hdiutil is deprecated in macOS 27 Golden Gate

Apple has deprecated hdiutil in macOS 27 Golden Gate, replacing it with diskutil image for disk image operations. While diskutil preserves most hdiutil functionality under different command names, it lacks several options including `-puppetstrings` for machine-readable progress output and various `create` subcommand flags. In testing, diskutil proved less user-friendly than hdiutil, failing silently on permission errors rather than prompting for authentication and lacking verbose error messaging.