iOS simulator browser

Mirror with npx --yes serve-sim@latest <udid> (see --help) and open the URL it prints. Run it in a long-lived terminal with a trap that runs serve-sim --kill <udid>. Never run an unscoped --kill. Verify a real frame renders before reporting success.

Previews from a Swift package: node <skill-root>/scripts/swiftui-preview-browser.mjs /abs/Package.swift --package-target <target> --device <udid> (see --help, including --preview-filter). It builds a disposable host outside the source tree and hot-swaps on edits. Never edit the user's .xcodeproj, .xcworkspace, Package.swift, or schemes for preview support.

Proof: a browser screenshot of the simulator frame. For hot reload, also the launcher's hot reloaded package preview output and the changed frame.