pub async fn shutdown_shared_socket_service()Expand description
Signal the global shared socket listener to stop, if it was ever started.
Must be called during graceful shutdown BEFORE the pipeline runtime (which hosts
the accept loop) is torn down, so the loop breaks on its watch signal instead of
spinning on accept() errors from a shutting-down tokio context. Uses
SHARED_SOCKET.get() (not get_or_init) so it is a true no-op when the service was
never initialized (i.e. no plugin ever executed).