When a job completes, the enricher will POST to the source's webhook URL with the following payload:

{
  "event": "job.completed",        // job.completed | job.failed | job.review
  "job_id": "uuid",
  "professional_id": "abc-123",    // echoed back from submission
  "status": "completed",
  "enriched_profile": {...},       // if completed
  "confidence": 0.85,
  "error": null,                   // if failed
  "cost_usd": 0.0234,
  "steps_used": 8,
  "job_url": "https://enricher.../console/jobs/{id}?token={jwt}"
}

The webhook includes an X-Webhook-Signature header with an HMAC-SHA256 signature using the source's secret key.