remove validation simulate

public/userarea/validate_export.php

@@ -70,8 +70,6 @@ try {
         exit;
     }
 
-    $simulate = ($_ENV['SIMULATE_EXPORT_LIMS'] ?? env('SIMULATE_EXPORT_LIMS') ?? '') === 'true';
-
     // ── Prefetch all data in bulk ───────────────────────────────────────────
 
     $iddatadbList = array_column($rows, 'iddatadb');
@@ -97,21 +95,6 @@ try {
         $iddatadb = (int)$rowInfo['iddatadb'];
         $index = $rowInfo['index'];
 
-        // Simulation: every even iddatadb gets a fake matrice error
-        if ($simulate && $iddatadb % 2 === 0) {
-            $results[$index] = [
-                'valid' => false,
-                'iddatadb' => $iddatadb,
-                'errors' => [[
-                    'field'   => 'parts',
-                    'message' => 'Matrice mancante — il LIMS rifiuterà l\'esportazione. '
-                               . 'Part senza matrice: PART-001, PART-003. '
-                               . 'Aprire la sezione Parts e assegnare la matrice.',
-                ]],
-            ];
-            continue;
-        }
-
         // Build context for validators
         $ctx = [
             'parts' => $partsInfo[$iddatadb] ?? [],