Fix research xp generation

tests/test_gold_mine_click.gd

@@ -6,10 +6,7 @@ var _game_root: Node = null
 
 func _ready():
     await run()
-    if failed == 0:
-        get_tree().quit(0)
-    else:
-        get_tree().quit(1)
+    # Don't quit here - let test_runner handle it
 
 func run():
     print("\n=== TEST: Gold Mine Click ===\n")