Restore missing YFull markers for ~12,000 deep clades (e.g. E-Z15929)

Commit 6e50d75 filtered YFull positions to SNP names present in v14 snp_map.txt
to remove ISOGG-only markers, but this also dropped the gap-fill markers (whose
names are not in snp_map.txt), re-orphaning ~9,270 tree nodes — including
E-Z15929/E-FT6657 — so the YFull tree could no longer resolve them.

Restore those markers additively across hg38/hg19/t2t from the last good state
(d4fbd18): rows for currently-orphaned haplogroups, clean SNPs only (indels and
ISOGG SNPs excluded). hg38 orphaned nodes drop 13,080 -> 739. Existing rows are
untouched, so the ISOGG-removal that fixed mixture false-vetoes is preserved.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: 6bass6