docs(theme-studio): add perceptual color metrics spec

The spec adds OKLCH editing, perceptual-lightness and APCA readouts, and a pairwise ΔE distinguishability check to the theme-studio, so it can build deliberately low-contrast themes by metric instead of by eye. The testing strategy extracts the color math into a Node-unit-tested colormath.js core, with the browser hash tests reduced to UI wiring and coverage measured on that core. todo.org carries the five implementation phases and the manual-validation checklist.

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