How do you enable Approachable Concurrency in Swift Packages?

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Swift 6.2 introduces Approachable Concurrency, which assumes code runs on the main thread by default and only moves to background threads when necessary. New Xcode 26 projects enable this automatically, while existing projects require build setting changes. Swift Packages need swift-tools-version 6.2 and specific swiftSettings configurations including defaultIsolation(MainActor.self) and upcoming feature flags. The feature is still in beta with some known issues around protocols like CodingKey that expect nonisolated behavior.