Universal security-identifier resolver. Give exactly one of ticker, isin, or lei and get the others back — ticker, SEC CIK, FIGI (incl. composite + share-class), LEI, and ISINs — plus the canonical issuer name. The one call that joins a security across the systems agents actually use: CIK for filings, FIGI for trading, LEI for the legal entity, ISIN for settlement. Composes SEC EDGAR, OpenFIGI, and GLEIF (CC0). Per-source status is returned, so a partial match is explicit rather than silently wrong. Note: CUSIP/SEDOL are accepted by sibling /finance/figi as inputs but never emitted here (licensed); ISINs come from GLEIF CC0 data.

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