fix(adapters): set agy exit_key to /exit for clean graceful shutdown

.agents/skills/lib_py/agents/adapters/agy.py

@@ -17,7 +17,7 @@ class AgyAgentAdapter(BaseAgentAdapter):
 
     @property
     def exit_key(self) -> str:
-        return 'Exit'
+        return '/exit'
 
     @property
     def delegate_agent_key(self) -> str: