Function supervise 

async fn supervise<S>(
    socket: &mut ClientSocket<S>,
    state: &Arc<TransportState>,
    peer: SocketAddr,
    settings: Receiver<Option<Arc<str>>>,
    sent_settings: Option<Arc<str>>,
    progress: &Progress,
) -> Result<()>
where
    S: Stream<Item = Result<Message, Error>> + Sink<Message, Error = Error> + Unpin + Send,

Run one connection under the wedge watchdog.

The keepalive cannot watch its own task: its beat is a branch in the connection’s own select!, so a connection parked in an await never reaches it. This watchdog sits outside the future, samples the connection’s completed writes (the stamp every frame flushes through), and ends it when none lands within the bound - then runs the same teardown a clean end does, because a reap that leaked the seat, the take or the browser viewer would trade a silent hang for a silent leak.