Emitter

gonest.Emitter — framework singleton, resolvable via MustInject[*gonest.Emitter] in any module.

Symbol	Description
`NewListener(func(listener *gonest.Listener) {...})`	Build a listener.
`MustOn[EventType](listener, handler)`	Free function (not a method) registering a typed handler.
`Emitter.Emit(event)`	Fire-and-forget; one goroutine per listener; panics/errors recovered internally.

No wildcard/string-pattern events — events are typed by Go struct.