LabCraft Profiles and Generations: a new hands-on Nix Part on generations and rollback

I’ve published Profiles and Generations, the next free Part of LabCraft’s Nix course. It covers the operational layer on top of the store model: an install publishes a numbered, immutable generation and moves a symlink, so rollback is a symlink flip to an untouched snapshot — instant, offline, nothing re-downloaded — and wiping a profile’s history drops the generation links without freeing disk until a collection runs. The lab has learners predict what each change does before Nix shows them, on ...