chore(equation-and-linear-solve): step 0 output

phases/equation-and-linear-solve/index.json

@@ -5,7 +5,10 @@
     {
       "step": 0,
       "name": "symmetric-csr-assembly",
-      "status": "pending"
+      "status": "completed",
+      "started_at": "2026-07-31T15:19:35+0900",
+      "summary": "Added upper-triangle symmetric CSR types and deterministic serial Beam stiffness/load assembly with stable merge and regression tests.",
+      "completed_at": "2026-07-31T15:45:02+0900"
     },
     {
       "step": 1,
@@ -17,5 +20,6 @@
       "name": "pardiso-linear-solver",
       "status": "pending"
     }
-  ]
+  ],
+  "created_at": "2026-07-31T15:19:35+0900"
 }