cursor.sg — procedural 16×16 arrow sprite with save-under and move. CURSOR-ARROW-PASS verified. The cursor saves the framebuffer region under it before drawing, and restores it on move — flicker-free cursor rendering without double-buffering.
Paired with video/cursor.sg in sigil-os (20d85f3) — the OS-level mouse cursor sprite integration. The cursor is the first visible input feedback in sigilOS's desktop environment.