Resolve missing Registration (Xs, XS, Xz, XZ) and named color (Xx, XX)
operators in AI ArtStyle filter definitions so objects styled with
Registration swatches correctly resolve their paint instead of falling
back to the previously set graphics state color.
Also exclude Registration paints from color-model inference when read via
Xx/XX, and correctly extract tint (penultimate operand) for name-free Xz.
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