fix: stabilize Claude usage cache across token refreshes

src/token-refresh.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect, it } from 'vitest';
 
-import { shouldStartTokenRefreshLoop } from './token-refresh.js';
+import {
+  applyUpdatedTokensToEnvContent,
+  shouldStartTokenRefreshLoop,
+} from './token-refresh.js';
 
 describe('shouldStartTokenRefreshLoop', () => {
   it('starts refresh for the Claude service', () => {
@@ -10,4 +13,32 @@ describe('shouldStartTokenRefreshLoop', () => {
   it('skips refresh for the Codex service', () => {
     expect(shouldStartTokenRefreshLoop('codex')).toBe(false);
   });
+
+  it('updates both multi-token and single-token env vars when present', () => {
+    const next = applyUpdatedTokensToEnvContent(
+      [
+        'CLAUDE_CODE_OAUTH_TOKEN=old-primary',
+        'CLAUDE_CODE_OAUTH_TOKENS=old-primary,old-secondary',
+        'OTHER=value',
+      ].join('\n'),
+      ['new-primary', 'new-secondary'],
+    );
+
+    expect(next).toContain('CLAUDE_CODE_OAUTH_TOKEN=new-primary');
+    expect(next).toContain(
+      'CLAUDE_CODE_OAUTH_TOKENS=new-primary,new-secondary',
+    );
+  });
+
+  it('adds the multi-token env var when it is missing', () => {
+    const next = applyUpdatedTokensToEnvContent(
+      ['CLAUDE_CODE_OAUTH_TOKEN=old-primary', 'OTHER=value'].join('\n'),
+      ['new-primary', 'new-secondary'],
+    );
+
+    expect(next).toContain('CLAUDE_CODE_OAUTH_TOKEN=new-primary');
+    expect(next).toContain(
+      'CLAUDE_CODE_OAUTH_TOKENS=new-primary,new-secondary',
+    );
+  });
 });