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Adds the ergonomic native event surface for Go: `node.On<Event>(func(<Payload>))` registers a native listener for that event and the library delivers the typed `<Payload>` POD, which an exported Go callback reads into a Go struct (reusing the generated `fromC`) and hands to the user's handler — no CBOR parsing. Sits beside the existing CBOR `SetEventHandler` (wildcard / inter-process). The example registers `OnEchoFired` and receives a typed `EchoEvent` when Echo fires it. Verified end-to-end with `go run -race`. C/C++/Rust get the same per-event typed handler + router next. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>