Bernardo Magri
e324876eb7
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/var/lib survives a migration untouched, and a stray pre-Nomarchy Linger=yes marker shaped the QA box's session behavior for six months with nothing in the flake to show for it. Ship the class as guards: - nomarchy-doctor: new machine-state-drift check after the flake-checkout check — loginctl show-user -p Linger; "yes" warns (nothing is broken — it is drift) and prints the disable-linger fix; unknown-to-logind skips. - docs/MIGRATION.md § Post-migration cleanup: "/var/lib machine state survives migration" — the worked example and the general suspicion rule. - checks.doctor: linger sub-case — warn fires under enable-linger, exit stays 0, warning clears after disable-linger. Deliberately NOT hardening the session wiring against the portal-gtk restart race linger enabled: a clean install cannot reach that state. The Waybar exec-once loose thread survives as BACKLOG #149. Verification: V2 — shellcheck clean, nix flake check --no-build green, nix build .#checks.x86_64-linux.doctor green (both branches exercised). Implementation by a Sonnet subagent; design and review on Fable. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>