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/PostScheduleAbilityTest.php

@@ -54,6 +54,33 @@ final class PostScheduleAbilityTest extends TestCase
         self::assertStringContainsString('2099-06-01 09:30', $result['summary']);
     }
 
+    public function testWarnsThatAPrivatePostBecomesPublic(): void
+    {
+        Functions\when('get_post')->justReturn(new WP_Post(['ID' => 5, 'post_type' => 'post', 'post_title' => 'Intern', 'post_status' => 'private']));
+        Functions\when('wp_update_post')->justReturn(5);
+        Functions\when('get_post_status')->justReturn('future');
+        $log = Mockery::mock(ChangeLog::class);
+        $log->allows('record')->andReturn(4);
+
+        $result = $this->ability($log)->execute(['post_id' => 5, 'date' => '2099-06-01 09:30']);
+
+        self::assertCount(1, $result['warnings']);
+        self::assertStringContainsString('öffentlich', $result['warnings'][0]);
+        self::assertStringContainsString('2099-06-01 09:30', $result['warnings'][0]);
+    }
+
+    public function testADraftGetsNoPrivacyWarning(): void
+    {
+        Functions\when('wp_update_post')->justReturn(5);
+        Functions\when('get_post_status')->justReturn('future');
+        $log = Mockery::mock(ChangeLog::class);
+        $log->allows('record')->andReturn(4);
+
+        $result = $this->ability($log)->execute(['post_id' => 5, 'date' => '2099-06-01 09:30']);
+
+        self::assertSame([], $result['warnings']);
+    }
+
     public function testAHookThrowingDuringTheWriteIsAPartialWrite(): void
     {
         Functions\when('wp_update_post')->alias(static function (): void {
@@ -95,4 +122,18 @@ final class PostScheduleAbilityTest extends TestCase
         self::assertStringContainsString('Zukunft', $past->get_error_message());
         self::assertSame('lit_validation_failed', $impossible->get_error_code());
     }
+
+    public function testADateWithinTheNextMinuteIsRejectedBecauseWordPressWouldPublishAtOnce(): void
+    {
+        Functions\expect('wp_update_post')->never();
+        // The start of the next minute: always in the future, but at most 60 seconds away.
+        $soon = (new \DateTimeImmutable('@' . (intdiv(time(), 60) * 60 + 60)))
+            ->setTimezone(new DateTimeZone('Europe/Berlin'));
+        Functions\when('get_post_status')->justReturn('future');
+
+        $result = $this->ability(Mockery::mock(ChangeLog::class))
+            ->execute(['post_id' => 5, 'date' => $soon->format('Y-m-d H:i')]);
+
+        self::assertSame('lit_validation_failed', $result->get_error_code());
+    }
 }