feat(theme-studio): add reproducible face-coverage generator and diff

face-coverage.org was rebuilt by a throwaway /tmp script each time. This makes it reproducible: face-coverage-dump.el dumps every face's name, docstring, and defface file from the live daemon (plus all group docs and package summaries), and face_coverage.py turns that into the tiered worklist (emacs-core / emacs-general / per-package), classifying each face by where its defface lives. make face-coverage regenerates the file; make face-coverage-diff reports the coverage delta against the committed copy.

The dump binds coding-system-for-write so writing the docstring JSON never drops into the interactive coding-system prompt. I validated the builder by regenerating and diffing against the hand-built worklist: headings identical, only the intro and one sharper description differ.

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