systemd · easy · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/systemd/logind.conf.d/power.conf with a [Login] section so closing the lid does nothing (HandleLidSwitch=ignore) and an idle session locks (IdleAction=lock) after 15 minutes (IdleActionSec=15min). (Authored config, graded structurally — the engine isn't run here.)
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