diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index 8aa3d4b..50441e9 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -173,7 +173,10 @@
     {
       "step": 21,
       "name": "domain-mapper-modules",
-      "status": "pending"
+      "status": "completed",
+      "summary": "RED: fesa_unit_tests failed with expected MSVC C1083 missing private domain_builder.h; GREEN/VERIFY: topology, material/property, step/load/BC candidate seams and exact diagnostics passed focused CTest 17/17, domain_mapper.cpp now orchestrates private Status stages with atomic DomainBuilder commit, clang-format and full VS18 Debug build passed, and CTest discovery/full passed 197/197 including B33/MITC4 references.",
+      "started_at": "2026-08-16T11:33:08+0900",
+      "completed_at": "2026-08-16T11:45:33+0900"
     },
     {
       "step": 22,