accent: UDT_ROTATION, a light run for timed wallpaper changes

The wallpaper engine changes wallpapers on a timer and runs wallp, which
runs udt-accent. Nobody sees GRUB, the homepage or SDDM mid-session, and
GRUB costs a rebuild and the homepage an scp on every change. With
UDT_ROTATION set and non-empty, write_sddm, write_grub, write_homepage
and the udt-grub and udt-homepage helpers are skipped; everything else
still runs. A manual change is a full run and brings them level.

The selftest swaps every writer and both subprocess calls for recorders
and checks the exact set of calls with the variable empty and set.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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