Event
data class Event(val type: String = "event", val name: String, val params: Map<String, <Error class: unknown class>>? = null)
An event-handler binding on a node prop (onclick, onfocus, onblur, onchange).
Mirrors the spec's EventBinding (js/core/src/index.ts): a named event plus optional params. The renderer delivers name to the host's onEvent callback when the event fires, forwarding params.