"oy" is ѹ: 571,753 multi-character confusable pairs nobody is checking for

The first systematic, font-specific multi-character confusable dataset. 676 Latin bigrams tested against 133,000 single-character targets across 245 fonts using geometric SDF comparison. 571,753 pairs found, including 'rn' matching 'm' in 95 fonts and 'oy' matching Cyrillic ѹ at distance 0.000.