fix(llm): support Volcengine Coding model aliases (#411)

* fix(llm): support Volcengine Coding model aliases

* refactor(llm): add Volcengine Coding provider

* style: format Volcengine Coding test

tests/test_context_window.py

@@ -202,3 +202,8 @@ def test_lookup_is_case_insensitive():
     # GLM-5 capitalized variant
     glm = SimpleNamespace(model_name="Pro/zai-org/GLM-5", profile=None)
     assert get_context_window(glm) == 203_000
+
+
+def test_volcengine_glm_5_2_alias_keeps_exact_context_window():
+    model = SimpleNamespace(model_name="glm-5-2", profile=None)
+    assert get_context_window(model) == 1_000_000

tests/test_llm.py

@@ -41,6 +41,7 @@ class TestModelsRegistry:
         assert "zhipu" in providers
         assert "zhipu-code" in providers
         assert "volcengine" in providers
+        assert "volcengine-code" in providers
         assert "dashscope" in providers
         assert "dashscope-code" in providers
         assert "deepseek" in providers
@@ -62,6 +63,7 @@ class TestModelsRegistry:
             "zhipu",
             "zhipu-code",
             "volcengine",
+            "volcengine-code",
             "dashscope",
             "dashscope-code",
             "custom-openai",
@@ -1128,6 +1130,28 @@ class TestThirdPartyRouting:
         assert call_kwargs["base_url"] == "https://ark.cn-beijing.volces.com/api/v3"
         assert call_kwargs["api_key"] == "ve-key-123"
 
+    @pytest.mark.parametrize(
+        ("configured_model", "api_model"),
+        [("glm-5.2", "glm-5-2"), ("kimi-k2.5", "kimi-k2-5")],
+    )
+    @patch("EvoScientist.llm.models.init_chat_model")
+    def test_volcengine_code_routes_through_openai(
+        self, mock_init, configured_model, api_model, monkeypatch
+    ):
+        """Volcengine Coding Plan uses its endpoint, IDs, and vendor API key."""
+        mock_init.return_value = "mock_model"
+        monkeypatch.setenv("VOLCENGINE_API_KEY", "ve-code-key-123")
+
+        get_chat_model(configured_model, provider="volcengine-code")
+
+        call_kwargs = mock_init.call_args[1]
+        assert call_kwargs["model_provider"] == "openai"
+        assert call_kwargs["model"] == api_model
+        assert (
+            call_kwargs["base_url"] == "https://ark.cn-beijing.volces.com/api/coding/v3"
+        )
+        assert call_kwargs["api_key"] == "ve-code-key-123"
+
     @patch("EvoScientist.llm.models.init_chat_model")
     def test_dashscope_routes_through_openai(self, mock_init, monkeypatch):
         """DashScope provider should route through OpenAI with correct base_url."""