Breathe CLI – Paced resonance breathing in the macOS terminal

Breathe CLI is a zero-dependency Python terminal app that paces slow, resonance-frequency breathing at 6 breaths per minute directly in the macOS terminal. Built by a cardiology patient with HFrEF for vagal tone training, it offers a simple, distraction-free breathing guide—just run `breathe` and follow the moving bar. It’s interesting as a minimalist, medically-informed productivity tool that turns the command line into a therapeutic device.