feat: add ProjectSource config-only node

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

project_loader.py

@@ -207,11 +207,37 @@ class ProjectLoaderDynamic:
         return (total_sequences,) + tuple(results)
 
 
+class ProjectSource:
+    """Config-only node — holds project connection settings, no outputs."""
+    @classmethod
+    def INPUT_TYPES(s):
+        return {
+            "required": {
+                "manager_url": ("STRING", {"default": "http://localhost:8080", "multiline": False}),
+                "project_name": ("STRING", {"default": "", "multiline": False}),
+                "file_name": ("STRING", {"default": "", "multiline": False}),
+                "sequence_number": ("INT", {"default": 1, "min": 1, "max": 9999}),
+                "label": ("STRING", {"default": "source", "multiline": False}),
+            },
+        }
+
+    RETURN_TYPES = ()
+    RETURN_NAMES = ()
+    FUNCTION = "hold_config"
+    CATEGORY = "utils/json/project"
+    OUTPUT_NODE = True
+
+    def hold_config(self, manager_url, project_name, file_name, sequence_number, label):
+        return ()
+
+
 # --- Mappings ---
 PROJECT_NODE_CLASS_MAPPINGS = {
     "ProjectLoaderDynamic": ProjectLoaderDynamic,
+    "ProjectSource": ProjectSource,
 }
 
 PROJECT_NODE_DISPLAY_NAME_MAPPINGS = {
     "ProjectLoaderDynamic": "Project Loader (Dynamic)",
+    "ProjectSource": "Project Source",
 }

tests/test_project_loader.py

@@ -203,6 +203,38 @@ class TestProjectLoaderDynamic:
         assert ProjectLoaderDynamic.CATEGORY == "utils/json/project"
 
 
+class TestProjectSource:
+    def test_input_types(self):
+        from project_loader import ProjectSource
+        inputs = ProjectSource.INPUT_TYPES()
+        assert "manager_url" in inputs["required"]
+        assert "project_name" in inputs["required"]
+        assert "file_name" in inputs["required"]
+        assert "sequence_number" in inputs["required"]
+        assert "label" in inputs["required"]
+
+    def test_no_outputs(self):
+        from project_loader import ProjectSource
+        assert ProjectSource.RETURN_TYPES == ()
+        assert ProjectSource.RETURN_NAMES == ()
+
+    def test_hold_config_returns_empty(self):
+        from project_loader import ProjectSource
+        node = ProjectSource()
+        result = node.hold_config(
+            manager_url="http://localhost:8080",
+            project_name="proj1",
+            file_name="batch_i2v",
+            sequence_number=1,
+            label="my_source"
+        )
+        assert result == ()
+
+    def test_category(self):
+        from project_loader import ProjectSource
+        assert ProjectSource.CATEGORY == "utils/json/project"
+
+
 class TestNodeMappings:
     def test_mappings_exist(self):
         from project_loader import PROJECT_NODE_CLASS_MAPPINGS, PROJECT_NODE_DISPLAY_NAME_MAPPINGS