diff --git a/phases/linear-static-mitc4-shell/index.json b/phases/linear-static-mitc4-shell/index.json
index ce1f0a9..f097d34 100644
--- a/phases/linear-static-mitc4-shell/index.json
+++ b/phases/linear-static-mitc4-shell/index.json
@@ -37,7 +37,10 @@
     {
       "step": 4,
       "name": "mitc4-stiffness-drilling",
-      "status": "pending"
+      "status": "completed",
+      "summary": "RED MSVC unit build failed with C2039 on missing Mitc4Shell::stiffness; GREEN added K20=sum(Bbar^T*C5*Bbar*J*w), Kphys24=Tp^T*K20*Tp, kd=1e-3*min(R+) from the eight tangent-rotation diagonals only, and Kdrill24=Td^T*(kd*I4)*Td with deterministic nonfinite failure; focused 10/10 and full CTest 104/104 passed.",
+      "started_at": "2026-08-12T19:41:51+0900",
+      "completed_at": "2026-08-12T19:54:27+0900"
     },
     {
       "step": 5,