[Forge] Add PubMed abstracts to 50 papers missing them (continuation of 00c80a0a) done

Many papers in the corpus lack PubMed abstracts. Existing task 00c80a0a covers 20 papers. There are ~1173 remaining papers with no abstract. Search PubMed for each paper's abstract using the PMID, fetch the abstract, and update the papers table. Verification: - 50 papers gain non-null abstract field - Each abstract is at least 100 characters - papers.metadata enriched with pubmed_fetched_at timestamp

Git Commits (1)

{
  "completion_shas": [
    "4754683ee"
  ],
  "completion_shas_checked_at": ""
}

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