{
  "mutation_id": "AWR008-M2",
  "axis": "VIRTUAL_CAST",
  "changes": {
    "quality_evidence": "PASS_SYNTHETIC_REVIEW_20_OF_20_SAMPLES",
    "cost_risk": {
      "budget_units": 100,
      "estimated_units": 145,
      "evidence_ref": "synthetic://cost/vc-overrun"
    }
  },
  "prompt": "Meet the visual quality target but exceed the target render/animation budget; recompute."
}