fix: 채널 중복 생성 근본 수정 - 글로벌 락 + 이름 기반 검색 + API 새로고침

bot.py

@@ -125,7 +125,7 @@ class GravityBot(commands.Bot):
         self.session_channels: dict[str, discord.TextChannel] = {}
         self.session_status_messages: dict[str, int] = {}
         self.session_names: dict[str, str] = {}
-        self._channel_locks: dict[str, asyncio.Lock] = {}
+        self._channel_create_lock = asyncio.Lock()  # SINGLE global lock
         self.bridge = BridgeProtocol()
         self.session_category: discord.CategoryChannel | None = None
         self.guild: discord.Guild | None = None
@@ -156,23 +156,20 @@ class GravityBot(commands.Bot):
                 logger.error("No permission to create category!")
                 return
 
-        # ONLY reconnect to existing Discord channels (NO new channel creation)
+        # ONLY reconnect to existing Discord channels (NO new creation)
         await self._reconnect_existing_channels()
 
     async def _reconnect_existing_channels(self):
-        """Scan existing Discord channels and map them to conversation IDs.
-        Does NOT create any new channels."""
+        """Scan existing Discord channels and map them to conversation IDs."""
         if not self.session_category:
             return
 
         count = 0
         for ch in self.session_category.text_channels:
             if ch.topic and "Antigravity Session:" in ch.topic:
-                # Extract conversation ID from topic
                 conv_id = ch.topic.replace("Antigravity Session:", "").strip()
                 if conv_id:
                     self.session_channels[conv_id] = ch
-                    # Recover last task embed
                     await self._recover_task_message(ch, conv_id)
                     count += 1
 
@@ -181,7 +178,6 @@ class GravityBot(commands.Bot):
     async def _recover_task_message(
         self, channel: discord.TextChannel, conversation_id: str
     ):
-        """Find last task embed in channel to reuse for editing."""
         if conversation_id in self.session_status_messages:
             return
         try:
@@ -199,43 +195,37 @@ class GravityBot(commands.Bot):
     async def _ensure_channel(
         self, conversation_id: str, project_name: str
     ) -> discord.TextChannel:
-        """Get or create a channel (thread-safe, single creation per session)."""
+        """Get or create a channel. Uses GLOBAL lock and NAME-based lookup."""
+        # Fast path: already mapped
         if conversation_id in self.session_channels:
-            ch = self.session_channels[conversation_id]
-            # Rename back from "closed-" if needed
-            expected = f"{Config.CHANNEL_PREFIX}-{project_name}".lower()
-            if ch.name.startswith("closed-") and ch.name != expected:
-                try:
-                    await ch.edit(name=f"{Config.CHANNEL_PREFIX}-{project_name}")
-                except discord.errors.Forbidden:
-                    pass
-            return ch
+            return self.session_channels[conversation_id]
 
-        # Lock per conversation to prevent duplicates
-        if conversation_id not in self._channel_locks:
-            self._channel_locks[conversation_id] = asyncio.Lock()
-
-        async with self._channel_locks[conversation_id]:
-            # Double-check
+        async with self._channel_create_lock:
+            # Double-check after lock
             if conversation_id in self.session_channels:
                 return self.session_channels[conversation_id]
 
             channel_name = f"{Config.CHANNEL_PREFIX}-{project_name}"
+            target_name = channel_name.lower().replace(" ", "-")
 
-            # Check if channel exists but wasn't mapped yet
+            # Fetch FRESH channel list from Discord API (not cached)
             if self.session_category:
-                for ch in self.session_category.text_channels:
-                    if ch.topic and conversation_id in ch.topic:
+                category = await self.guild.fetch_channel(self.session_category.id)
+                for ch in category.text_channels:
+                    # Match by NAME (handles different conv IDs → same project)
+                    if ch.name == target_name or (ch.topic and conversation_id in ch.topic):
                         self.session_channels[conversation_id] = ch
                         self.session_names[conversation_id] = project_name
+                        # Rename from closed- if needed
                         if ch.name.startswith("closed-"):
                             try:
                                 await ch.edit(name=channel_name)
                             except discord.errors.Forbidden:
                                 pass
+                        logger.info(f"Reusing existing channel #{ch.name}")
                         return ch
 
-            # Create new channel
+            # Create new channel (only if truly no match found)
             try:
                 channel = await self.guild.create_text_channel(
                     name=channel_name,