* HousekeepingBanUserComposer (OutgoingHeader 9102): (userId,
reason, hours).
* HousekeepingActionResultEvent + Parser (IncomingHeader 9201):
generic ack carrying (actionKey, ok, actionId, message). Same
parser will back mute / kick / give-credits / room-close / etc.
callers — adding a new HK action only needs a new outgoing
composer plus the right ACTION_KEY constant on the server side.
vitest 138/138, `yarn compile:fast` clean.
simoleo89