Add small-n ELG counting experiment (iso, rooted)

count_elgs.py enumerates triangulation iso-classes and counts Even Level
Graphs (G,v) per n: iso-classes (sources up to Aut) and flag-rooted
(4E/|Aut| * s, an exact integer since Aut acts freely on flags).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

papers/level_resolutions_of_maximal_planar_graphs/paper.fls

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