Prevent duplicate Twitch session prompts

app/main.py

@@ -92,20 +92,7 @@ async def get_or_create_twitch_session(channel_name: str) -> str:
     if not orchestrator:
         raise RuntimeError("Orchestrator not initialized")
 
-    normalized_channel = channel_name.lower()
-    matching_sessions = [
-        (session_id, session)
-        for session_id, session in orchestrator.active_sessions.items()
-        if session.get("channel_name", "").lower() == normalized_channel
-    ]
-    if matching_sessions:
-        session_id, _ = max(
-            matching_sessions,
-            key=lambda item: item[1].get("started_at", datetime.min),
-        )
-        return session_id
-
-    return await orchestrator.start_session(channel_name)
+    return await orchestrator.ensure_single_active_session_for_channel(channel_name)
 
 
 async def handle_twitch_chat_message(message: TwitchChatMessage) -> None:
@@ -159,8 +146,8 @@ async def startup_event():
             loop_interval_seconds=settings.AGENT_LOOP_INTERVAL_SECONDS
         )
         await orchestrator.restore_active_sessions()
-        agent_loop_task = asyncio.create_task(agent_loop())
         await start_twitch_chat()
+        agent_loop_task = asyncio.create_task(agent_loop())
         logger.info("Application started successfully")
     except Exception as e:
         logger.error(f"Failed to start application: {e}")