Get context messages

curl --request GET \
  --url https://api.wacht.dev/agent/contexts/{id}/messages \
  --cookie session_id=

{
  "status": 200,
  "message": "",
  "data": {
    "data": [
      {
        "id": "msg_abc123",
        "message_type": "user",
        "content": {
          "type": "text",
          "text": "Hello, how can you help?"
        },
        "timestamp": "2024-01-15T10:30:00Z",
        "metadata": {}
      }
    ],
    "has_more": false
  },
  "session": {
    "id": "123456789012345678",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  },
  "errors": [
    {
      "code": "INVALID_CREDENTIALS",
      "message": "Invalid credentials. Please try again."
    }
  ]
}