fix: close MCP stdio transports from agent task

nanobot/cli/commands.py

@@ -1105,16 +1105,23 @@ def _run_gateway(
             console.print(f"[yellow]Could not open browser ({e}); visit {open_browser_url}[/yellow]")
 
     async def run():
+        tasks: list[asyncio.Task] = []
         try:
             await cron.start()
             tasks = [
-                agent.run(),
-                channels.start_all(),
+                asyncio.create_task(agent.run(), name="nanobot-agent-loop"),
+                asyncio.create_task(channels.start_all(), name="nanobot-channels"),
             ]
             if health_server_enabled:
-                tasks.append(_health_server(config.gateway.host, port))
+                tasks.append(asyncio.create_task(
+                    _health_server(config.gateway.host, port),
+                    name="nanobot-health-server",
+                ))
             if open_browser_url:
-                tasks.append(_open_browser_when_ready())
+                tasks.append(asyncio.create_task(
+                    _open_browser_when_ready(),
+                    name="nanobot-open-browser",
+                ))
             await asyncio.gather(*tasks)
         except KeyboardInterrupt:
             console.print("\nShutting down...")
@@ -1124,9 +1131,13 @@ def _run_gateway(
             console.print("\n[red]Error: Gateway crashed unexpectedly[/red]")
             console.print(traceback.format_exc())
         finally:
-            await agent.close_mcp()
             cron.stop()
             agent.stop()
+            for task in tasks:
+                if not task.done():
+                    task.cancel()
+            if tasks:
+                await asyncio.gather(*tasks, return_exceptions=True)
             await channels.stop_all()
             # Flush all cached sessions to durable storage before exit.
             # This prevents data loss on filesystems with write-back