The prompt was wrong three times and the file now says so up front: the doctor-less appointment path was built and fully reverted, the getDoctor() blast radius was overstated, and the booking engine it asked to build already existed. Also records two tooling traps found on the way — phpstan runs at level 5 here so it never checks nullability, and migrations:diff missed the nullable change. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>