headless ant/term ↗

feat: kitty graphics relative placements and under-background z-index P=/Q=/H=/V= position a placement against another one instead of the cursor: the parent may be an anchored placement, another relative one (up to RELATIVE_MAX_DEPTH, ETOODEEP beyond), or a virtual placement, which sits at the top-left of the placeholder cells showing it. Positions are resolved per frame from the parent, so children follow scrolling and a re-placed parent; ENOPARENT/ECYCLE/EINVAL are reported at creation, deleting a parent deletes its relatives (and an image left with no placement), and the sweep drops orphans. Placements below INT32_MIN/2 draw under non-default cell backgrounds but over the default one: the background pass splits in two around them, only when such an image is on screen. Visible placements are now computed once per frame and shared by the image passes. Command '['nix-store', '--query', '--all']' returned non-zero exit status 1.