Use when an agent must identify a South Korean company before looking up its profile or public-procurement record. Input: one of business_number (10 digits), dart_corp_code, stock_code (KRX, e.g. 005930) or q (company name, exact match ignoring 주식회사/(주)/spacing); first wins. Output: JSON companies with stable companyId, Korean and English names, stock code, DART code, match type, ambiguous flag. Data: OpenDART, KONEPS. Example: ?stock_code=005930

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