feat(wpmc S4): TermMeta registers ACF main_page_alt on taxonomy town

Add acf-stubs.php + TestCase::setUp() require-after-Patchwork pattern so
acf_add_local_field_group is Patchwork-instrumented and re-interceptable
across FieldGroupTest and TermMetaTest in the same PHP process.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/TestCase.php

@@ -14,6 +14,9 @@ abstract class TestCase extends BaseTestCase
     {
         parent::setUp();
         Monkey\setUp();
+        // Load ACF stubs through Patchwork's stream wrapper (AFTER setUp activates it)
+        // so the functions can be redefined across test classes in the same process.
+        require_once __DIR__ . '/acf-stubs.php';
         Monkey\Functions\stubTranslationFunctions();
         Monkey\Functions\when('shortcode_atts')->alias(function (array $defaults, array $atts): array {
             return array_merge($defaults, array_intersect_key($atts, $defaults));