Swift 6 Concurrency Guide

Purpose: Practical path from single-threaded code to safe concurrency Swift Version: Swift 6.0+, Swift 6.2+ for @concurrent iOS Version: iOS 17+ (iOS 18.2+ for @concurrent) Xcode: Xcode 16+ (Xcode 16.2+ for @concurrent) Context: WWDC 2025-268 "Embracing Swift concurrency" - approachable path to data-race safety

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