_MediaPlayer_AppIntents cross-import overlay

This cross-import overlay bridges MediaPlayer with App Intents, exposing media entities as Siri-actionable intents. It defines no types of its own; instead, it links the two frameworks so that media content from MediaPlayer can participate in the App Intents system. Use it to make a developer's media entities available to Siri and other intent-driven surfaces across iOS, macOS, tvOS, watchOS, and visionOS.