{
  "artifact": "model-fallback-decision-tree",
  "triggers": ["availability", "latency", "quality", "cost", "policy", "incident"],
  "fallbackModes": ["alternateModel", "cachedAnswer", "degradedMode", "humanEscalation", "temporaryShutdown"],
  "requiredEvidence": ["metric", "ownerDecision", "customerImpact", "rollbackPath", "returnToNormalCriteria"]
}