- Fill in the abstract and add a Section 1 introduction.
- Rename "cubic-graph edge contraction" -> "edge suppression" throughout
(section, definition, theorem, captions, prose, labels). The PNG
filenames keep their old paths and still resolve.
- Reframe edge suppression as a classical operation we recall, not a new
concept we introduce; the face-monochromatic-pair conjecture (with its
strengthening) is the sole contribution.
- Add a bibliography citing Appel-Haken Parts I and II, Robertson-Sanders-
Seymour-Thomas, and Gonthier, and \cite them in the intro.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
didericis
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