docs(design): spec the dupre-clear contrast-first theme, add task

A plan for a contrast-first AAA sibling of the dupre theme. It keeps dupre's hues but builds them Prot's way, with contrast as the founding constraint, where the in-progress dupre revision is mood-first and lands at AA. The spec records the modus methodology analysis, the AA-to-AAA starting palette, the hard blue-keyword decision, and enough context to resume cold months from now. The task in Emacs Open Work links to it.

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