Design/continuity doc for the from-scratch SwiftUI iPhone+iPad app: Mac
build model, engineering decisions (min iOS 18, apple/ dir, XcodeGen+SPM,
@Observable, Swift 6 strict concurrency, SF Symbols, runtime-vector tiles),
the five determining optimizations, storage/audio/testing/crash choices,
region-aware payment seam with tracked App Store risks, and the full A-L
+ game-screen UX inventory. Delivery staged; several items tracked for
follow-up sessions.
Ilia Denisov