Auth First Run (#1207)

Co-authored-by: Tommaso Sciortino <sciortino@gmail.com>
Co-authored-by: N. Taylor Mullen <ntaylormullen@google.com>

packages/core/src/code_assist/oauth2.ts

@@ -192,3 +192,11 @@ async function cacheCredentials(credentials: Credentials) {
 function getCachedCredentialPath(): string {
   return path.join(os.homedir(), GEMINI_DIR, CREDENTIAL_FILENAME);
 }
+
+export async function clearCachedCredentialFile() {
+  try {
+    await fs.rm(getCachedCredentialPath());
+  } catch (_) {
+    /* empty */
+  }
+}