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/Abilities/RevAndJsonMapTest.php

@@ -49,6 +49,31 @@ final class RevAndJsonMapTest extends TestCase
         self::assertFalse(Rev::matches(['rev' => 123], $post));
     }
 
+    public function testMenuRevCoversTheComparedFieldsOfEveryItem(): void
+    {
+        $item = static fn (array $overrides = []): object => (object) array_merge([
+            'ID' => 10,
+            'menu_item_parent' => '0',
+            'menu_order' => 1,
+            'title' => 'Start',
+            'url' => '/',
+            'object' => 'page',
+            'object_id' => '110',
+            'classes' => [''],
+        ], $overrides);
+        $rev = Rev::ofMenu([$item()]);
+
+        self::assertMatchesRegularExpression('/^[0-9a-f]{12}$/', $rev);
+        self::assertSame($rev, Rev::ofMenu([$item()]));
+        self::assertSame($rev, Rev::ofMenu([$item(['classes' => ['x']])]), 'not compared by menu-set-items');
+        self::assertNotSame($rev, Rev::ofMenu([]));
+        self::assertNotSame($rev, Rev::ofMenu([$item(), $item(['ID' => 11])]));
+        foreach (['ID' => 12, 'menu_item_parent' => '9', 'menu_order' => 2, 'title' => 'Home', 'url' => '/x',
+            'object' => 'post', 'object_id' => '111'] as $key => $value) {
+            self::assertNotSame($rev, Rev::ofMenu([$item([$key => $value])]), $key);
+        }
+    }
+
     public function testEmptyMapBecomesJsonObject(): void
     {
         self::assertInstanceOf(stdClass::class, JsonMap::of([]));