One ordering for all of it. The pill, the notification and the ring used to be
three places that each decided which timer mattered most; TimerReadings is now
the single answer, and the pill's own test passing unmodified is the proof the
extraction changed none of M4's behaviour.
Expiry is a pure function of state, which is what makes the arbitration with a
ringing alarm symmetric: the alarm wins the audio, and the timer's ring is
deferred rather than lost. Durations stay anchored to elapsed realtime, so
moving the system clock cannot move an expiry.
makiolaj
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