feribsd/uss — reverse-engineered prompt

Build me a simple universal setup script for Void Linux in POSIX sh. I want to boot from a live ISO, run one script, and have it install and configure my system in an opinionated way instead of making me pick every little option. It should set up the basics I need, including Limine, doas, networking with iwd, my window manager setup, and the usual packages.

Also add a second mode that works on an already installed system and just deploys my normal desktop setup, including the packages for my window manager and NVIDIA drivers. Keep it personal and opinionated, not a generic installer with tons of choices.

Make the script readable, with clear prompts before anything destructive like disk formatting, and make it easy for me to edit package lists or settings later. Include a short README that explains what the script does, how to run installer mode, and how to run deploy mode.