Debounce with Cancel and Flush

Write a trailing-edge debounce whose returned function also has two controls:

debounceWithControls(fn, wait)  // trailing-edge debounce
  .cancel()                     // drop the pending call
  .flush()                      // run the pending call now (no-op if nothing is pending)

The grader replays timed call scripts on a virtual clock — setTimeout, clearTimeout, and Date.now are stubbed — so build on those, not on performance.now or promises. Each case's input is the wait and a script of [ms, action, ...args] steps; the expected output lists every fire as {at, args}.

Rules

• The wrapper fires once per burst, wait ms after the last call, with that call's arguments.
• flush runs the pending call immediately and clears the timer; cancel drops it. Later calls start a fresh cycle either way.
• Return a real function, not an arrow, so a caller's this is forwarded.