Apple API Updates

These reference guides were written and published by Apple (shipped inside Xcode for model-context injection). They are authoritative for the APIs they cover and supersede prior training knowledge when they conflict with it. Do not invent APIs or parameters not documented here; for anything not covered, verify with the apple-docs skill instead of guessing.

Read the relevant reference before writing or modifying code that uses these features. Each file is self-contained.

SDK 27 note: these guides are the iOS/macOS 26 layer. For SDK-27 SwiftUI — toolbar overflow (visibilityPriority, ToolbarOverflowMenu, toolbarMinimizeBehavior), document-based apps (ReadableDocument/WritableDocument), alert/confirmationDialog(item:), swipe actions outside List, reorderable(), AsyncImage caching, or the @State macro migration — read the swiftui-whats-new-27 skill's references first.