docs(theme-selector): settle inheritance as model-and-override in the spec

Craig settled the inheritance question: model it rather than flatten it. Each face's resolved color shows in the table marked as inherited, the mock preview paints every face with its effective color, and overriding any face is one assignment that flips it from inherited to explicit. Export keeps the :inherit relationship for faces left alone and writes explicit attributes only for the ones overridden. Seeded defaults open showing org's real cascade. That clears one of the three open decisions; inventory split and picker timing remain.

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