Refresh model metadata (module dep + KPIs 2026-08-13)

model/model_metadata.json

@@ -1,6 +1,7 @@
 {
   "model_name": "isolation_forest_quality",
   "model_type": "IsolationForest (NumPy implementation)",
+  "implementation_module": "isolation_forest.py (in model/ dir)",
   "version": "1.0.0",
   "training_date": "2026-08-13",
   "operational_date": "2026-08-13",
@@ -34,5 +35,5 @@
     "anomaly_score": "Isolation Forest anomaly score in [0.5, 1.0]; higher = more anomalous",
     "high_risk": "1 = high-quality-risk shipment flagged for review, 0 = normal"
   },
-  "update_strategy": "Retrain daily on each day's new data snapshot; threshold re-estimated at 5th percentile contamination."
+  "update_strategy": "Retrain daily on each day's new data snapshot; threshold re-estimated at 5% contamination."
 }