Daemon health and contract handshake

{
  "ok": true,
  "apiVersion": "coven.daemon.v1",
  "covenVersion": "0.4.2",
  "capabilities": {
    "sessions": true,
    "events": true,
    "travel": true,
    "scheduler": true,
    "hub": true,
    "executorDispatch": true,
    "eventCursor": "sequence",
    "structuredErrors": true,
    "sessionPolicyContracts": [
      "coven.session-policy.v1"
    ]
  },
  "daemon": {
    "pid": 12345,
    "startedAt": "2026-05-09T12:00:00.000Z",
    "socket": "/home/example/.coven/coven.sock"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "Unexpected internal daemon error.",
    "details": {}
  }
}