test: bunch of tests

Written with AI, still need to check them

ref: N25B-449

src/control_backend/main.py

@@ -172,6 +172,8 @@ async def lifespan(app: FastAPI):
 
     await endpoints_pub_socket.send_multipart([PROGRAM_STATUS, ProgramStatus.STOPPING.value])
     # Additional shutdown logic goes here
+    for agent in agents:
+        await agent.stop()
 
     logger.info("Application shutdown complete.")