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

I built a terminal app that paces slow breathing at 6 breaths per minute for vagal tone training. It’s a single Python file, stdlib only, no dependencies — just run breathe and follow the bar.I’m a cardiology patient (HFrEF). Slow breathing at resonance frequency is one of the few non-pharmacological interventions shown to improve cardiac vagal tone and baroreflex sensitivity (Bernardi et al., Circulation 2002; Lancet 1998). I wanted a frictionless daily habit tool — no app store, no account, no…

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