feat: make mode creation preview-only and cache-safe

tests/integration/test_mode_draft_parameter_matrix.py

@@ -1193,26 +1193,34 @@ MAXIMUM_SCENE_REQUESTS = (
     _scene_request("ambient_light.set_power", "vehicle", {"state": "off"}),
     _scene_request("interior_light.set_indoor_power", "vehicle", {"state": "off"}),
     _scene_request("interior_light.set_reading_power", "all", {"state": "off"}),
+    _scene_request("window.set_position", "rear_left", {"position_pct": 0}),
+    _scene_request("window.set_position", "rear_right", {"position_pct": 0}),
+    _scene_request("ambient_light.set_mode", "vehicle", {"mode": "romantic"}),
+    _scene_request("ambient_light.set_brightness_level", "vehicle", {"brightness_level": 2}),
+    _scene_request("ambient_light.set_color_index", "vehicle", {"color_index": 6}),
+    _scene_request("seat.set_heating", "passenger", {"state": "on", "level": 1}),
+    _scene_request("seat.set_backrest_recline", "passenger", {"position_pct": 45}),
+    _scene_request("seat.set_legrest_height", "passenger", {"position_pct": 35}),
 )
 
 
-def test_scene_request_limit_accepts_exactly_twelve_verified_actions(
+def test_scene_request_limit_accepts_exactly_twenty_verified_actions(
     mode_service: tuple[SeatDemoService, Path],
 ) -> None:
     service, user_root = mode_service
-    assert len(MAXIMUM_SCENE_REQUESTS) == MAX_PLAN_REQUESTS == 12
+    assert len(MAXIMUM_SCENE_REQUESTS) == MAX_PLAN_REQUESTS == 20
     result = _preview_without_hardware(
         service,
-        "构建一个十二动作模式",
-        conversation_id="conv-twelve-scene-actions",
+        "构建一个二十动作模式",
+        conversation_id="conv-twenty-scene-actions",
         assistant_plan=_scene_plan(*MAXIMUM_SCENE_REQUESTS),
     )
 
-    _assert_successful_preview(result, name="十二动作模式", operation_count=12)
+    _assert_successful_preview(result, name="二十动作模式", operation_count=20)
     assert not list(user_root.rglob("*.yaml"))
 
 
-def test_scene_request_limit_rejects_thirteen_before_any_hardware_or_persistence(
+def test_scene_request_limit_rejects_twenty_one_before_any_hardware_or_persistence(
     mode_service: tuple[SeatDemoService, Path],
 ) -> None:
     service, user_root = mode_service
@@ -1225,8 +1233,8 @@ def test_scene_request_limit_rejects_thirteen_before_any_hardware_or_persistence
     with pytest.raises(ValueError, match="too many requests"):
         _preview_without_hardware(
             service,
-            "构建一个十三动作模式",
-            conversation_id="conv-thirteen-scene-actions",
+            "构建一个二十一动作模式",
+            conversation_id="conv-twenty-one-scene-actions",
             assistant_plan=_scene_plan(*oversized),
         )
     assert not list(user_root.rglob("*.yaml"))