Fix live session filter overriding XAU strategy signals

The general session filter ran after analyze_from_dataframes() and
wiped out XAU oversold bounce signals at most hours. Now skips the
session filter when the XAU strategy has already fired — the strategy
has its own backtested hour filter.

signal_aggregator.py

@@ -139,6 +139,12 @@ class SignalAggregator:
             self._apply_regime_filter_live(report, dfs)
 
         if bt.session_filter:
+            xau_active = (
+                report.display_name == "XAU/USD"
+                and self.config.xau_strategy.enabled
+                and any("XAU STRATEGY" in r for r in report.bullish_reasons)
+            )
+            if not xau_active:
                 self._apply_session_filter_live(report)
 
         return report