Root-cause fix for the unstoppable-alarm incident (alarm rang 15 minutes,
only uninstall silenced it) plus systematic hardening of every stop path.
Native (Kotlin):
- Verified stop: stopActiveAlarm now derives its result from the real
post-teardown state (companion instance + synchronous stopEverything +
activeRingingId check) instead of reporting unconditional success.
- Atomic teardown: every stop path (stop action, notification button,
snooze, missed, onDestroy, startForeground failure) funnels through one
stopEverything() covering audio, wakelock, notification, foreground
state and firing-record cleanup; player.release() guarded.
- Bounded ringing: 10-minute auto-silence armed via AlarmManager fires a
FIRED->MISSED transition with a localized missed-alarm notification;
repeating alarms keep their native rearm, deleted alarms never produce
ghost MISSED notifications.
- Durable firing record with onStartCommand re-validation (resurrection
guard) and boot-time stale cleanup; firing records cleared on every
refuse/mismatch/cancel path.
- New notification-only dismissal channel (dismissAlarmNotificationOnly)
so UI-level dedup can never kill a live ring's audio.
Flutter (Dart):
- Stop/disable/edit/delete of a ringing alarm always attempt to silence
it; on native-query failure the stop falls back toward silence via the
id-scoped legacy stop.
- Verified-stop results surface failures: the ringing screen keeps
dismiss-by-design on success, but on a verified failure it stays up
with a persistent force-stop banner (guarded against double-dismiss)
and auto-dismisses if the ring ends externally (missed/notification).
- Missed events sync alarm bookkeeping without opening the ringing UI.
- 4 new l10n keys translated across all 13 locales (ARB guard green).
550 tests green, analyzer clean. Reviewed in 3 adversarial 4-lens rounds
(2 deterministic + 1 refuter-corroborated critical fixed); formal
gentle-ai receipt waived by maintainer authorization (correction scope
legitimately exceeded the frozen genesis paths). On-device QA checklist
in openspec/changes/alarm-system-overhaul/tasks.md pending before
archive.
