MODE <#channel> <modes> lets the founder set channel modes through
ChanServ (sourced from ChanServ). The mode string is passed through, so
simple modes and masks work; founder-gated.
Channel modes (+r, mode lock, auto-op, enforcement) are sent from the
ChanServ pseudoclient instead of the services server, so users see
ChanServ as the setter. The engine locates the channel-managing service;
the FMODE filter now ignores anything under our SID prefix (server and
pseudoclients) so enforcement can't loop on our own changes.
Founders lock channel modes with MLOCK <#channel> [modes]. The lock is a
ChannelMlock event, so it replicates and compacts like everything else;
it is applied on channel creation alongside +r and enforced by reverting
any FMODE that breaks it. Our own changes are filtered so enforcement
can't loop. Simple (paramless) modes for now.
INFO prints the founder and a UTC registration date instead of a raw
Unix timestamp (formatted with a small civil-date helper, no date crate),
and the notices are reworded to read more naturally.
ChanServ sends FMODE to mark a registered channel +r (the m_services
c_registered mode), and -r on drop. Sourced from our server, which the
ircd requires for that mode, with a low TS so it applies to the existing
channel.
REGISTER/INFO/DROP with founder auth, stored as ChannelRegistered and
ChannelDropped events so channel registrations replicate across nodes
and compact like accounts. Registration requires an identified account;
only the founder can drop.
