docs(theme-studio): add face coverage master list

I added a hierarchical worklist of every known face: the live Emacs face-list unioned with everything the studio manages, grouped by package. Each face is marked DONE where the studio themes it, TODO where it doesn't, and each group is DONE, DOING, or TODO by how much of it is covered.

690 of 1293 faces are covered today. The gaps are mostly org, gnus, erc, custom, diff, and the built-in subsystems the package inventory doesn't reach yet.

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