fix: final review minors m-1 to m-8

- m-1: the no-change Divi result carries preview_url/edit_url too
- m-2: overview names replace-text's per-page tree_rev
- m-3: divi-shortform documents validation_failed vs not_found for unknown IDs
- m-4: DiviWriter/DiviPageLoader final (no mocks left), neutral NewDraft
  log detail, snapshots are Etappe 4
- m-5: Tested up to 7.1, changelog completed
- m-6: content-create warns when the extras changed the stored layout
- m-7: deleting a whole section outlines nothing instead of the next one
- m-8: uninstall removes the user meta lit_mcp_log_per_page; readme lists it

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

@@ -23,10 +23,9 @@ defined('ABSPATH') || exit;
  * (ruling P16; a mismatch is rev_mismatch and nothing is written), let the ability change the
  * tree – only when its whole input validated (all or nothing) –, serialize, save via DiviSaver,
  * then lit_mcp_after_save, change log and the ToolResult with changed nodes, affected outline,
- * quality warnings (spec §5.5), revision_id, the new rev and tree_rev. Not final so abilities
- * can be tested with a mock.
+ * quality warnings (spec §5.5), revision_id, the new rev and tree_rev.
  */
-class DiviWriter
+final class DiviWriter
 {
     public const OUTLINE_TRUNCATED = 'Die Übersicht der geänderten Abschnitte ist gekürzt; vollständig mit '
         . 'lit-divi-outline lesen.';
@@ -89,6 +88,7 @@ class DiviWriter
                 ->rev(Rev::ofPost($post))
                 ->with('tree_rev', $page->treeRev())
                 ->warnings($change->warnings())
+                ->urls((string) get_preview_post_link($post), $page->editUrl())
                 ->toArray();
         }
 
@@ -143,7 +143,8 @@ class DiviWriter
     /**
      * Outline of the sections that contain changed nodes (breadth limit of ruling S18). A removed
      * node has no block any more, but its ID from before the removal still names the (surviving)
-     * section.
+     * section – unless the removed node was that section itself: its ID now names the next section,
+     * which did not change (review m-7).
      *
      * @return array{text: ?string, truncated: bool}
      */
@@ -152,7 +153,8 @@ class DiviWriter
         $sections = [];
         foreach ($change->entries() as $entry) {
             $id = DiviChange::idOf($entry, $index);
-            if ($id !== null) {
+            $wholeSection = $entry['block'] === null && $id !== null && ! str_contains($id, '.');
+            if ($id !== null && ! $wholeSection) {
                 $sections[explode('.', $id)[0]] = true;
             }
         }