GDM AlphaGenome Variant Analysis skill

The alphagenome-single-variant-analysis skill from Google DeepMind's Science Skills collection. Given a variant in chr:pos:ref>alt form (or a gene/region query), it calls the AlphaGenome API to predict effects on RNA-seq expression, DNase chromatin accessibility, ChIP histone marks, and transcription-factor binding, and its own SKILL.md description names the workflow's actual purpose -- 'non-coding variant effects, pathogenicity, clinical significance, disease associations' -- alongside sibling skills in the same repository for clinvar_database, gnomad_database, and dbsnp_database lookups, confirmed live via direct fetch of the skills directory listing. Verified live via direct fetch of the skill's SKILL.md and its internal project documentation (a biological-interpretation and pre-report reasoning checklist), plus the repository's published technical report on the Science Skills collection. Terms check: the repository's root LICENSE is Apache-2.0 (confirmed by direct fetch and by plugin.json's license field), and the repository's own SKILL_LICENSES.md separately documents that individual skills reference third-party data sources (AlphaGenome, ClinVar, gnomAD, etc.) carrying their own terms of use -- a data-usage-terms disclosure, not a code-licence divergence, so Apache-2.0 is recorded as this entry's license without qualification. The collection is built and documented primarily for Google's Antigravity harness (distributed via the open Agent Skills standard's npx skills add); Antigravity has no matching entry in this registry's closed harness vocabulary (schemas/vocab/harnesses.json), so host_runtimes is omitted below rather than mapped to an unverified value. No slug collision with any existing entry in this registry.