Extend disjunction-conjecture empirical table to n=12

Disjunction (every maximal planar graph is a derived level graph or
intertwining tree) holds through n=12. New intertwining-only iso class
at n=12 (analog of T*_9 at n=9) brings the count of derived-resistant
iso classes to 2 in this range. Per the intertwining-tree ⟺
Hamiltonian-dual equivalence, intertwining-tree failures cannot occur
until n=21 (dual of the 38-vertex Holton-McKay minimum Tait
counterexample).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

papers/even_level_graph_generators/paper.log

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papers/even_level_graph_generators/paper.tex

@@ -280,6 +280,7 @@ $8$  & $14$   & $0$ & $0$ & $14$   & $0$ & holds \\
 $9$  & $50$   & $0$ & $1$ & $49$   & $0$ & holds \\
 $10$ & $233$  & $0$ & $0$ & $233$  & $0$ & holds \\
 $11$ & $1249$ & $0$ & $0$ & $1249$ & $0$ & holds \\
+$12$ & $7595$ & $0$ & $1$ & $7594$ & $0$ & holds \\
 \end{tabular}
 \end{center}