test: preserve Dev verification contracts through Refactor APIs

tests/test_cpp_policy_contract.py

@@ -96,3 +96,19 @@ def test_p_style_002_msvc_targets_enable_standard_exception_unwinding():
         assert "/EHsc" in compile_options.group("body"), (
             f"{target} must enable standard C++ exception unwinding under MSVC"
         )
+
+
+    # The maintained solution uses the shared native property sheet; both paths
+    # must keep standard exception unwinding. Doxygen remains optional above.
+    import xml.etree.ElementTree as ET
+
+    ns = {"m": "http://schemas.microsoft.com/developer/msbuild/2003"}
+    props = ET.parse(ROOT / "msvc" / "Fesa.Common.props")
+    assert props.findtext(".//m:ExceptionHandling", namespaces=ns) == "Sync"
+    for target in ("fesa_solver", "fesa_cli", "fesa_unit_tests",
+                   "fesa_integration_tests", "fesa_reference_tests"):
+        project = ET.parse(ROOT / "msvc" / f"{target}.vcxproj")
+        imports = [item.attrib.get("Project") for item in project.findall("m:Import", ns)]
+        assert "Fesa.Common.props" in imports, target
+        overrides = project.findall(".//m:ExceptionHandling", ns)
+        assert all(item.text == "Sync" for item in overrides), target