chore: complete v1.0 Analytics & Monitoring milestone

Archive milestone artifacts (roadmap, requirements, audit, phase directories)
to .planning/milestones/. Evolve PROJECT.md with validated requirements and
decision outcomes. Create MILESTONES.md and RETROSPECTIVE.md.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/milestones/v1.0-phases/04-frontend/04-02-SUMMARY.md

@@ -0,0 +1,114 @@
+---
+phase: 04-frontend
+plan: 02
+subsystem: ui
+tags: [react, typescript, app-tsx, alert-banner, admin-monitoring]
+
+# Dependency graph
+requires:
+  - phase: 04-frontend
+    plan: 01
+    provides: "AlertBanner component, AdminMonitoringDashboard component, AlertEvent type, adminService.getAlerts/acknowledgeAlert"
+provides:
+  - "Dashboard with AlertBanner above nav wired to adminService.getAlerts"
+  - "Monitoring tab replaced with AdminMonitoringDashboard"
+  - "Optimistic alert acknowledge with re-fetch fallback"
+affects: []
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Optimistic UI: filter local state immediately on acknowledge, re-fetch on API failure"
+    - "Admin-gated data fetching: isAdmin dependency in useEffect prevents unnecessary API calls"
+    - "AlertBanner above nav: conditional render before <nav> so banner shows on all tabs"
+
+key-files:
+  created: []
+  modified:
+    - frontend/src/App.tsx
+
+key-decisions:
+  - "AlertBanner placed before <nav> element so it shows across all tabs, not scoped to monitoring tab"
+  - "handleAcknowledge uses optimistic update (filter state immediately) with re-fetch on failure"
+  - "Alert fetch gated by isAdmin — non-admin users never trigger getAlerts API call"
+  - "UploadMonitoringDashboard import removed entirely — replaced by AdminMonitoringDashboard"
+
+requirements-completed:
+  - ALRT-03
+  - ANLY-02
+  - HLTH-01
+
+# Metrics
+duration: 2min
+completed: 2026-02-24
+---
+
+# Phase 04 Plan 02: Wire AlertBanner and AdminMonitoringDashboard into App.tsx Summary
+
+**AlertBanner wired above navigation in Dashboard with optimistic acknowledge, AdminMonitoringDashboard replacing UploadMonitoringDashboard in monitoring tab**
+
+## Performance
+
+- **Duration:** ~2 min
+- **Started:** 2026-02-24T21:37:58Z
+- **Completed:** 2026-02-24T21:39:36Z
+- **Tasks:** 1 auto + 1 checkpoint (pending visual verification)
+- **Files modified:** 1
+
+## Accomplishments
+
+- Added `AlertBanner` and `AdminMonitoringDashboard` imports to `frontend/src/App.tsx`
+- Added `AlertEvent` type import from `adminService`
+- Added `activeAlerts` state (AlertEvent[]) inside Dashboard component
+- Added `useEffect` gated by `isAdmin` to fetch alerts on mount
+- Added `handleAcknowledge` callback with optimistic update (immediate filter) and re-fetch on failure
+- Rendered `AlertBanner` above `<nav>` so it appears on all tabs when admin has active alerts
+- Replaced `UploadMonitoringDashboard` with `AdminMonitoringDashboard` in monitoring tab
+- Removed unused `UploadMonitoringDashboard` import
+- `npx tsc --noEmit` passes with zero errors
+- `npm run build` succeeds
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Wire AlertBanner and AdminMonitoringDashboard into Dashboard** - `6c345a6` (feat)
+
+## Files Created/Modified
+
+- `frontend/src/App.tsx` - Added AlertBanner above nav, added alert state and optimistic acknowledge, replaced UploadMonitoringDashboard with AdminMonitoringDashboard in monitoring tab
+
+## Decisions Made
+
+- AlertBanner is placed before the `<nav>` element (not inside a tab) so it appears globally on every tab when the admin has active critical alerts
+- Optimistic update pattern: `setActiveAlerts(prev => prev.filter(a => a.id !== id))` fires before the API call, restoring state on failure via re-fetch
+- Alert fetch is fully gated on `isAdmin` in the `useEffect` dependency array — non-admin users never call `adminService.getAlerts()`
+- `UploadMonitoringDashboard` import was removed entirely since AdminMonitoringDashboard replaces it
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+Task 2 is a `checkpoint:human-verify` — admin must visually verify the monitoring tab and alert banner in the running application.
+
+## Next Phase Readiness
+
+- Phase 4 is complete pending human visual verification (Task 2 checkpoint)
+- All requirements ALRT-03, ANLY-02, HLTH-01 are now fully implemented frontend-to-backend
+
+## Self-Check: PASSED
+
+- `04-02-SUMMARY.md` exists at `.planning/phases/04-frontend/04-02-SUMMARY.md`
+- `frontend/src/App.tsx` exists and modified
+- Commit `6c345a6` exists in git log
+
+---
+*Phase: 04-frontend*
+*Completed: 2026-02-24*