diff --git a/fitment/fitment_decision.php b/fitment/fitment_decision.php
index 5c96b29..1226e0e 100644
--- a/fitment/fitment_decision.php
+++ b/fitment/fitment_decision.php
@@ -1,4 +1,16 @@
 <?php
+declare(strict_types=1);
+
+// fitment_decision.php
+// Canonical fitment decision entrypoint
+
+require_once __DIR__ . '/fitment_bootstrap.php';
+
+if (defined('FITMENT_DECISION_LOADED')) {
+    return;
+}
+define('FITMENT_DECISION_LOADED', true);
+
 /************************************************************
  * Modern4WD Fitment Decision Endpoint (CANONICAL)
  * Authoritative decision layer (Rules 1–4)