Two channel operator tools:
- MODE <#chan> <modes> [params] forces a channel mode change (TS 1, so it
applies regardless of the current TS). A status-mode target may be given
as a nick — it's resolved to the uid the ircd's FMODE expects.
- KICK <#chan> <nick> [reason] removes a user, sourced from OperServ and
attributed to the operator.
Both admin-gated. To resolve status-mode params, channel-mode parameter
arity became one shared helper (chanmode_takes_param + STATUS_MODES in the
api): the ircd module now delegates to it instead of keeping its own copy,
so burst-parsing and MODE-building can never drift.
