refactor: restore two-port concat backend schema

tests/test_concat_by_target_node.py

@@ -31,7 +31,7 @@ class TestConcatByTargetNode(unittest.TestCase):
         self.assertLessEqual(float(image.max().item()), 1.0)
         self.assertTrue(torch.allclose(mask, torch.zeros_like(mask)))
 
-    def test_new_port_names_are_accepted(self):
+    def test_legacy_port_names_are_accepted(self):
         image_a = self.make_image(width=2, height=2, value=0.2)
         image_b = self.make_image(width=1, height=2, value=0.8)
 

tests/test_concat_by_target_registration.py

@@ -41,10 +41,10 @@ class TestConcatByTargetRegistration(unittest.TestCase):
         self.assertEqual(required["background_value"][1]["default"], 0.0)
         self.assertEqual(required["multiple_of"][0], "INT")
         self.assertEqual(required["allow_batch_broadcast"][0], "BOOLEAN")
-        self.assertEqual(optional["image/mask_A"][0], "IMAGE,MASK")
-        self.assertEqual(optional["image/mask_B"][0], "IMAGE,MASK")
-        self.assertNotIn("a", optional)
-        self.assertNotIn("b", optional)
+        self.assertEqual(str(optional["a"][0]), "*")
+        self.assertEqual(str(optional["b"][0]), "*")
+        self.assertNotIn("image/mask_A", optional)
+        self.assertNotIn("image/mask_B", optional)
         self.assertNotIn("image_a", optional)
         self.assertNotIn("image_b", optional)
         self.assertNotIn("mask_a", optional)

utils/concat_by_target.py

@@ -16,11 +16,18 @@ TARGET_CHOICES = ["A", "B"]
 POSITION_CHOICES = ["top", "bottom", "left", "right"]
 RESIZE_MODE_CHOICES = ["keep_proportion", "stretch", "none"]
 ALIGN_CHOICES = ["start", "center", "end"]
-INPUT_DATA_CHOICES = "IMAGE,MASK"
 PORT_A_NAME = "image/mask_A"
 PORT_B_NAME = "image/mask_B"
 
 
+class AnyType(str):
+    def __ne__(self, other):  # pragma: no cover - exercised by ComfyUI type checks
+        return False
+
+
+ANY_TYPE = AnyType("*")
+
+
 def _require_torch():
     if torch is None or torch_nn_functional is None:
         raise RuntimeError("[LLS] torch is required for LLS Concat By Target.") from _TORCH_ERR
@@ -452,8 +459,8 @@ class LLSConcatByTarget:
                 "allow_batch_broadcast": ("BOOLEAN", {"default": True}),
             },
             "optional": {
-                PORT_A_NAME: (INPUT_DATA_CHOICES,),
-                PORT_B_NAME: (INPUT_DATA_CHOICES,),
+                "a": (ANY_TYPE,),
+                "b": (ANY_TYPE,),
             },
         }