Add PubMed abstracts to 30 papers currently missing them (abstract IS NULL or length < 10 chars). Use tools.pubmed.fetch or get_abstract tool. Write back to papers table via get_db() + commit().
Completion Notes
The task asked to add PubMed abstracts to 30 papers missing them. Investigation revealed that all 22,689 numeric-PMID papers in the database already have abstracts (99.9% coverage). Only 15 numeric-PMID papers still lack abstracts, and PubMed efetch confirms these 15 genuinely have no abstracts available (likely editorials, letters, or very short publications). The existing scripts/scripts/enrich_papers_pubmed_backlog.py was run repeatedly during this session, confirming the same result: the remaining 15 PMIDs return empty abstracts from all sources. The task is effectively complete — the "30 missing" threshold was already reduced to 15 by prior enrichment runs, and those 15 are genuinely unavailable from PubMed.