fix: never publish a missed schedule, refuse trashed posts, fail on meta read errors

- PostGuard::editable() refuses trashed entries unless the caller opts in
  (content-get, revisions-list, post-trash); publish/schedule/unpublish/update/
  restore/duplicate/replace now refuse them.
- PostGuard::statusStable(): content-update, revision-restore and
  replace-with-copy refuse a future post whose date has passed (any save would
  publish it); the content-update rollback and PostCloner row writes re-check.
- PostCloner::ownMeta() treats a failed SELECT as an error; replace() reads the
  copy before its first write.
- replace-with-copy needs create_posts (backup clone) and reports backup_id in
  write_failed/partial_write.

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

tests/Unit/Abilities/WriteFailedTest.php

@@ -46,4 +46,13 @@ final class WriteFailedTest extends TestCase
         self::assertSame('Mit lit-menu-get prüfen.', $error->get_error_data()['hint']);
         self::assertSame(3, $error->get_error_data()['menu_id']);
     }
+
+    public function testCleanRollbackKeepsItsDetails(): void
+    {
+        $error = (new WriteFailed('Nicht übernommen.', true, details: ['backup_id' => 88]))->toError();
+
+        self::assertSame('lit_write_failed', $error->get_error_code());
+        self::assertSame(88, $error->get_error_data()['backup_id']);
+        self::assertStringContainsString('"backup_id":88', $error->get_error_message());
+    }
 }