- iOS: Implement rolling window counting using UNUserNotificationCenter
- iOS: Enable TTL validation in scheduler before arming notifications
- iOS: Implement SQLite persistence for save/delete/clear operations
- Android: Implement rolling window counting using storage as source of truth
- Android: Add dateBoundsMillis helper for date range calculations
Removes all TODO stubs affecting capacity/rate-limiting correctness.
Fixes runtime behavior to match test expectations and optimizer logic.
Refs: Deep fixes directive for bottom-of-tree gaps
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