Execute agent

curl --request POST \
  --url https://api.wacht.dev/agent/contexts/{id}/execute \
  --header 'Content-Type: multipart/form-data' \
  --cookie session_id= \
  --form 'message=Hello, can you help me?' \
  --form 'files=<string>' \
  --form files.items='@example-file'

{
  "status": 200,
  "message": "",
  "data": {
    "message": {
      "id": "msg_abc123",
      "message_type": "user",
      "content": {
        "type": "text",
        "text": "Hello, how can you help?"
      },
      "timestamp": "2024-01-15T10:30:00Z",
      "metadata": {}
    },
    "status": "complete",
    "tool_calls": [],
    "usage": {
      "prompt_tokens": 123,
      "completion_tokens": 123,
      "total_tokens": 123
    }
  },
  "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."
    }
  ]
}