fix: address code review feedback

- Preserve and restore self.ticker and self.curr_state in
  propagate_portfolio() using try/finally to prevent side effects
- Use pathlib.Path for log file construction in _log_portfolio()
- Move traceback import to module level

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tradingagents/graph/portfolio_analysis.py

@@ -1,6 +1,7 @@
 # TradingAgents/graph/portfolio_analysis.py
 
 import json
+import traceback
 from pathlib import Path
 from typing import Any, Callable, Dict, List, Tuple
 
@@ -88,7 +89,6 @@ class PortfolioAnalyzer:
                     "final_trade_decision": final_state["final_trade_decision"],
                 }
             except Exception as e:
-                import traceback
                 if debug:
                     print(f"Error analyzing {ticker}: {e}")
                 individual_results[ticker] = {
@@ -177,9 +177,6 @@ class PortfolioAnalyzer:
             "portfolio_summary": portfolio_summary,
         }
 
-        with open(
-            f"eval_results/portfolio/portfolio_analysis_{trade_date}.json",
-            "w",
-            encoding="utf-8",
-        ) as f:
+        log_file = directory / f"portfolio_analysis_{trade_date}.json"
+        with log_file.open("w", encoding="utf-8") as f:
             json.dump(log_data, f, indent=4)

tradingagents/graph/trading_graph.py

@@ -278,13 +278,18 @@ class TradingAgentsGraph:
 
         Delegates to PortfolioAnalyzer.analyze — see that class for full details.
 
-        Note: Each call to propagate() overwrites self.ticker and self.curr_state,
-        so after this method returns, both reflect only the last ticker analyzed.
-        Calling reflect_and_remember() afterward will only apply to that last ticker.
+        This method preserves the instance's ticker and curr_state attributes,
+        restoring them after the portfolio analysis is complete.
         """
-        return self.portfolio_analyzer.analyze(
-            tickers, trade_date, self.propagate, debug=self.debug
-        )
+        original_ticker = self.ticker
+        original_curr_state = self.curr_state
+        try:
+            return self.portfolio_analyzer.analyze(
+                tickers, trade_date, self.propagate, debug=self.debug
+            )
+        finally:
+            self.ticker = original_ticker
+            self.curr_state = original_curr_state
 
     def reflect_and_remember(self, returns_losses):
         """Reflect on decisions and update memory based on returns."""