Dual native prefetch used to map an empty NotificationContent list to
synthetic JSON and still arm the chained notify alarm, which led hosts
such as TimeSafari to show marketing copy via show_default even when the
API had no rows.
Persist {"skipNotification":true} for an empty native result, skip
DualScheduleNotifyScheduler for that successful cycle while still
enqueueing dual fetch recovery, and teach DualScheduleHelper to return
no content for fresh skip payloads and for stale cache when
fallbackBehavior is skip. Add Robolectric tests for DualScheduleHelper
and the skip payload helper.
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