chore(shell-surface-pressure-load): step 3 output

phases/shell-surface-pressure-load/index.json

@@ -21,7 +21,10 @@
     {
       "step": 3,
       "name": "evaluate-shell-pressure-kernel",
-      "status": "pending"
+      "status": "completed",
+      "started_at": "2026-09-01T14:05:23+0900",
+      "summary": "Added a validated reference/current four-node pressure evaluator with exact follower tangent and focused kernel tests.",
+      "completed_at": "2026-09-01T14:31:41+0900"
     },
     {
       "step": 4,
@@ -45,4 +48,4 @@
     }
   ],
   "created_at": "2026-09-01T01:29:29+0900"
-}
+}