Quick reference for SwiftUI's layout containers: stacks, grids, outlines, and the iOS 18+ custom container API that lets you build List replacements. This is where you go when VStack isn't doing what you expect or you need a grid that actually works on iPad. Part of the larger axiom-swiftui suite, which routes you here whenever you're wrangling layout primitives. The main skill file has a decision tree that sends container questions this way, and there's apparently a whole section (Part 7) on building your own container views if the stock ones don't cut it. Straightforward API documentation, not architectural guidance.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-swiftui-containers-ref