ControlKit visionOS host app

This folder holds the visionOS host application (ControlKitRunnerApp.swift and Assets.xcassets) for the ControlKit-visionOS target in the shared XCRSControlKitRunner.xcodeproj.

visionOS is spatial: device.io.spatial.tap performs accessibility-driven activation through an XCUICoordinate tap, while raw device.io.tap, home, and orientation controls are intentionally unsupported. The JSON-RPC transport and server live in ../Shared and are compiled into the ControlKit-visionOS-UITests target.