Show HN: Breathe CLI – Paced resonance breathing in the macOS terminal

A terminal-based breathing tool called Breathe CLI was developed for macOS to facilitate paced resonance breathing at 6 breaths per minute, targeting improved cardiac vagal tone. The creator, a cardiology patient with HFrEF, designed it with clinical guidelines to avoid risks like breath retention and rapid breathing. It uses macOS's afplay for audio cues and is distributed via pip or Homebrew with an MIT license.