Round 2 of distro branding, text half: tuigreet now shows
'Welcome to <distroName>', and users.motd carries a branded banner that
doubles as a cheat sheet for the distro helpers (sys-update, home-update,
nomarchy-theme-sync, SUPER+?). Both key off system.nixos.distroName so the
brand name stays in one place.
Deferred (need an asset / a boot test): ISO splashImage/grubTheme art and
the distroId switch.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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