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Add the durable-states Milestone primitive and a milestone card to the daily digest. A milestone marks a state REACHED, never days maintained: a metric settled back inside its own range, a run of weeks in range, or a fresh personal best. It is deliberately not a streak — the type carries a reached-date and no running counter, so nothing here can be tuned into a flame, and a lapse is invisible rather than mourned. The primitive is a thin wrapper over engines that already exist: the pure detectStreak band engine (return-to-range + sustained-in-range) and the PersonalRecord detection output (new bests). Reached-once needs no new storage — a milestone's reached-date is a stable fact, so it surfaces only on the day it was reached and never resurfaces the next day. The digest emits one calm success card per day when a milestone is freshly reached, below an overdue dose and above ambient items, with a single action into the metric's insight. Module- and data-gated: a disabled insights account or a day with nothing reached shows nothing. Copy carries no streak, loss, or failure vocabulary, in all six locales.