Function spawn_named 

pub fn spawn_named<T, F>(name: &str, f: F) -> Option<JoinHandle<T>>
where
    F: FnOnce() -> T + Send + 'static,
    T: Send + 'static,

Spawn f on a named thread. On failure (e.g. PID/thread limit), log a warning and return None so callers can fall back to inline work or skip the feature.