Migration Patterns Comprehensive guides for migrating between Apple framework generations. Each guide covers the full before/after mapping, coexistence strategies, and common pitfalls. When This Skill Activates - User asks how to migrate from CoreData to SwiftData - User is moving UIKit code to SwiftUI (or embedding one in the other) - User needs to update from ObservableObject/Combine to @Observable/AsyncSequence - User is converting XCTest tests to Swift Testing - User asks about coexistence strategies (running old and new frameworks side by side) - User wants to know whether a migration is…