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/Compose/ShortformWriter.php

@@ -48,6 +48,8 @@ final class ShortformWriter
      */
     public function apply(string $type, array $attrs, array $values, string $field): array
     {
+        // Ruling S35: controls go before placeholder resolution and trim ("{\0{post:title}}").
+        $values = VariableRef::withoutControlsDeep($values);
         $fields = $this->modules === null ? ShortformMap::fields($type) : ($this->modules[$type] ?? []);
         $errors = [];
         foreach ($values as $name => $value) {