- New rov_api package: HTTP-to-ROS2 bridge on port 8081
- GET /health: mission state, recording active, failsafe state
- POST /abort: W3 RETURN TO SAFE, publishes Bool to /rov/mission/abort
- POST /mission/start: MissionCommand START (recording no-go gate enforced)
- POST /mission/stop: MissionCommand ABORT
- Embedded rclpy node in background thread, uvicorn in main thread
- Verified end-to-end: /abort -> failsafe_monitor FSM NORMAL -> HOLD_AND_RECOVER
- Runs as argonaut-api.service (manual-start in dev, same policy as argonaut.service)
- Deferred to Stage 2b: /return_budget, /backup/*, /mission/upload
