chore(linear-static-mitc4-shell): retry fixed tolerance step

phases/index.json

@@ -6,8 +6,7 @@
     },
     {
       "dir": "linear-static-mitc4-shell",
-      "status": "error",
-      "failed_at": "2026-08-13T01:08:22+0900"
+      "status": "pending"
     }
   ]
-}
+}

phases/linear-static-mitc4-shell/index.json

@@ -109,11 +109,9 @@
     {
       "step": 13,
       "name": "shell-reference-comparison",
-      "status": "error",
-      "error_message": "[3회 시도 후 실패] [3회 수정 시도 후 실패] reference-comparison: exact hashes and required MSVC dependency paths pass; MITC4 comparator contracts pass 6/6, S4 metadata E2E passes, and independent E2E JSON reports are byte-identical, but the declared S4 blocking comparison fails all 25 nonzero U3 rows. Worst row Part-1-1/node 2/U3 has absolute error 1.90378534915144e-7 versus approved tolerance 1.0237408203e-9 (normalized 185.9636). The mismatch is already present in authoritative solver HDF5, while Step 13 owns only the test reference module and forbids solver production or tolerance changes; hand off to Correction/Coordinator for the prior MITC4 numerical kernel/stiffness path or upstream acceptance-contract review.",
-      "started_at": "2026-08-12T21:54:14+0900",
-      "failed_at": "2026-08-13T01:08:22+0900"
+      "status": "pending",
+      "started_at": "2026-08-12T21:54:14+0900"
     }
   ],
   "created_at": "2026-08-12T17:50:02+0900"
-}
+}