chore(2meet-data-optimizer): make the hardening branch pass PHPStan and PHPCS

- CI PHPStan (level 6, baseline for pre-existing debt) failed on 35 errors in
  code added on hardening/2.0: missing iterable value types (PHPDoc only), a
  redundant method_exists() in uninstall.php, and the new WP-CLI commands
  registered as array('Class', 'instanceMethod') — now array(new Class(), ...)
- Local runs had been masked by a PHPStan tmpDir shared with the act CI runner
  (cached container pointing at a removed phar); use a private tmpDir
- Verify: phpstan (private tmpDir) no errors, phpcs clean on changed files,
  phpunit Unit 658 OK; dev22 (running this branch) CLI post-status-sync /
  bridge-restore-native dry runs OK

includes/query/class-tmdo-post-query-router.php

@@ -353,8 +353,8 @@ class TMDO_Post_Query_Router {
 	/**
 	 * The status / date copy route for a routed query, or [] when it does not apply.
 	 *
-	 * @param \WP_Query                        $query  Current WP_Query.
-	 * @param array<string, array<int, array>> $routed Routed clauses keyed by post type.
+	 * @param \WP_Query                                       $query  Current WP_Query.
+	 * @param array<string, array<int, array<string, mixed>>> $routed Routed clauses keyed by post type.
 	 * @return array{post_type:string, group:string, statuses:string[], order:string}|array{}
 	 */
 	private static function copy_route( \WP_Query $query, array $routed ): array {