feat(agents): implement Code Commander module (Phases 1-5)

- Phase 1: Infrastructure (state, prompts, registry)
- Phase 2: Execution engine (AI adapters, security classifier, executors)
- Phase 3: Agent integration (graph nodes, routing)
- Phase 4: Streaming interaction (PTY terminal, WebSocket)
- Phase 5: Frontend integration (Vue components)

backend/app/routers/__init__.py

@@ -20,3 +20,4 @@ from app.routers.plugins import router as plugins_router
 from app.routers.plugins import _marketplace_router as marketplace_router
 from app.routers.agent_skills import router as agent_skills_router
 from app.routers.agent_sessions import router as agent_sessions_router
+from app.routers.terminal import router as terminal_router