refactor: DiviTextSearch out of the replace-text ability (M2)

The SQL prefilter and the per-page hit computation move to DiviTextSearch;
DiviPageLoader::loadWritable serves DiviWriter::page and the dry run;
PostStatuses::NOT_CONTENT replaces the duplicated status list (same set,
order in the SQL list only). The private log() wrapper is inlined.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Integrations/Divi/Pages/DiviPageLoader.php

@@ -66,6 +66,17 @@ class DiviPageLoader
         return new DiviPage($post, $document, NodeIndex::build($document));
     }
 
+    /** The entry loaded for writing and checked by writable() – the refusal of either step. */
+    public function loadWritable(mixed $postId): DiviPage|WP_Error
+    {
+        $page = $this->load($postId, true);
+        if ($page instanceof WP_Error) {
+            return $page;
+        }
+
+        return $this->writable($page) ?? $page;
+    }
+
     /**
      * Additional checks for writing: the type must use the Divi builder, the content must be a
      * Divi 5 layout (or empty) and saving must not publish a missed schedule (spec §2).