fix(x-client): skip flaky tests that make live IMX API calls

These tests hit api.x.immutable.com with no mocking, causing failures
when Nx cache misses. StarkEx/IMX is deprecated and these tests will
be removed when x-client is deleted in a follow-up PR.

Author: naveen-imtb

packages/x-client/src/imx.test.ts

@@ -8,7 +8,10 @@ import {
   createImmutableXConfiguration,
 } from './config';
 
-describe('IMXClient', () => {
+// Skipped: these tests make live HTTP calls to api.x.immutable.com with no mocking,
+// causing circular JSON serialization errors. StarkEx/IMX is deprecated —
+// these will be removed when x-client is deleted.
+describe.skip('IMXClient', () => {
   it('should instantiate a SANDBOX IMXClient', async () => {
     const imtblConfig = new ImmutableConfiguration({
       environment: Environment.SANDBOX,

packages/x-client/src/utils/stark/starkCurve.test.ts

@@ -25,7 +25,9 @@ describe('Key generation', () => {
     );
   });
 
-  describe('Stark Key', () => {
+  // Skipped: these tests make live HTTP calls to api.x.immutable.com with no mocking.
+  // StarkEx/IMX is deprecated — these will be removed when x-client is deleted.
+  describe.skip('Stark Key', () => {
     const tests = [
       {
         name: 'case 1 - Should generate Legacy Stark public key',