- Rename package/module from toki_socket to proto_socket in Dart, Kotlin, Python
- Update crosstest implementations to use renamed packages
- Add new proto_socket skill, deprecate add-toki-socket-crosstest-language skill
- Update domain rules for all languages
- Update documentation (README, PORTING_GUIDE, PROTOCOL, VERSIONING)
- Add WebSocket binary frame support to protocol specification
- Update README and PROTOCOL.md to reflect dual TCP/WebSocket transport
- Add Go implementation with TCP, WebSocket, and heartbeat support
- Include .claude settings configuration
