Axiom Swift Concurrency

You need this when working with Swift's async/await, actors, Sendable conformance, or any Swift 6 concurrency errors. It splits cleanly from axiom-swift, which handles modern idioms, ownership, and Transferable but explicitly punts concurrency details here. The parent skill's conflict resolution is clear: if you're debugging actor isolation or Sendable warnings, use this, not swift-modern.md. Based on the split, expect coverage of structured concurrency patterns, MainActor usage, task groups, and the practical differences between Swift 5 concurrency and Swift 6's stricter checking. This is the targeted skill for concurrency problems, not a general Swift reference.