Update backtest_engine.py

backtest_engine.py

@@ -375,6 +375,7 @@ async def run_strategic_optimization_task():
             print(f"💉 Injecting DNA into {target_regime}...")
             st = hub.strategies[target_regime]
             st.model_weights['titan'] = best_config['w_titan']
+            st.model_weights['structure'] = best_config['w_struct']
             st.filters['l1_min_score'] = best_config['thresh']
             
             await hub._save_state_to_r2()