Email capture sections from real pages

How concentrated page shapes are, corpus-wide

36 distinct page shapes cover half of the 2474 pages we've measured; the top 10 cover 34%. The most common, nav → hero → content → footer, alone accounts for 297 of them (12%) — its content element is the classifier’s terminal fallback (a band nothing else matched), not a named section. Once the unnamed content fallback is removed from every sequence, 413 distinct shapes remain (down from 821 raw) and the top 10 cover 51% — the raw distinct counts move with detector coverage, not with design, so concentration is the number worth citing. Measured across the funnels we've walked: saas 83% · ecommerce 12% · affiliate 5% · lead gen 1%.