{
  "type": "init",
  "config": {
    "language": "en",
    "sample_rate": 16000,
    "encoding": "linear16",
    "enable_partials": true
  }
}

{
  "type": "audio",
  "data": "UklGRiQAAABXQVZFZm10IBAAAAABAAEA..."
}

{
  "type": "finalize"
}

{
  "type": "ready",
  "session_id": "sess_abc123"
}

{
  "type": "partial_transcript",
  "transcript": "Hello wor",
  "confidence": 0.85
}

{
  "type": "final_transcript",
  "transcript": "Hello world",
  "confidence": 0.95,
  "language": "en",
  "duration": 2.5
}

{
  "type": "error",
  "code": "provider_error",
  "message": "Upstream service unavailable"
}