@host = http://localhost:5100

### Send a message to the AG-UI agent
POST {{host}}/
Content-Type: application/json

{
  "threadId": "thread_123",
  "runId": "run_456",
  "messages": [
    {
      "role": "user",
      "content": "What is the capital of France?"
    }
  ],
  "context": {}
}
