fix(mcp): clean up connections on exit in interactive and gateway modes

nanobot/cli/commands.py

@@ -387,6 +387,8 @@ def gateway(
             )
         except KeyboardInterrupt:
             console.print("\nShutting down...")
+        finally:
+            await agent._close_mcp()
             heartbeat.stop()
             cron.stop()
             agent.stop()
@@ -465,6 +467,7 @@ def agent(
         signal.signal(signal.SIGINT, _exit_on_sigint)
         
         async def run_interactive():
+            try:
                 while True:
                     try:
                         _flush_pending_tty_input()
@@ -489,6 +492,8 @@ def agent(
                         _restore_terminal()
                         console.print("\nGoodbye!")
                         break
+            finally:
+                await agent_loop._close_mcp()
         
         asyncio.run(run_interactive())