Add II-Commons skill
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Adds II-Commons to Data & Analysis.\n\nII-Commons is an open-source skill and npm CLI for deterministic retrieval across arXiv, PubMed/PMC, and supported US policy corpora. It supports search, metadata lookup, full-document markdown retrieval, and daily-updated corpus freshness checks.\n\nProject: https://github.com/Intelligent-Internet/II-Commons-Skills