Update app.py

app.py

@@ -49,8 +49,13 @@ except ImportError:
 # ----------------------------------------------------------------------
 # Infrastructure simulator and engines
 # ----------------------------------------------------------------------
-infra_sim = AzureInfrastructureSimulator(policy=policy_engine)
+# Define policy_engine first
 policy_engine = PolicyEngine()  # loads default policies
+
+# Now create simulator, passing the policy_engine
+infra_sim = AzureInfrastructureSimulator(policy=policy_engine)
+
+# Risk engine (does not depend on policy_engine)
 risk_engine = RiskEngine(hmc_model_path="hmc_model.json", use_hyperpriors=True)
 
 # ----------------------------------------------------------------------