Walk the event loop before changing async code

Async trace The console should show loading, then data, then done, but your timer and promise logs keep swapping places. Changing delays without tracing queues creates accidental fixes that break again under load. Execution model Stack first, promise jobs next, timer tasks later Use a queue label before you reach for another timeout. Guess Add setTimeout(..., 0) and hope order improves. You predict order before changing behavior. Do not debug async order by feel. Label the queue that owns each callback. 01 Sync logs 02 Promise job 03 Fresh trace First pass Line labels

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