refactor: rename for intent (L3)

PostChangeResult is PostSaveFollowUp (the after-save pipeline, not a
result); DiviChange::changed() is record() (moved nodes are recorded but
not touched). cleanValue/withoutControls were renamed in wave 2.

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

src/Integrations/Divi/Pages/DiviWriter.php

@@ -13,7 +13,7 @@ use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
 use LIT\MCP\Integrations\Divi\BlockTree\Outline;
 use LIT\MCP\Integrations\Divi\BlockTree\Serializer;
 use LIT\MCP\Integrations\Divi\Design\DesignSystemReader;
-use LIT\MCP\Integrations\WordPress\PostChangeResult;
+use LIT\MCP\Integrations\WordPress\PostSaveFollowUp;
 use WP_Error;
 
 /**
@@ -114,7 +114,7 @@ class DiviWriter
             $warnings[] = self::OUTLINE_TRUNCATED;
         }
 
-        $result = (new PostChangeResult(
+        $result = (new PostSaveFollowUp(
             $ability,
             $this->log,
             (int) $post->ID,