Fix Windows encoding issues: UTF-8 log file and ASCII arrow in logging

main.py

@@ -227,7 +227,7 @@ def main():
     logging.basicConfig(
         level=logging.INFO,
         format="%(asctime)s %(name)s %(levelname)s %(message)s",
-        handlers=[logging.FileHandler("data/soci.log", mode="a")],
+        handlers=[logging.FileHandler("data/soci.log", mode="a", encoding="utf-8")],
     )
 
     asyncio.run(run_simulation(

src/soci/actions/conversation.py

@@ -133,7 +133,7 @@ async def initiate_conversation(
     )
     conv.add_turn(turn)
 
-    logger.info(f"Conversation started: {initiator.name} → {target.name}: \"{message}\"")
+    logger.info(f"Conversation started: {initiator.name} -> {target.name}: \"{message}\"")
     return conv