feat(iso): add Gamescope session and systemd user units#3
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Creates the complete systemd unit set for the MinecrarchOS session layer. These units define the boot flow: autologin → gamescope-session → minecrarch-shell → services iso/airootfs/etc/systemd/user/: - gamescope-session.service: launches Gamescope --fullscreen with minecrarch-shell as child; RestartSec=3s, StartLimitBurst=3 to prevent boot loops on repeated Gamescope failures - minecrarch-shell.service: Requires=modpack-manager, starts after logging + modpack-manager are on D-Bus - minecrarch-modpack-manager.service: Type=dbus with BusName so systemd knows the service is ready when it registers on the bus - minecrarch-logging.service: starts first (no After= other than dbus) - minecrarch-overlay.service: non-critical, After=logging - minecrarch-updater.service: non-critical, After=logging, RestartSec=5s - default.target.wants/gamescope-session.service: symlink for autostart iso/airootfs/etc/systemd/system/getty@tty1.service.d/autologin.conf: - autologin for 'minecrarch' user; double ExecStart= pattern clears the default before setting the autologin variant (systemd override convention) Service startup order per docs/session-model.md: logging → [modpack-manager, overlay, updater] in parallel → shell ADR-0005 (Gamescope), ADR-0006 (no DE), ADR-0009 (shell orchestration)
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Summary
Define el conjunto completo de systemd units para la capa de sesión de MinecrarchOS. Implementa el boot flow definido en
docs/session-model.md:Files
gamescope-session.service— lanza Gamescope--fullscreencon el shell como child; StartLimitBurst=3 para prevenir boot loopsminecrarch-shell.service—Requires=modpack-manager, arranca después de logging + modpack-manager en D-Busminecrarch-modpack-manager.service—Type=dbuscon BusName; systemd espera hasta que el servicio se registra en el busminecrarch-logging.service— arranca primero (solo depende de dbus)minecrarch-overlay.service— no-crítico, After=loggingminecrarch-updater.service— no-crítico, After=logging, RestartSec=5sdefault.target.wants/gamescope-session.service— symlink de autostartgetty@tty1.service.d/autologin.conf— autologin para usuariominecrarchStartup ordering (per docs/session-model.md)
ADR references
ADR-0005 (Gamescope como compositor de sesión), ADR-0006 (sin DE), ADR-0009 (shell como capa de orquestación)