- New /actiontrail page with 4 tabs: Timeline, Agents, Alerts, Approvals
- Summary cards: total actions, critical/high count, pending approvals, active alerts
- Risk-level filtering on timeline, color-coded risk badges
- Server-side API proxy route (/api/actiontrail) to ActionTrail backend (port 4018)
- actiontrail-client.ts: typed API client using @bytelyst/api-client
- Sidebar nav item with Crosshair icon
- ACTIONTRAIL_SERVICE_URL added to .env.example
- Graceful fallback when ActionTrail service is unavailable
