Batch Progress Tracker

Track and report batch processing progress:

BATCH STATUS:
[Current state of all batches]

GENERATE PROGRESS REPORT:
{
  "overall_progress": {
    "percent_complete": number,
    "items_processed": number,
    "items_remaining": number,
    "elapsed_time": "duration",
    "estimated_remaining": "duration"
  },
  "batch_status": [
    {
      "batch_id": number,
      "status": "pending | processing | complete | failed",
      "progress": percentage,
      "items_processed": number,
      "errors": number
    }
  ],
  "performance": {
    "items_per_minute": number,
    "average_time_per_item": "duration",
    "error_rate": percentage
  },
  "issues": [
    {
      "batch_id": number,
      "issue": "description",
      "severity": "blocking | degraded | minor"
    }
  ]
}

RECOMMENDATIONS:
- Should we continue, pause, or abort?
- Any batches to retry?