{
  "production_architecture": "TIERED_HYBRID_SPECIALIST",
  "tier1_fast_path": "RULE_REGISTRY_V6",
  "tier2_specialist_model": "dxa-0.7b-v0.7",
  "tier3_escalation_model": "dxa-1.5b-v0.5",
  "tier4_human_review": true,
  "routing_policy": {
    "student_canary_pct": 25.0,
    "escalation_threshold_confidence": 0.85,
    "escalation_threshold_novelty": 0.35
  },
  "rollback_protection": {
    "active": true,
    "fallback_model": "dxa-1.5b-v0.4",
    "max_consecutive_regressions": 0
  }
}