Remove Atomic in favor of Mutex#807
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`Atomic` was a DispatchQueue-based property wrapper that predates the `Mutex` primitive now available in the toolkit. It has no usages in the codebase and is not `Sendable`, making it incompatible with Swift 6 strict concurrency. `Mutex<Value>` is a direct replacement: it protects mutable state via `os_unfair_lock`, is `@unchecked Sendable`, and works on iOS 15+. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Atomicwas a DispatchQueue-based property wrapper that predates theMutexprimitive now available in the toolkit. It has no usages in the codebase and is notSendable, making it incompatible with Swift 6 strict concurrency.Mutex<Value>is a direct replacement: it protects mutable state viaos_unfair_lock, is@unchecked Sendable, and works on iOS 15+.