diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index 4959bbc..b950310 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -69,7 +69,10 @@
     {
       "step": 8,
       "name": "element-geometry-vector3",
-      "status": "pending"
+      "status": "completed",
+      "summary": "RED: C-DUP-001 typed array-to-Vector3 seam failed with expected MSVC C2440/C2676/C2039 errors; GREEN/VERIFY: exact rotated B33, MITC4 stiffness/recovery/patch, and warped-geometry regressions passed in focused CTest 44/44, the duplicate primitive scan found 0 definitions, clang-format passed, and the full MSVC Debug build and CTest 155/155 passed; element/model geometry now uses the shared Vector3 without changing public array or result contracts.",
+      "started_at": "2026-08-16T07:08:42+0900",
+      "completed_at": "2026-08-16T07:27:50+0900"
     },
     {
       "step": 9,