ActivityKit

ActivityKit owns real-time, glanceable Live Activities displayed on the Lock Screen and Dynamic Island. Ordinary timeline widgets belong in widgetkit, and generic APNs setup belongs in push-notifications; ActivityKit owns the Live Activity lifecycle and payload contract. aps.content-state must decode into the exact ActivityAttributes.ContentState shape, including any coordinated custom date/range encoding. Modern ActivityContent lifecycle examples require iOS 16.2+ unless noted.

See references/activitykit-patterns.md for complete code patterns including push payload formats, concurrent activities, state observation, and testing.

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