Verify Citations

The anti-hallucination gate for bibliographies. Takes a .bib file, validates every entry against live scholarly indexes (Crossref, DBLP, Semantic Scholar, arXiv, DataCite), and produces a per-entry verdict: VERIFIED, MISMATCH, UNRESOLVED (possible fabrication), or RETRACTED. One fabricated citation in a submitted paper can end a review — or a reputation. Be rigorous here.