I built a local-first Apple Health recovery briefing that shows its math

I built recovery-trail, a small local-first Apple Health viewer that answers one specific training question: Should I push today, or should I pull back? The part I like most is what it does not use. There is no backend. There is no account. There is no upload. There is no LLM reading your health data and inventing a confident-sounding paragraph. It is just a browser app, a web worker, some trend math, and a rule trace. You drop in an Apple Health export.xml, it parses HRV, resting heart r...