Palette @include reports a circular include when a sprite is used twice as a GIF frame #23

// base.pxl
{ type: "palette", name: "p", colors: { _: "transparent", x: "#ff0000" } }
// anim.pxl
{ type: "sprite", name: "a", size: [4, 4], palette: "@include:base.pxl", regions: { x: { points: [[0, 0]] } } }
{ type: "animation", name: "an", frames: ["a", "a"], duration: 100 }

The first frame is right, but the second renders magenta with Circular include detected: .../base.pxl and
Unknown token x. The include-visited set seems to be shared across frames,
so the second lookup of the same file is treated as a cycle. The same include
works through a composition. Workaround: skull_anim.pxl repeats the
bone palette instead of including it from skull.pxl.

Found while animating examples/skull (#21).

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