refactor(workflow): simplify edge configuration

backend/tests/test_brains.py

@@ -2393,7 +2393,6 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
                         "mode": "llm",
                         "priority": 10,
                         "condition": "需求已收集",
-                        "transitionSpeech": "正在为你结束流程",
                     },
                 }
             ],
@@ -2569,29 +2568,6 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
         self.assertTrue(call_end.ending)
         self.assertTrue(call_end.armed)
         self.assertTrue(any(getattr(frame, "text", "") == "感谢来电" for frame in queued))
-        transition_context_frames = [
-            frame
-            for frame in worker.frames
-            if isinstance(frame, LLMMessagesAppendFrame)
-            and frame.messages
-            == [
-                {
-                    "role": "system",
-                    "content": (
-                        f"{FIXED_SPEECH_CONTEXT_MARKER}\n正在为你结束流程"
-                    ),
-                }
-            ]
-        ]
-        self.assertTrue(transition_context_frames)
-        transition_events = [
-            frame.message
-            for frame in queued
-            if isinstance(frame, OutputTransportMessageUrgentFrame)
-            and frame.message.get("source") == "workflow-edge-transition"
-        ]
-        self.assertEqual(transition_events[0]["content"], "正在为你结束流程")
-        self.assertEqual(transition_events[0]["nodeId"], "end")
         assistant_transcripts = [
             frame.message.get("content")
             for frame in queued
@@ -2601,11 +2577,7 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
         ]
         self.assertEqual(
             assistant_transcripts,
-            ["正在为你结束流程", "感谢来电"],
-        )
-        self.assertIn(
-            "正在为你结束流程",
-            brain._store.values["system__conversation_history"],
+            ["感谢来电"],
         )
         self.assertIn(
             "感谢来电",

backend/tests/test_pipeline_events.py

@@ -64,7 +64,7 @@ class _Brain:
 
     async def on_client_ready(self):
         for content, timestamp in (
-            ("Start Edge 过渡语", "2026-07-14T10:00:00.200+00:00"),
+            ("Message 节点播报", "2026-07-14T10:00:00.200+00:00"),
             ("Agent 固定进入语", "2026-07-14T10:00:00.300+00:00"),
         ):
             await self.worker.queue_frame(
@@ -118,7 +118,7 @@ class PipelineEventTest(unittest.IsolatedAsyncioTestCase):
         ordered = sorted(transcripts, key=lambda message: message["timestamp"])
         self.assertEqual(
             [message["content"] for message in ordered],
-            ["助手开场白", "Start Edge 过渡语", "Agent 固定进入语"],
+            ["助手开场白", "Message 节点播报", "Agent 固定进入语"],
         )
         self.assertEqual(transcripts[0]["timestamp"], greeting_time)
         self.assertEqual(brain.prepared_greeting, "助手开场白")

backend/tests/test_workflow_v3.py

@@ -132,6 +132,17 @@ class WorkflowGraphTests(unittest.TestCase):
         self.assertEqual(cleaned_agent["data"]["entryMode"], "wait_user")
         self.assertNotIn("entrySpeech", cleaned_agent["data"])
 
+    def test_edge_speech_fields_are_removed(self):
+        graph = valid_graph()
+        graph["edges"][0]["data"]["transitionSpeech"] = "不再播放"
+        graph["edges"][1]["data"]["transition_speech"] = "旧字段也不再播放"
+
+        normalized = normalize_graph(graph)
+
+        for edge in normalized["edges"]:
+            self.assertNotIn("transitionSpeech", edge["data"])
+            self.assertNotIn("transition_speech", edge["data"])
+
     def test_action_defaults_preserve_legacy_result_assignment_behavior(self):
         graph = valid_graph()
         graph["nodes"].extend(