Tests as verification

Anything with rules, a handout sorter, an exit-ticket formatter, a pacing table that reads dates off the district calendar. Can carry its own tests: 'given these 3 inputs, the output must be exactly this.' Have Claude write the checks alongside the work, and every future change gets caught the moment it breaks something. A pacing table that is off because a break was typed from memory is a unit that ends on the wrong week with your name on it.