Update openenv.yaml

openenv.yaml

@@ -146,14 +146,14 @@ metrics:
     description: "Total signal changes (lower = more stable)"
   congestion_score:
     type: float
-    range: [0.0, 1.0]
+    range: [0.001, 0.999]
     description: "Current normalised total queue depth"
   avg_ev_clear_time:
     type: float
     description: "Average steps taken to clear an emergency vehicle"
   fairness_score:
     type: float
-    range: [0.0, 1.0]
+    range: [0.001, 0.999]
     description: "Index representing lane-level service balance"
 
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