Sauna-vs-gym-cost 0.1.0

A home sauna is priced by sticker and judged by vibe; this terminal calculator turns the purchase into a dollars-per-session number instead. The gear cost amortizes over the sessions a habit actually produces, an electricity line most buyers skip rides on top, and the tool prints the visit count where owning finally beats paying per visit elsewhere. The method keeps the units honest: kilowatt-hours per session times a bill-grade electric rate, weekly habit times 52 as the denominator. A $2,500 unit used 4 times a week at 17 cents a kilowatt-hour lands at $4.34 a session by month 36 and breaks even against a $22 per-visit alternative after 115 visits. When the alternative costs less than the electricity alone, the gap is negative and the tool says so instead of printing a number that looks like a win. --compare runs two usage habits head to head; --json emits machine output. Python 3.8+, one file, standard library only, no network calls, MIT licensed.

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