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/migration/class-tmdo-native-restorer.php

@@ -218,11 +218,11 @@ final class TMDO_Native_Restorer {
 	/**
 	 * Flat rows matching $where; post rows carry their post type as __post_type.
 	 *
-	 * @param string $entity_type Entity type.
-	 * @param string $table       Flat table.
-	 * @param string $id_col      Entity id column.
-	 * @param string $where       WHERE clause with placeholders.
-	 * @param array  $params      Placeholder values.
+	 * @param string            $entity_type Entity type.
+	 * @param string            $table       Flat table.
+	 * @param string            $id_col      Entity id column.
+	 * @param string            $where       WHERE clause with placeholders.
+	 * @param array<int, mixed> $params      Placeholder values.
 	 * @return array<int, array<string, mixed>>
 	 */
 	private static function fetch( string $entity_type, string $table, string $id_col, string $where, array $params ): array {
@@ -237,10 +237,10 @@ final class TMDO_Native_Restorer {
 	/**
 	 * Replace the native meta of the keys this group owns for each row.
 	 *
-	 * @param string                        $entity_type Entity type.
-	 * @param string                        $group       Group the rows come from.
-	 * @param TMDO_Entity_Adapter_Interface $adapter     Entity adapter.
-	 * @param array                         $rows        Flat rows.
+	 * @param string                           $entity_type Entity type.
+	 * @param string                           $group       Group the rows come from.
+	 * @param TMDO_Entity_Adapter_Interface    $adapter     Entity adapter.
+	 * @param array<int, array<string, mixed>> $rows        Flat rows.
 	 * @return int Native values written.
 	 */
 	private static function write_rows( string $entity_type, string $group, TMDO_Entity_Adapter_Interface $adapter, array $rows ): int {