fix(data): normalize symbols on the identity and reflection paths

resolve_instrument_identity and the reflection return lookup queried Yahoo with
the raw ticker, so broker/forex/commodity symbols (XAUUSD, BTCUSD, EURUSD)
failed identity or could mismatch the priced instrument even though the price
path already normalized them. Route both through normalize_symbol (#983, #984).

tradingagents/graph/trading_graph.py

@@ -232,12 +232,17 @@ class TradingAgentsGraph:
         actual_holding_days)`` or ``(None, None, None)`` if price data is
         unavailable (too recent, delisted, or network error).
         """
+        from tradingagents.dataflows.symbol_utils import normalize_symbol
+
         try:
             start = datetime.strptime(trade_date, "%Y-%m-%d")
             end = start + timedelta(days=holding_days + 7)  # buffer for weekends/holidays
             end_str = end.strftime("%Y-%m-%d")
 
-            stock = yf.Ticker(ticker).history(start=trade_date, end=end_str)
+            # Normalize so the realized-return lookup hits the same instrument
+            # the analysis priced (e.g. XAUUSD -> GC=F) (#984). The benchmark is
+            # already a canonical Yahoo symbol from ``_resolve_benchmark``.
+            stock = yf.Ticker(normalize_symbol(ticker)).history(start=trade_date, end=end_str)
             bench = yf.Ticker(benchmark).history(start=trade_date, end=end_str)
 
             if len(stock) < 2 or len(bench) < 2: