chore: add e2e test env vars to ciOnlyEnvVars

- Add GH_TEST_EMAIL, GH_TEST_PASSWORD, GH_TEST_TOTP_SECRET
- Add CODEBUFF_E2E_URL_FILE for file-based IPC

Author: brandonkachen

packages/internal/src/env-schema.ts

@@ -34,7 +34,13 @@ export type ServerEnv = z.infer<typeof serverEnvSchema>
 
 // CI-only env vars that are NOT in the typed schema
 // These are injected for SDK tests but should never be accessed via env.* in code
-export const ciOnlyEnvVars = ['CODEBUFF_API_KEY'] as const
+export const ciOnlyEnvVars = [
+  'CODEBUFF_API_KEY',
+  'GH_TEST_EMAIL',
+  'GH_TEST_PASSWORD',
+  'GH_TEST_TOTP_SECRET', // TOTP secret for GitHub 2FA automation
+  'CODEBUFF_E2E_URL_FILE', // File-based IPC for e2e login tests
+] as const
 export type CiOnlyEnvVar = (typeof ciOnlyEnvVars)[number]
 
 // Bun will inject all these values, so we need to reference them individually (no for-loops)