The eight scope helpers (transport-code HMAC match, decode field extraction, reply-scope resolution, route-type and eligibility checks, the confirmed-global test and the scoped/global/unknown classifier) used no handler state beyond the logger. They are now plain functions in scope_gate.py; MessageHandler keeps every old private name as a staticmethod alias or a one-line delegate passing its logger, so the tests that call them on handler instances, including object.__new__ ones, are untouched. The RF-correlation markers and rf_data_is_correlated move to rf_match.py, which both modules import; message_handler re-exports them.
Bodies moved verbatim apart from dropping self. scope_gate is a new module, so mypy checks it.
