Phases: - 16. frontend-scaffold: Vite project setup, tRPC client, shadcn/ui - 17. initiative-dashboard: List view with status badges, progress bars - 18. initiative-detail: Phase/task hierarchy accordion, queue actions - 19. agent-inbox: Multi-question forms, answer submission, notifications - 20. real-time-subscriptions: WebSocket transport, subscription hooks - 21. polish-integration: Navigation, error/loading states, responsive layout