diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index d665a14..78f848c 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -101,7 +101,10 @@
     {
       "step": 12,
       "name": "material-property-hierarchy",
-      "status": "pending"
+      "status": "completed",
+      "summary": "RED: fesa_unit_tests failed with expected C1083 missing material/property base headers; GREEN/VERIFY: checked Material/ElementProperty hierarchies, virtual base ownership, stable source/internal identity, exact current fields, and invalid rejection passed focused CTest 11/11, clang-format, VS18 Debug full build, CTest discovery 170, and full CTest 170/170 without Domain ownership or numerical/reference changes.",
+      "started_at": "2026-08-16T08:34:09+0900",
+      "completed_at": "2026-08-16T08:48:18+0900"
     },
     {
       "step": 13,