feat(topics): restore topic taxonomy workflow

tests/widget-system/tab-posts-render-harness.php

@@ -120,6 +120,7 @@ namespace {
 	function get_the_ID(): int { return (int) ($GLOBALS['tab_fixture_current_post']->ID ?? 0); }
 	function strip_shortcodes(string $value): string { return $value; }
 	function get_the_category(int $id = 0): array { unset($id); return []; }
+	function get_the_terms(int $id, string $taxonomy): array { unset($id, $taxonomy); return []; }
 	function get_the_tags(int $id = 0): array { unset($id); return []; }
 	function get_the_excerpt(int $id = 0): string { unset($id); return '首页通用文章列表的长摘要，这里只用于卡片和列表样式的内容渲染'; }
 	function get_post_field(string $field, int $id = 0, string $context = 'display'): string {