feat: add compute_haplotypes tool

[ameynert]

Summary

• Ports compute_haplotypes.py from human-diversity-reference/scripts as a defopt-compatible toolkit tool
• Reads VCF files, annotates variants with gnomAD population allele frequencies, and extracts phased haplotypes per population using two overlapping genomic windows
• Writes the union of both windows as a keyed Hail table
• Extracts the inner get_haplotypes function to module-level _get_haplotypes and replaces typer.echo with logging

Test plan

• uv run --directory divref poe check-all passes

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch am_07_compute_haplotypes

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