test(compare): trace deterministic monthly seed progression

hwe/j_install.php

@@ -199,8 +199,16 @@ if($reserve_open){
     ]);
 }
 
-try{
-    Json::die(ResetHelper::buildScenario(
+try{
+    $installTime = TimeUtil::now();
+    if (getenv('REF_DETERMINISTIC_INSTALL_ENABLED') === '1') {
+        $comparisonInstallAt = getenv('REF_INSTALL_AT');
+        if (!is_string($comparisonInstallAt) || $comparisonInstallAt === '') {
+            throw new \RuntimeException('REF_INSTALL_AT is required for deterministic comparison install');
+        }
+        $installTime = (new \DateTimeImmutable($comparisonInstallAt))->format('Y-m-d H:i:s');
+    }
+    Json::die(ResetHelper::buildScenario(
         $turnterm,
         $sync,
         $scenario,
@@ -211,7 +219,7 @@ try{
         $show_img_level,
         !!$tournament_trig,
         $join_mode,
-        TimeUtil::now(),
+        $installTime,
         $autorun_user
     ));
 }
@@ -220,4 +228,4 @@ catch(\Exception $e){
         'result'=>false,
         'reason'=>$e->getMessage()
     ]);
-}
+}