Agent Skills: shipping-swift-apps

Ships native Swift/SwiftUI apps to TestFlight and the App Store with fastlane and xcodebuild — one App Store Connect API key for both, fastlane lanes scoped to metadata/pricing/subscriptions, headless `xcodebuild archive` + `-exportArchive destination=upload`, build numbers read from App Store Connect instead of guessed, closed pre-release trains, `SKIP_INSTALL` for bundled helper apps, and per-destination archives for multiplatform targets. Use when setting up fastlane for an Xcode project, uploading a build to TestFlight from a script or CI, or debugging "Invalid Pre-Release Train", "expected one {} but found app-store-connect", "Unknown Distribution Error", or a duplicate-build-number rejection.