Classify structural genome variants

Load SV VCF and produce per-type counts with size classification

When you have SV VCF output from Manta/Delly/Sniffles and need aggregated counts and size bins.

• · .vcf file (with SVTYPE in INFO)
• · optional --n-svs for demo

• · tables/structural_variants.csv
• · report.md
• · result.json

• · pandas
• · numpy
• · bcftools (optional)

--input required OR --demo flag; VCF must have SVTYPE field for non-unknown entries

• · Pure BND records classify as UNKNOWN (no BND->TRA resolver)
• · nonexistent --input path raises FileNotFoundError
• · SVLEN stored as absolute value

• · Demo VCF verified with synthetic records
• · schema documented in references/output_contract.md
• · adjacent genomics skills reference this