- Add Dart-Kotlin crosstest implementation (dart_kotlin.dart, kotlin_dart.kt)
- Add Dart-Kotlin client implementation for Go (kotlin_dart_client.kt, dart_kotlin_client.dart)
- Update SKILL.md and openai.yaml for crosstest language support
- Improve ws_protobuf_server.dart with better error handling
- Fix crosstest client implementations for Go
- Dart: Add BaseClient<Self> to eliminate duplicate code
- Dart: Replace dispose() with close() (Future<void> return)
- Dart: Make isAlive and nonce read-only with @protected setter
- Dart: Add meta package dependency for @protected
- Dart: Implement BaseClient<ProtobufClient> and BaseClient<WsProtobufClient>
- Dart: Update communicator.dart with private fields and protected setters
- Dart: Update heartbeat_mixin.dart for new close() pattern
- Dart: Update all client/server implementations
- Dart: Update test files with new API
- Dart: Export base_client.dart in toki_socket.dart
- Add Close() method to Communicator for proper resource cleanup
- Move examples from go/example/ to go/examples/
- Move test files to go/test/ directory
- Add cross-test files for Dart-Go interop testing
- Add comprehensive test suite (tcp, ws, tls, heartbeat tests)
- Add crosstest directory for multi-language testing
- Add SKILL documentation for adding crosstest languages
