fix: set process-level UTF-8 default for cross-platform consistency

cli/main.py

@@ -462,7 +462,7 @@ def update_display(layout, spinner_text=None, stats_handler=None, start_time=Non
 def get_user_selections():
     """Get all user selections before starting the analysis display."""
     # Display ASCII art welcome message
-    with open(Path(__file__).parent / "static" / "welcome.txt", "r", encoding="utf-8") as f:
+    with open(Path(__file__).parent / "static" / "welcome.txt", "r") as f:
         welcome_ascii = f.read()
 
     # Create welcome box content
@@ -968,7 +968,7 @@ def run_analysis():
             func(*args, **kwargs)
             timestamp, message_type, content = obj.messages[-1]
             content = content.replace("\n", " ")  # Replace newlines with spaces
-            with open(log_file, "a", encoding="utf-8") as f:
+            with open(log_file, "a") as f:
                 f.write(f"{timestamp} [{message_type}] {content}\n")
         return wrapper
     
@@ -979,7 +979,7 @@ def run_analysis():
             func(*args, **kwargs)
             timestamp, tool_name, args = obj.tool_calls[-1]
             args_str = ", ".join(f"{k}={v}" for k, v in args.items())
-            with open(log_file, "a", encoding="utf-8") as f:
+            with open(log_file, "a") as f:
                 f.write(f"{timestamp} [Tool Call] {tool_name}({args_str})\n")
         return wrapper
 
@@ -993,7 +993,7 @@ def run_analysis():
                 if content:
                     file_name = f"{section_name}.md"
                     text = "\n".join(str(item) for item in content) if isinstance(content, list) else content
-                    with open(report_dir / file_name, "w", encoding="utf-8") as f:
+                    with open(report_dir / file_name, "w") as f:
                         f.write(text)
         return wrapper
 

tradingagents/__init__.py

@@ -0,0 +1,2 @@
+import os
+os.environ.setdefault("PYTHONUTF8", "1")