feat: Divi save pipeline – tree_rev lock, kses-safe save, revision, flags, cache, ToolResult

DiviSaver/DiviWriter/DiviComposition/DiviChange, WpValueSanitizer (S4),
WpMediaResolver, DiviFlags (S11), DynamicContentMap from Divi's live
registry (S22), S31 wiring, S35 control strip at apply() entry.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/Pages/WpMediaResolver.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Pages;
+
+use LIT\MCP\Integrations\Divi\Compose\MediaResolver;
+
+/**
+ * Media library images for short-form fields (image_id, portrait_id, image_ids): only images
+ * the current user may read. URL and alt text are cleaned by ShortformWriter like client input.
+ */
+final class WpMediaResolver implements MediaResolver
+{
+    public function image(int $id): ?array
+    {
+        if ($id <= 0 || ! wp_attachment_is_image($id) || ! current_user_can('read_post', $id)) {
+            return null;
+        }
+
+        $url = wp_get_attachment_url($id);
+        if (! is_string($url) || $url === '') {
+            return null;
+        }
+
+        return ['url' => $url, 'alt' => (string) get_post_meta($id, '_wp_attachment_image_alt', true)];
+    }
+}