Promise lifecycle

A later .then receives the wrong value, an error appears in a surprising place, or a batch fails differently than expected. Promise wrappers often do setup immediately, even before any `.then` callback.

Thinking the whole promise body is async.

Return or await the promise chain so values and failures move through the flow intentionally.

return doWork()
  .then((value) => nextStep(value))
  .catch(handleError);

The console lane proves the visible order: executor -> value. The active line and queues show why source order changed.

Write a focused unit test that asserts the resolved value or rejected path, then verify every branch returns or awaits its work.