Thread the auto_missed flag through the cadence timeline so a forgotten
dose pairs to a missed slot (against the rate) rather than a neutral skip;
a deliberate user skip stays excluded. This unifies the skip semantics
across every compliance surface: user skip = excluded, forgotten = missed.
Add a per-dose grace/miss window model the card will render:
deriveDoseStatus derives on_time_window / overdue / missed / taken_on_time
/ taken_late / skipped / upcoming from the target instant, cadence family,
and now. Daily/intraday uses minute-scale windows (on-time +/-60min,
overdue to +240min, capped at the next dose); weekly/rolling uses the
clinical 4-day rule (on-time +/-1 day, overdue to +4 days). Defaults are
centralised named constants for later per-medication configurability.
Surface taken / expected / missed counts on each compliance-display row so
the card can show the trustworthy 'taken / expected . rate%' triple, and
pin a single now through the per-medication compliance route so the two
windows can't straddle a day boundary on a slow request.