test(mcp): Separate generic C++ mocks from real gencpp samples

tests/test_ts_cpp_tools.py

@@ -70,7 +70,7 @@ void templateFunc(T t) {
  finally:
   mcp_client._resolve_and_check = original_resolve
 
-def test_exhaustive_gencpp_corpus():
+def test_exhaustive_cpp_samples():
  base_dir = Path(__file__).parent / "assets" / "cpp_samples"
  files_to_test = {
   "base_component.h": [