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modules/home/autotheme.nix installs a user service + timer (nomarchy-auto-theme) that periodically runs `nomarchy-theme-sync auto`, so the day/night theme is applied on the current schedule through the same one engine. Install gates on settings.autoTheme.enable (read from state, the way updates.nix gates on its enable), so a machine not using the feature carries no timer. Timer: OnStartupSec=1min (settle after login) + OnCalendar=*:0/15 + Persistent (catch a transition missed while off). Periodic rather than exact sunrise/sunset timers — robust to suspend/DST, and `auto` is idempotent (no rebuild unless the theme must change) so ticks are cheap. Verification: V1 — real-config eval (state temporarily enabled, then restored) confirms the units land when enabled (OnCalendar *:0/15, ExecStart `... nomarchy-theme-sync auto`) and are absent when disabled; systemd-analyze validates the schedule. V0 flake check green. The live timer -> home-manager switch on a real Nomarchy session is pending a Nomarchy machine (same blocker as #76). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>