feat: structure and content fingerprints, lit/library-find-similar

Fingerprint::structure()/content() (E11) and lit/library-find-similar
(indirect, group Divi-Bibliothek): at most 200 posts per call (cursor),
editable entries only (own posts without edit_others_posts), contents
primed in chunks of 50, stops at 200 matches or 5000 compared nodes with
a note; library entries and Theme Builder layouts are never scanned.

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

src/Integrations/Divi/Library/LibraryIntegration.php

@@ -12,11 +12,13 @@ use LIT\MCP\Integrations\Divi\Pages\DiviSaver;
 use LIT\MCP\Integrations\Divi\Pages\DiviWriter;
 use LIT\MCP\Integrations\Divi\Schema\DiviModules;
 use LIT\MCP\Integrations\Integration;
+use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
 
 defined('ABSPATH') || exit;
 
 /**
- * The group "Divi-Bibliothek" (E9): lit/library-list, lit/library-save and lit-library-insert (direct).
+ * The group "Divi-Bibliothek" (E9): lit/library-list, lit/library-save, lit-library-insert (direct) and, with the
+ * content schema, lit/library-find-similar (E11).
  * Built by DiviIntegration::library() so it shares the library access (rights, Tools-tab gates –
  * its id LibraryAccess::GROUP is what the P9 hiding and the write gate ask). Available with the
  * Divi 5 builder, like the Divi group.
@@ -32,7 +34,8 @@ final class LibraryIntegration implements Integration
         private DiviSaver $saver,
         private ChangeLog $log,
         private DiviModules $modules,
-        private ?Closure $diviWritable = null
+        private ?Closure $diviWritable = null,
+        private ?ContentSchema $schema = null
     ) {
     }
 
@@ -53,7 +56,7 @@ final class LibraryIntegration implements Integration
 
     public function abilities(): array
     {
-        return [
+        $abilities = [
             new LibraryListAbility(
                 $this->access,
                 $this->loader,
@@ -70,5 +73,10 @@ final class LibraryIntegration implements Integration
             ),
             new LibraryInsertAbility($this->writer, $this->access, $this->diviWritable),
         ];
+        if ($this->schema !== null) {
+            $abilities[] = new LibraryFindSimilarAbility($this->access, $this->loader, $this->schema);
+        }
+
+        return $abilities;
     }
 }