feat: Divi manifests, adapter register and boundary test

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Integrations/Divi/Release/DiviAdapters.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Release;
+
+defined('ABSPATH') || exit;
+
+/** The Divi boundary (spec §3): the only classes that touch Divi, in the order reports list them. */
+final class DiviAdapters
+{
+    /** @var list<class-string<DiviAdapter>> */
+    public const CLASSES = [];
+
+    /** @return array<class-string<DiviAdapter>, Manifest> */
+    public static function manifests(): array
+    {
+        $manifests = [];
+        foreach (self::CLASSES as $class) {
+            $manifests[$class] = $class::manifest();
+        }
+
+        return $manifests;
+    }
+
+    /** @return list<Mirror> */
+    public static function mirrors(): array
+    {
+        $mirrors = [];
+        foreach (self::manifests() as $manifest) {
+            array_push($mirrors, ...$manifest->mirrors);
+        }
+
+        return $mirrors;
+    }
+}