Introduction now positions the tire-tree decomposition against
Birkhoff, Tutte, Heesch, Robertson-Sanders-Seymour-Thomas, and
Dvorak-Lidicky's coloring count cones (closest modern parallel).
Floor-containment conjecture refuted at n=4 and n=6: explicit
counterexample colorings (1,2,1,2), (1,3,2,1,3,2), (2,3,2,3,2,3)
absent from non-floor supports. Skip-m=3 sweep through m=8 partial
still consistent with floor-stability-in-m.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
didericis
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