docs(theme-studio): add seeding-engine spec

The seeding engine turns the color guide's seed table into executable defaults: a role-to-treatment table, a face-to-role map per tier (syntax, UI, org), and a pure seed() that opens the tool guide-correct and reseeds dupre-revised to the compact mapping. v1 generates the shades with OKLCH, reusing the perceptual-metrics colormath.js core, so it sequences after that feature's Phase 1. todo.org carries the two implementation phases.

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