fix(client): Fix CI configuration, prevent socket hangs with auto-drain, and apply various client/core TypeScript fixes and test updates

ts/core_fetch/index.ts

@@ -1,3 +1,3 @@
 // Core fetch exports - native fetch implementation
 export * from './response.js';
-export { CoreRequest } from './request.js';
+export { CoreRequest } from './request.js';