refactor: GlobalUsages sucht über UsageQuery – Bibliothekssuche als LibraryUsageQuery

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Integrations/Divi/Library/UsageQuery.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Library;
+
+defined('ABSPATH') || exit;
+
+/**
+ * What GlobalUsages looks for (ruling P23 pattern, fail closed): a prepared SQL condition on post_content that
+ * keeps every post that may reference the thing (one query, ID/status/type only), and the decision on the
+ * content of each candidate. A library entry (LibraryUsageQuery), a preset (PresetUsageQuery, Etappe 4) …
+ */
+interface UsageQuery
+{
+    /** A condition for "WHERE (…)", already passed through $db->prepare(). */
+    public function candidateCondition(\wpdb $db): string;
+
+    /** Whether $content references the thing; true when unsure (fail closed). */
+    public function matches(string $content): bool;
+}