Company name/ticker typeahead search

The company name/ticker typeahead for the fundamentals engine — the discovery entry point you call first to turn what a user types into a concrete ticker, then hand that ticker to the statements, time-series or valuation endpoints. Matching is server-side over the always-current company catalog (sourced from the SEC's own company-tickers list, refreshed daily): a match on ticker (exact match boosted) OR company name (substring), ranked so the obvious hit leads — exact ticker first, then ticker prefixes, then name-contains, ties broken by ticker. Each row carries ticker, company (the entity name) and cik (10-char zero-padded). An empty or whitespace q returns an empty list rather than enumerating the whole universe (a typeahead with no query has no suggestions); limit bounds the result (default 10, capped at 50). Served at the cheapest tier (1 token) so it is safe on every keystroke. Errors: 400 INVALID_PARAM for a non-numeric or non-positive limit.