Handle keyboard interrupt (ctrl-c.)

ra_aid/__main__.py

@@ -247,6 +247,7 @@ def run_research_subtasks(base_task: str, config: dict, model, expert_enabled: b
 
 def main():
     """Main entry point for the ra-aid command line tool."""
+    try:
         args = parse_arguments()
         expert_enabled, expert_missing = validate_environment(args)  # Will exit if main env vars missing
         
@@ -346,5 +347,9 @@ def main():
                 expert_enabled=expert_enabled
             )
 
+    except KeyboardInterrupt:
+        console.print("\n[red]Operation cancelled by user[/red]")
+        sys.exit(1)
+
 if __name__ == "__main__":
     main()