Use twitter safe relay

tests/library-exports.test.ts

@@ -1,9 +1,8 @@
 import { describe, expect, it } from 'vitest';
-import { resolveCredentials, TwitterClient } from '../src/index.js';
+import { TwitterClient } from '../src/index.js';
 
 describe('library exports', () => {
   it('exposes primary library surface', () => {
     expect(typeof TwitterClient).toBe('function');
-    expect(typeof resolveCredentials).toBe('function');
   });
 });