feat(scenes): add deterministic romantic cinema template

tests/unit/test_scene_composer_fast_path.py

@@ -701,6 +701,50 @@ def test_romantic_template_always_adds_authorized_decorative_lights() -> None:
     assert "ir:flash-close-00000000003" not in _peripheral_refs(observed[0])
 
 
+def test_romantic_cinema_template_keeps_native_base_and_adds_lights_without_model() -> None:
+    client = StructuredSceneClient()
+    assistant = CodexAssistantService(client)
+    template = _scene_template(
+        template_id="romantic-cinema",
+        name="浪漫影院模式",
+        aliases=["浪漫观影模式"],
+    )
+    observed: list[dict[str, object]] = []
+
+    def execute(
+        _instruction: str,
+        _progress: Callable[[dict[str, object]], None],
+        assistant_plan: Mapping[str, object],
+    ) -> dict[str, object]:
+        observed.append(deepcopy(dict(assistant_plan)))
+        return _preview_result("浪漫影院模式")
+
+    result, _events = _invoke(
+        assistant,
+        "创建浪漫影院模式",
+        execute,
+        conversation_id="conv-romantic-cinema-deterministic",
+        catalog=_catalog_with_templates(template),
+        scene_context=_scene_context_with_flashing_light(),
+    )
+
+    assert result["success"] is True
+    assert result["route"] == "scene_template"
+    assert client.structured_calls == []
+    assert client.legacy_calls == []
+    native_requests = [
+        request
+        for request in observed[0]["requests"]
+        if request.get("domain") != "self_extension"
+    ]
+    assert native_requests == template["plan"]["requests"]
+    assert _peripheral_refs(observed[0]) == [
+        "ir:flash-open-000000000001",
+        "ir:ambient-open-0000000001",
+        "ir:strip-open-000000000001",
+    ]
+
+
 def test_mid_autumn_cloud_composition_adds_required_native_and_external_controls() -> None:
     client = StructuredSceneClient()
     assistant = CodexAssistantService(client)