diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index 78f848c..cca79a1 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -109,7 +109,10 @@
     {
       "step": 13,
       "name": "element-definition-domain",
-      "status": "pending"
+      "status": "completed",
+      "summary": "RED: fesa_unit_tests failed with the expected missing element_definition.h and ownership APIs; GREEN/VERIFY: Domain now uniquely owns mixed ElementDefinition, ElementProperty, and Material bases with stable const views and move-only lifetime, focused ownership/AnalysisModel/mapper CTest passed 20/20, clang-format passed, full VS18 Debug build passed, CTest discovered 172 tests, and full CTest passed 172/172 including B33/MITC4 references.",
+      "started_at": "2026-08-16T08:48:18+0900",
+      "completed_at": "2026-08-16T09:10:38+0900"
     },
     {
       "step": 14,