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end(_:dismissalPolicy:) requires iOS 16.2 but LiveActivityManager.end only gated to 16.1 (Live Activities' own minimum) - branch on #available with the deprecated overload as fallback. Separately, auditing all countdown widgets per user request found the "Event Countdown (Bars)" widget family had its own independent start-date resolution that never considered the task's real creation date at all - EventEntity now carries createdAt and resolveSpan prefers it the same way KC-65 already does for the dot-grid widget. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>