fix(bridge): 채널 중복 생성 race condition 수정 + AG- 접두사 + metadata 모니터링

main.py

@@ -4,21 +4,22 @@ Entry point that runs the brain watcher and Discord bot together.
 """
 
 import asyncio
+import io
 import logging
-import signal
 import sys
 
 from config import Config
 from watcher import BrainWatcher
 from bot import GravityBot
 
-# Logging setup
+# Logging setup (UTF-8 forced for Windows cp949 compatibility)
+_utf8_stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8", errors="replace")
 logging.basicConfig(
     level=logging.INFO,
     format="%(asctime)s [%(name)s] %(levelname)s: %(message)s",
     datefmt="%Y-%m-%d %H:%M:%S",
     handlers=[
-        logging.StreamHandler(sys.stdout),
+        logging.StreamHandler(_utf8_stdout),
         logging.FileHandler("gravity_control.log", encoding="utf-8"),
     ],
 )