GLEIF LEI ↔ 法人番号 bridge

GLEIF LEI (Legal Entity Identifier) <-> 法人番号 bridge (jpverify.lei; the method and the measured coverage are summarised in /llms.txt and below). Provide exactly one of corporate_number=/t_number= (-> the corporation's LEI, if GLEIF's golden copy maps one) or lei= (-> the 法人番号 it maps to, if any). Honest scope: only a measured ~20% of JP-jurisdiction LEIs have a number-based or exact-name join to a 法人番号 today (the join is by the 法人番号 GLEIF records as the registration authority id, else by an exact normalised legal name — nothing fuzzy) — a null lei is the ordinary, correctly-reported case, not a lookup failure. When more than one LEI maps to the same 法人番号, the chosen one prefers an ISSUED registration then the most recently updated (see lei_candidates for the total). GLEIF publishes this data under CC0 1.0 (no attribution required); a response also carrying houjin-bangou data still owes the NTA attribution for that half. Where the bridge is not configured this returns 503.