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

tests/Unit/Integrations/WordPress/Content/ContentCreateDiviTest.php

@@ -123,6 +123,46 @@ final class ContentCreateDiviTest extends TestCase
         self::assertArrayHasKey('divi', $this->ability(null)->inputSchema()['properties']);
     }
 
+    /**
+     * Review m-6: the extras are written after the layout; if that re-saves the entry (e.g. Pods
+     * object fields call wp_update_post, a save_post listener) and the layout changes, say so.
+     */
+    public function testALayoutChangedByTheExtrasIsReported(): void
+    {
+        $composer = $this->composer();
+        $composer->allows('write')->andReturn(['warnings' => [], 'outline' => 's0 divi/section']);
+        Functions\when('wp_insert_post')->justReturn(42);
+        $this->stubStoredDraft();
+        $writer = Mockery::mock(PostWriter::class);
+        $writer->allows('prepare')->andReturn(['fields' => [], 'terms' => [], 'warnings' => []]);
+        $writer->allows('postData')->andReturn(['post_title' => 'Start']);
+        $writer->allows('deniedMeta')->andReturn([]);
+        $writer->expects('writeExtras')->andReturnUsing(static function (): void {
+            Functions\when('get_post')->justReturn(new WP_Post([
+                'ID' => 42, 'post_title' => 'Start', 'post_type' => 'page', 'post_status' => 'draft',
+                'post_content' => '<!-- wp:divi/placeholder /-->',
+            ]));
+        });
+
+        $result = $this->ability($composer, $writer)->execute(self::INPUT + ['fields' => ['role' => 'x']]);
+
+        self::assertSame(Rev::of('<!-- wp:divi/placeholder /-->'), $result['tree_rev'], 'the stored state');
+        self::assertContains(ContentCreateAbility::LAYOUT_CHANGED, $result['warnings']);
+
+        $this->stubStoredDraft();
+        $unchanged = $this->ability($this->composerWriting(), $this->writer())->execute(self::INPUT);
+        self::assertNotContains(ContentCreateAbility::LAYOUT_CHANGED, $unchanged['warnings']);
+    }
+
+    /** @return ContentComposer&MockInterface */
+    private function composerWriting(): ContentComposer
+    {
+        $composer = $this->composer();
+        $composer->allows('write')->andReturn(['warnings' => [], 'outline' => null]);
+
+        return $composer;
+    }
+
     public function testWithoutDiviTheComposerIsNotUsed(): void
     {
         $composer = Mockery::mock(ContentComposer::class);

tests/Unit/Integrations/WordPress/Content/NewDraftTest.php

@@ -33,7 +33,7 @@ final class NewDraftTest extends TestCase
             self::assertSame(42, $e->postId);
             self::assertSame('Grund für den Client.', $e->reason);
             self::assertSame(
-                'Extras of new post 42 could not be written: layout kaputt; rollback: term 15 bleibt; '
+                'Writing new post 42 failed after the insert: layout kaputt; rollback: term 15 bleibt; '
                     . 'draft 42 could not be deleted: delete_post hook kaputt [rollback incomplete]',
                 $e->getMessage()
             );