Creates and maintains a macOS menu bar app whose Xcode project is generated by Tuist: a SwiftUI MenuBarExtra scene, no Dock icon, manifests in Swift, and a terminal loop that rebuilds and relaunches the app. Covers choosing between a menu and a panel, where fetching and state belong, Quit and Settings items, launch at login, dependencies and tests. Use when the user says "make a menu bar app", "status bar utility for macOS", "set this up with Tuist", "hide the Dock icon", "LSUIElement", "MenuBarExtra", "rebuild and relaunch from the terminal" or "add launch at login".
