feat: add workflow action outcomes and tracing

backend/tests/test_workflow_v3.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import unittest
+from copy import deepcopy
 from types import SimpleNamespace
 
 from models import AssistantConfig, RuntimeModelResource
@@ -54,6 +55,26 @@ def valid_graph():
 
 
 class WorkflowGraphTests(unittest.TestCase):
+    def test_revision_pins_the_normalized_workflow_snapshot(self):
+        first = WorkflowEngine(valid_graph())
+        same_graph = deepcopy(valid_graph())
+        same_graph["settings"] = dict(reversed(list(same_graph["settings"].items())))
+        second = WorkflowEngine(same_graph)
+
+        self.assertEqual(first.revision, second.revision)
+        self.assertTrue(first.revision.startswith("sha256:"))
+
+        metadata = first.session_metadata()
+        first.graph["settings"]["globalPrompt"] = "运行时外部修改"
+        self.assertEqual(
+            metadata["workflow"]["snapshot"]["settings"]["globalPrompt"],
+            "服务 {{customer}}",
+        )
+
+        changed = valid_graph()
+        changed["settings"]["globalPrompt"] = "另一份配置"
+        self.assertNotEqual(first.revision, WorkflowEngine(changed).revision)
+
     def test_workflow_graph_owns_flat_vision_session_flag(self):
         graph = valid_graph()
         graph["settings"].update(