feat: adapter-level Divi release lock, content-create and site status

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

src/Integrations/WordPress/Content/ContentComposer.php

@@ -29,6 +29,12 @@ interface ContentComposer
      */
     public function writable(): bool;
 
+    /**
+     * Why writing such content is refused right now although it is enabled (e.g. the installed Divi version is not
+     * released for LIT MCP, spec §5.5); null = allowed.
+     */
+    public function refusal(): ?WP_Error;
+
     /**
      * Validates the description for a new entry of $postType. Nothing is written.
      *

src/Integrations/WordPress/Content/ContentCreateAbility.php

@@ -133,6 +133,11 @@ final class ContentCreateAbility implements Ability
             );
         }
 
+        $locked = $withDivi ? $this->divi->refusal() : null;
+        if ($locked !== null) {
+            return $locked;
+        }
+
         $prepared = $this->writer->prepare($postType, $input, true);
         $problem = self::combined($prepared, $withDivi ? $this->checkDivi($postType, $input) : null);
         if ($problem !== null) {