Boot recovery was skipping reschedule when it found an "existing" PendingIntent.
AlarmManager alarms are not guaranteed to persist across reboot; on devices that
clear them, the skip caused the next notification (initial or rollover) to never
fire until the app was opened. Pass skipPendingIntentIdempotence = true for all
BOOT_RECOVERY call sites (BootReceiver, ReactivationManager.rescheduleAlarmForBoot)
so the alarm is always re-registered after reboot. Setting the same PendingIntent
again replaces any existing alarm, so no duplicate alarms.
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