Paper Metadata Lookup

Resolve one paper identifier into a full metadata record. Primary source is OpenAlex (free, no API key); Crossref is a fallback for DOIs OpenAlex hasn't indexed. The journal name is enriched by delegating to two sibling skills when installed:

• journal-abbrev → ISO-4 / MEDLINE journal abbreviation (JabRef cache, ~25K journals)
• journal-if → curated JCR impact factor

If those skills aren't found, it falls back to AbbrevISO (abbreviation) and OpenAlex 2yr_mean_citedness (approximate IF) automatically.

Critical rule: Always use journal_meta.py. Never fabricate authors, corresponding authors, dates, or impact factors — resolve them.

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