CLAUDE.md for Swift and iOS: 13 Rules That Stop AI From Writing Unsafe, Non-Idiomatic Apple Code

Ask Claude Code to "add a screen that loads a user profile and shows their orders" and the output compiles. It also strong-captures self in three closures, blocks the main thread on a network call, mutates @State from a background actor, and leaks a coordinator. Nothing crashes in the simulator. Everything crashes in TestFlight. Swift is hostile to AI defaults: ARC, the SwiftUI lifecycle, Combine, structured concurrency, and a decade of UIKit history coexist in the same target. Half the model's