diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index ed9ddc9..bec79ab 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -45,7 +45,10 @@
     {
       "step": 5,
       "name": "solver-workflow-google-style",
-      "status": "pending"
+      "status": "completed",
+      "summary": "RED: current analysis_model_test.cpp against Step 4 HEAD headers failed with expected MSVC C1083 missing fesa/analysis/analysis_model.h; GREEN/VERIFY: VS18 x64 Debug focused build, focused CTest 57/57, clang-format 31/31, full build, CTest discovery 144, and full CTest 144/144 passed; solver workflow headers/APIs/callsites now use .h guards, PascalCase, and production-only Doxygen while preserving lifecycle, deterministic assembly, full residual, 0x0 Kff, and atomic state contracts.",
+      "started_at": "2026-08-16T05:37:40+0900",
+      "completed_at": "2026-08-16T06:20:08+0900"
     },
     {
       "step": 6,