macOS 13 image issues

[delan]

• macos13: display sleeps, making screenshots useless #16
• macos13: firmware boot menu waits for 45 seconds before continuing #18
• macos13: Terminal.app restores “sessions” on reboot in a weird way #19
• macos13: Terminal.app should be maximised so we can see more output #20
• macos13: mach bootstrap is busted with latest uv #30
• macos13: can’t run more than one concurrent instance per host?