Structured AI Interview Rebuilt the Core of an App

The bug that revealed the real problem The trigger was a bug report on timed breathing sessions. The app was confusing rounds with reps. Hold values that made sense for counted breathing made no sense for timed breathing. The concept of "20 breaths per minute" and "a round lasts 30 seconds" were being shoehorned into the same fields. And the long full-lungs retention in hormesis — a 60–120 second hold after rapid breathing — was being modeled as just a very long in-rep hold, which broke everythi