Bernardo Magri 95101fda3f fix(sddm): default autoLogin off, not on with hardcoded "nomarchy" ...

`themes/engine/sddm.nix` defaulted `services.displayManager.autoLogin`
to `enable = true; user = "nomarchy";` (both mkDefault). The installer
flow overrode both with the real username at normal priority, so this
was invisible there — but a hand-migrated user (per docs/MIGRATION.md)
who imported `nomarchy.nixosModules.system` without setting
`autoLogin.user` would auto-login as a nonexistent "nomarchy" user and
SDDM would error. `docs/MIGRATION.md` even documented the override as a
post-import chore.

Flipped the default to `enable = lib.mkDefault false`. Installer
generates `enable = true` directly so its flow is unchanged. Migration
flow now gets the safe default — opt-in instead of opt-out — and the
docs row is updated to reflect the new shape.

The hardcoded "nomarchy" username fallback for `autoLogin.user` is the
same class of bug as the impermanence persistence block was. A future
roadmap row to consolidate "primary user" across impermanence,
autoLogin, and any future modules might be worthwhile, but it's
deferred — this commit is the immediate fix.

Found during Pillar 8 audit of first-boot UX.

2026-05-19 18:46:41 +01:00

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