feat: deferred 1a items - menu_rev lock, lit_mcp_guides filter, warnings, schedule guard precision

Task 14 (rulings P17/P18, Q10):
- lit/menu-get returns menu_rev (Rev::ofMenu over id, parent, position,
  title, url, object, object_id); lit/menu-set-items requires it, refuses
  a stale one with rev_mismatch (hint: lit/menu-get) and returns the new
  menu_rev. Errors::revMismatch takes an optional message/hint.
- GuideRepository: filter lit_mcp_guides adds/overrides topics; invalid
  topic names and non-string content are ignored, files stay the default.
- lit/post-trash names front page, posts page and linking menus in the
  confirmation and as warnings; lit/menu-assign-location needs confirm
  to remove an assigned menu and names it; lit/post-schedule warns that
  a private entry becomes public; Divi hints no longer point to
  non-existing lit-divi-* tools.
- PostGuard::missedSchedule: 60 s publish window, zero GMT date falls
  back to get_gmt_from_date(post_date); post-schedule refuses dates
  within that window.
- write_failed after a clean rollback that keeps a revision/backup says
  "Die Aenderung wurde nicht gespeichert (... bleibt erhalten)" via the
  new state parameter (Errors::writeFailed / WriteFailed rolledBackState).
- wp-basis-smoke: menu_rev flow, unassign confirm, trash/menu and
  private-schedule warnings.

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

tests/Unit/Integrations/WordPress/Status/PostTrashAbilityTest.php

@@ -16,6 +16,19 @@ use WP_Post;
 
 final class PostTrashAbilityTest extends TestCase
 {
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->options([]);
+        Functions\when('wp_get_associated_nav_menu_items')->justReturn([]);
+    }
+
+    /** @param array<string, mixed> $options */
+    private function options(array $options): void
+    {
+        Functions\when('get_option')->alias(static fn (string $name, mixed $default = false) => $options[$name] ?? $default);
+    }
+
     private function ability(ChangeLog $log): PostTrashAbility
     {
         Functions\when('get_post')->justReturn(new WP_Post(['ID' => 5, 'post_type' => 'page', 'post_title' => 'Alt', 'post_status' => 'publish']));
@@ -93,6 +106,51 @@ final class PostTrashAbilityTest extends TestCase
         self::assertStringContainsString('bereits im Papierkorb', $result['summary']);
     }
 
+    public function testWarnsWhenTrashingTheFrontPageOrThePostsPage(): void
+    {
+        $this->options(['show_on_front' => 'page', 'page_on_front' => '5', 'page_for_posts' => '9']);
+        Functions\when('wp_trash_post')->justReturn(new WP_Post(['ID' => 5]));
+        $log = Mockery::mock(ChangeLog::class);
+        $log->allows('record')->andReturn(3);
+        $ability = $this->ability($log);
+
+        $confirm = $ability->execute(['post_id' => 5]);
+        $result = $ability->execute(['post_id' => 5, 'confirm' => true]);
+
+        self::assertStringContainsString('Startseite', $confirm->get_error_message());
+        self::assertCount(1, $result['warnings']);
+        self::assertStringContainsString('Startseite', $result['warnings'][0]);
+        self::assertTrue($result['ok']);
+
+        $this->options(['show_on_front' => 'page', 'page_on_front' => '9', 'page_for_posts' => '5']);
+        self::assertStringContainsString('Beitragsseite', $ability->execute(['post_id' => 5, 'confirm' => true])['warnings'][0]);
+
+        $this->options(['show_on_front' => 'posts', 'page_on_front' => '5']);
+        self::assertSame([], $ability->execute(['post_id' => 5, 'confirm' => true])['warnings']);
+    }
+
+    public function testWarnsAndNamesTheMenusThatLinkThePost(): void
+    {
+        Functions\when('wp_get_associated_nav_menu_items')->alias(
+            static fn (int $id, string $type): array => $id === 5 && $type === 'post_type' ? [40, 41] : []
+        );
+        Functions\when('wp_get_object_terms')->alias(
+            static fn (array $ids, string $taxonomy, array $args): array =>
+                $ids === [40, 41] && $taxonomy === 'nav_menu' && $args === ['fields' => 'names']
+                    ? ['Hauptmenü', 'Footer', 'Hauptmenü']
+                    : []
+        );
+        Functions\when('wp_trash_post')->justReturn(new WP_Post(['ID' => 5]));
+        $log = Mockery::mock(ChangeLog::class);
+        $log->allows('record')->andReturn(3);
+
+        $result = $this->ability($log)->execute(['post_id' => 5, 'confirm' => true]);
+
+        self::assertCount(1, $result['warnings']);
+        self::assertStringContainsString('"Hauptmenü", "Footer"', $result['warnings'][0]);
+        self::assertSame(1, substr_count($result['warnings'][0], 'Hauptmenü'));
+    }
+
     public function testIsDestructiveAndIndirect(): void
     {
         $ability = $this->ability(Mockery::mock(ChangeLog::class));