Fix WebSocket tests hanging on Windows

- Use localhost instead of server.addr.hostname (0.0.0.0) for WebSocket client connection
- Windows WebSocket implementation cannot connect to 0.0.0.0, causing tests to hang
- localhost resolves correctly on all platforms including Windows

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: taras

websocket/websocket.test.ts

@@ -107,7 +107,7 @@ function useTestingPair({ fail }: TestingPairOptions = {}): Operation<
     );
 
     let client = new WebSocket(
-      `ws://${server.addr.hostname}:${server.addr.port}`,
+      `ws://localhost:${server.addr.port}`,
     );
 
     let next = yield* sockets.next();