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Fix LFS tracking + add phylogenetic relationship metadata
Alvin
- Fix .gitattributes: add *.tsv and *.csv LFS rules (missing since
Mar 13 re-init). All TSV/CSV files now properly LFS-tracked.
- Add phylo_pairs.tsv: 386K language pair classifications from
Glottolog CLDF v5.x (99.4% coverage, 45K tests pass)
- Add 4 phylo enrichment scripts + PRD
- Update DATABASE_REFERENCE.md with phylo_pairs documentation
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Add cognate pairs v2 (21.5M pairs) + Phase 8 audit fixes
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initial commit
