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Bernardo asked whether TuringMachine (NixOS 25.11) could adopt Nomarchy without a reinstall, keeping all files. It can — it's a config switch that reuses the existing hardware-configuration.nix, not a reformat. Adds docs/MIGRATION.md: a generic "existing NixOS → Nomarchy" walkthrough with TuringMachine as the worked example — candidacy checklist, the two data-safety rules (never bump system.stateVersion; /home untouched), a reversible Phase 0→4 (btrfs snapshot → build-only gate → nixos-rebuild test → reconcile → cutover) and a triple rollback net. Bakes his decisions: Nomarchy PPD (drop all ryzenadj), no Secure Boot (drop lanzaboote), full cutover. Flake/system/home examples verified against lib.nix mkFlake + templates/downstream, not guessed. Also files a PROPOSED note: home.stateVersion should be mkDefault so migrating users don't need mkForce. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>