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/Content/PostPresenterTest.php

@@ -87,7 +87,8 @@ final class PostPresenterTest extends TestCase
         self::assertTrue($full['divi']);
         self::assertNull($full['content']);
         self::assertNull($full['featured_image']);
-        self::assertStringContainsString('lit-divi-outline', $full['hints'][0]);
+        self::assertStringNotContainsString('lit-divi', $full['hints'][0]);
+        self::assertStringContainsString('Divi-Werkzeuge folgen in einer späteren Version', $full['hints'][0]);
         self::assertInstanceOf(stdClass::class, $full['terms']);
         self::assertInstanceOf(stdClass::class, $full['fields']);
         self::assertSame(Rev::ofPost($post), $full['rev']);