Terminal WebSocket

WebSocket endpoint for terminal I/O.

Connect via WebSocket and send JSON messages:

• { "type": "input", "sessionId": "...", "data": "..." } - Send input
• { "type": "resize", "sessionId": "...", "cols": 80, "rows": 24 } - Resize

Receive:

• { "type": "output", "sessionId": "...", "data": "..." } - Terminal output
• { "type": "exit", "sessionId": "...", "code": 0 } - Session exit