A single namespaced counter map on the engine that every service reports
into: ServiceCtx::count(key) is folded in after each command, the engine
bumps its own events (botserv.kick/ban/warn/greet/trigger), and a
per-service command counter (nickserv.command, chanserv.command, …) is
tallied in dispatch. stats_snapshot() merges those with live gauges from
the store (accounts/channels/bots/opers total).
Exposed over gRPC as a new Stats service (Get -> map<string,uint64>),
authorized by the same bearer token as Directory/Accounts — so any
consumer (a dashboard, Django) reads every module's stats through one
pipe. New service is additive to the proto; existing RPCs untouched.
Jean
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