Fix build_dag_from_recipe to use correct Node API

- Use keyword arguments for Node constructor
- Pass inputs list to Node instead of calling non-existent add_edge
- Two-pass approach: create SOURCE nodes first, then resolve input
  names to content-addressed IDs for dependent nodes
- Properly set output node using resolved ID

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server.py

@@ -1333,27 +1333,33 @@ def build_dag_from_recipe(yaml_config: dict, user_inputs: dict[str, str], recipe
     from artdag import DAG, Node
 
     dag = DAG()
-    node_map = {}  # node_id -> Node
+    name_to_id = {}  # Map YAML node names to content-addressed IDs
 
     registry = yaml_config.get("registry", {})
     assets = registry.get("assets", {})
     effects = registry.get("effects", {})
     dag_config = yaml_config.get("dag", {})
     nodes = dag_config.get("nodes", [])
+    output_node = dag_config.get("output")
 
+    # First pass: create all nodes and map names to IDs
     for node_def in nodes:
-        node_id = node_def.get("id")
+        node_name = node_def.get("id")
         node_type = node_def.get("type")
         node_config = node_def.get("config", {})
-        input_ids = node_def.get("inputs", [])
 
         if node_type == "SOURCE":
             if node_config.get("input"):
                 # Variable input - use user-provided hash
-                content_hash = user_inputs.get(node_id)
+                content_hash = user_inputs.get(node_name)
                 if not content_hash:
-                    raise HTTPException(400, f"Missing input for node {node_id}")
+                    raise HTTPException(400, f"Missing input for node {node_name}")
-                node = Node(node_id, "SOURCE", {"content_hash": content_hash})
+                node = Node(
+                    node_type="SOURCE",
+                    config={"content_hash": content_hash},
+                    inputs=[],
+                    name=node_name
+                )
             else:
                 # Fixed input - use registry hash
                 asset_name = node_config.get("asset")
@@ -1361,24 +1367,53 @@ def build_dag_from_recipe(yaml_config: dict, user_inputs: dict[str, str], recipe
                 content_hash = asset_info.get("hash")
                 if not content_hash:
                     raise HTTPException(400, f"Asset {asset_name} not found in registry")
-                node = Node(node_id, "SOURCE", {"content_hash": content_hash})
+                node = Node(
-        elif node_type == "EFFECT":
+                    node_type="SOURCE",
+                    config={"content_hash": content_hash},
+                    inputs=[],
+                    name=node_name
+                )
+            name_to_id[node_name] = node.node_id
+            dag.add_node(node)
+
+    # Second pass: create nodes with inputs (now we can resolve input names to IDs)
+    for node_def in nodes:
+        node_name = node_def.get("id")
+        node_type = node_def.get("type")
+        node_config = node_def.get("config", {})
+        input_names = node_def.get("inputs", [])
+
+        # Skip SOURCE nodes (already added)
+        if node_type == "SOURCE":
+            continue
+
+        # Resolve input names to content-addressed IDs
+        input_ids = [name_to_id[name] for name in input_names if name in name_to_id]
+
+        if node_type == "EFFECT":
             effect_name = node_config.get("effect")
             effect_info = effects.get(effect_name, {})
             effect_hash = effect_info.get("hash")
-            node = Node(node_id, "EFFECT", {"effect": effect_name, "effect_hash": effect_hash})
+            node = Node(
+                node_type="EFFECT",
+                config={"effect": effect_name, "effect_hash": effect_hash},
+                inputs=input_ids,
+                name=node_name
+            )
         else:
-            node = Node(node_id, node_type, node_config)
+            node = Node(
+                node_type=node_type,
+                config=node_config,
+                inputs=input_ids,
+                name=node_name
+            )
 
-        node_map[node_id] = node
+        name_to_id[node_name] = node.node_id
         dag.add_node(node)
 
-    # Connect edges
+    # Set output node
-    for node_def in nodes:
+    if output_node and output_node in name_to_id:
-        node_id = node_def.get("id")
+        dag.set_output(name_to_id[output_node])
-        input_ids = node_def.get("inputs", [])
-        for input_id in input_ids:
-            dag.add_edge(input_id, node_id)
 
     return dag