docs: add comprehensive feature documentation

- Created FEATURES.md with detailed phase-by-phase breakdown
- Updated README.md with completed features list
- Added roadmap showing 11/11 phases completed
- Documented all components, API routes, and architecture
- Added statistics and technical details
- Reference to commit hashes for each phase

This provides a complete overview of the Supervisor UI project
including all implemented features, technical architecture, and
future enhancement possibilities.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

README.md

@@ -4,12 +4,23 @@ A modern, sophisticated web interface for [Supervisor](http://supervisord.org/)
 
 ## Features
 
-- **Real-time Monitoring**: Auto-refreshing process status and system information
-- **Process Control**: Start, stop, and restart processes with a single click
-- **Modern Dashboard**: Clean, responsive interface with dark/light mode
-- **Backend Proxy**: Secure API proxy for Supervisor XML-RPC calls
+### ✅ Completed Features
+- **Real-time Updates**: Server-Sent Events for live process state changes (no manual refresh!)
+- **Process Control**: Start, stop, restart individual processes or groups
+- **Batch Operations**: Multi-select and control multiple processes at once
+- **Signal Operations**: Send Unix signals (HUP, INT, TERM, KILL, USR1, USR2, etc.)
+- **Process Stdin**: Send input directly to process standard input
+- **Log Viewer**: Real-time stdout/stderr logs with auto-scroll and clear
+- **Charts & Analytics**: Process state distribution, uptime, and group statistics
+- **Search & Filters**: Full-text search with state and group filters
+- **Keyboard Shortcuts**: Full keyboard navigation (j/k, Space, /, r, a, Esc, ?)
+- **Process Groups**: Organize and manage processes by groups
+- **Configuration Management**: View and reload Supervisor configuration
+- **Modern Dashboard**: Clean, responsive interface with connection status
+- **Type-Safe**: Full TypeScript coverage with strict mode
 - **Docker Ready**: Multi-stage Docker build for production deployment
-- **Type-Safe**: Full TypeScript coverage with Zod validation
+
+> See [FEATURES.md](./FEATURES.md) for detailed feature documentation with commit history.
 
 ## Tech Stack
 
@@ -216,19 +227,30 @@ All Supervisor operations are proxied through Next.js API routes:
 
 ## Features Roadmap
 
-- [x] Real-time process monitoring
+### Completed (11/11 phases)
+- [x] Real-time process monitoring with SSE
 - [x] Process control (start/stop/restart)
 - [x] System status dashboard
-- [x] Dark/light mode theme
-- [x] Docker deployment
-- [ ] Log viewer with real-time tailing
-- [ ] Configuration management UI
-- [ ] Process group operations
-- [ ] Batch process actions
-- [ ] Charts and metrics visualization
-- [ ] Search and filtering
-- [ ] Keyboard shortcuts
-- [ ] WebSocket support for push updates
+- [x] Log viewer with real-time tailing
+- [x] Configuration management UI
+- [x] Process group operations
+- [x] Batch process actions
+- [x] Charts and metrics visualization
+- [x] Search and filtering
+- [x] Signal operations
+- [x] Process stdin
+- [x] Keyboard shortcuts
+- [x] Server-Sent Events for push updates
+
+### Optional Future Enhancements
+- [ ] Multi-instance support (manage multiple Supervisor instances)
+- [ ] User authentication and authorization
+- [ ] Process configuration editor
+- [ ] Log export/download
+- [ ] Process dependency visualization
+- [ ] Webhook notifications
+- [ ] Mobile app (React Native)
+- [ ] Audit logging
 
 ## Development Scripts