Intelligence Bank Health

FDIC Call Report health (ROA/ROE/assets/equity) for ticker's lead bank subsidiary (services/fdic_banking_service.py). Only populated for the handful of major publicly-traded bank holding companies this module explicitly maps to a real FDIC certificate number (see _TICKER_TO_CERT) -- any other ticker returns data: null, never a guessed match. Reflects the regulated bank subsidiary's own Call Report, not consolidated holding-company GAAP financials.