Simplify relay request headers

tests/twitter-client-coverage.core.test.ts

@@ -15,7 +15,7 @@ type TwitterClientPrivate = TwitterClient & {
   refreshQueryIds: () => Promise<void>;
   fetchWithTimeout: (url: string, init: RequestInit) => Promise<ResponseLike>;
   ensureClientUserId: () => Promise<void>;
-  getBaseHeaders: () => Record<string, string>;
+  getHeaders: () => Record<string, string>;
   fetchUserArticlePlainText: (userId: string, tweetId: string) => Promise<{ title?: string; plainText?: string }>;
   fetchTweetDetail: (tweetId: string) => Promise<{ success: true } | { success: false; error: string }>;
   postStatusUpdate: (input: { text: string }) => Promise<{ success: boolean; error?: string }>;
@@ -108,7 +108,7 @@ describe('TwitterClient core coverage', () => {
     expect(result.error).toBe('Tweet not found in response');
   });
 
-  it('adds client user id header after ensureClientUserId', async () => {
+  it('does not add Twitter headers after ensureClientUserId', async () => {
     const client = new TwitterClient({ relayBaseUrl: testRelayBaseUrl });
     process.env.NODE_ENV = 'production';
 
@@ -119,9 +119,9 @@ describe('TwitterClient core coverage', () => {
 
     const clientPrivate = client as unknown as TwitterClientPrivate;
     await clientPrivate.ensureClientUserId();
-    const headers = clientPrivate.getBaseHeaders();
+    const headers = clientPrivate.getHeaders();
 
-    expect(headers['x-twitter-client-user-id']).toBe('42');
+    expect(headers).toEqual({});
   });
 
   describe('fetchUserArticlePlainText failures', () => {