Compositions ignore derived-sprite shift and the {sprite, x, y} layer renders nothing #17

{ type: "palette", name: "p", colors: { _: "transparent", x: "#ff0000" } }
{ type: "sprite", name: "dot", size: [4, 4], palette: "p", regions: { x: { points: [[0, 0]] } } }
{ type: "sprite", name: "dot_moved", palette: "p", source: "dot", transform: ["shift:2,2"] }
{ type: "composition", name: "scene", size: [4, 4], cell_size: [4, 4],
  sprites: { D: "dot_moved" }, layers: [{ map: ["D"] }] }

pxl render -s dot_moved puts the dot at (2,2), but pxl render -c scene puts
it at (0,0). The composition path (render_composition_to_image) renders the
resolved regions and skips the derived sprite's image transform. The
{ sprite, x, y } layer form in format/composition.md doesn't help either: it
renders an empty canvas. The only offset left is cell_size with a
mismatched map, and that warns on every render. Workaround: the talking
poses skull_jaw_ajar and skull_jaw_open are written out in full as their
own sprites, not as shift-ed copies of skull_jaw.

Found while drawing examples/skull (#13). The repro is checked against main.

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