Created/Modified
+None - verification-only plan.
+
+## Decisions Made
+None - followed plan as specified. All prior Phase 21 work verified as correct.
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Phase 21 complete. All 6 plans finished.
+- v2.0 Frontend milestone ready to ship.
+- All screens verified: dashboard, initiative detail, agent inbox, 404
+- Error handling confirmed: toast notifications, persistent SSE disconnect warning, graceful degradation
+- Loading states confirmed: skeleton loading cards, rows, and layout
+- Navigation confirmed: cross-screen links, mobile responsive drill-down, back buttons
+
+---
+*Phase: 21-polish-integration*
+*Completed: 2026-02-05*