fix: backtest simulation uses ET timezone for trading window

The simulated timestamp was 10:00 UTC (6:00 AM ET) which is outside
the trading window. Changed to 11:00 AM ET so backtested decisions
actually pass the trading window check.

services/trading/backtest_replay.py

@@ -109,12 +109,14 @@ class BacktestReplay:
                 # Process recommendations for this day
                 for rec in day_recs:
                     # Set a timestamp within trading window for evaluation
+                    # Use 11:00 AM ET (within trading window) for simulation
+                    from services.trading.trading_window import ET
                     sim_time = datetime(
                         current_date.year,
                         current_date.month,
                         current_date.day,
-                        10, 0, 0,
-                        tzinfo=timezone.utc,
+                        11, 0, 0,
+                        tzinfo=ET,
                     )
 
                     decision = engine.evaluate_recommendation(