Implement the high-level, idiomatic Go Messaging API mirroring the Nim
MessagingClient, on top of the internal/ffi/liblogosdelivery bridge.
- MessagingClient: New/Start/Stop/Close, Subscribe/Unsubscribe,
Send -> RequestID. (Named to match the Nim MessagingClient.)
- Unified Events() <-chan Event with a sealed Event interface
(MessageReceived/Sent/Propagated/Error, ConnectionStatus). Events are dropped
(never block) if a consumer falls behind.
- Event decoding handles liblogosdelivery's std/json wire format: received
payload/meta arrive as JSON byte-int arrays (not base64), with base64 + null
fallbacks; connectionStatus as an enum-name string. Unit-tested.
- Config aliases the kernel WakuNodeConf.
- examples/messaging: runnable demo.
Part of #106 (Store + kernel accessors follow after logos-delivery#3851).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
