Align H3 ref runtime defaults with UI

tests/test_dumas_h3_longvideos.py

@@ -1,4 +1,5 @@
 import importlib
+import inspect
 import sys
 import types
 import unittest
@@ -375,6 +376,15 @@ class DumasH3LongVideosHelperTests(unittest.TestCase):
         for index in range(1, 10):
             self.assertIn(f"ref_image_{index}", optional)
 
+    def test_run_defaults_match_declared_ref_widget_defaults(self):
+        node = self.module.H3LongVideos()
+        optional = node.INPUT_TYPES()["optional"]
+        params = inspect.signature(node.run).parameters
+
+        self.assertEqual(params["ref_mode"].default, optional["ref_mode"][1]["default"])
+        self.assertEqual(params["ref_image_size"].default, optional["ref_image_size"][1]["default"])
+        self.assertEqual(params["ref_noise_aug"].default, optional["ref_noise_aug"][1]["default"])
+
     def test_node_appends_per_beat_list_outputs_without_reordering_existing_slots(self):
         self.assertEqual(
             self.module.H3LongVideos.RETURN_NAMES[-2:],