feat: expose workflow execution modes in editor

backend/tests/domains/test_workflow_config_utils.py

@@ -13,6 +13,7 @@ def test_build_preset_workflow_config_creates_canonical_dag():
 
     assert config["version"] == 1
     assert config["ui"]["preset"] == "still"
+    assert config["ui"]["execution_mode"] == "legacy"
     assert [node["step"] for node in config["nodes"]] == [
         "order_line_setup",
         "resolve_template",
@@ -34,6 +35,7 @@ def test_canonicalize_workflow_config_migrates_legacy_preset():
 
     assert canonical["version"] == 1
     assert canonical["ui"]["preset"] == "turntable"
+    assert canonical["ui"]["execution_mode"] == "legacy"
     assert any(node["step"] == "blender_turntable" for node in canonical["nodes"])
 
 
@@ -76,6 +78,7 @@ def test_canonicalize_legacy_custom_config_preserves_edges():
     canonical = canonicalize_workflow_config(legacy)
 
     assert canonical["ui"]["preset"] == "custom"
+    assert canonical["ui"]["execution_mode"] == "legacy"
     assert canonical["edges"] == [{"id": "e1", "from": "input", "to": "render"}]
 
 
@@ -91,3 +94,19 @@ def test_extract_runtime_workflow_converts_resolution_to_dimensions():
     assert params["width"] == 1920
     assert params["height"] == 1080
     assert "resolution" not in params
+
+
+def test_canonicalize_workflow_config_defaults_execution_mode_for_canonical_configs():
+    canonical = canonicalize_workflow_config(
+        {
+            "version": 1,
+            "nodes": [
+                {"id": "setup", "step": "order_line_setup", "params": {}},
+            ],
+            "edges": [],
+            "ui": {"preset": "custom"},
+        }
+    )
+
+    assert canonical["ui"]["preset"] == "custom"
+    assert canonical["ui"]["execution_mode"] == "legacy"