chore(deterministic-parallel-assembly): step 0 output

phases/deterministic-parallel-assembly/index.json

@@ -5,7 +5,10 @@
     {
       "step": 0,
       "name": "canonical-contribution-order",
-      "status": "pending"
+      "status": "completed",
+      "summary": "Added canonical MatrixContribution ordering and deterministic upper-triangle CSR merge with bitwise permutation, cancellation, signed-zero, and serial-oracle coverage.",
+      "started_at": "2026-08-01T22:17:55+0900",
+      "completed_at": "2026-08-01T23:06:21+0900"
     },
     {
       "step": 1,
@@ -17,5 +20,6 @@
       "name": "thread-count-determinism",
       "status": "pending"
     }
-  ]
+  ],
+  "created_at": "2026-08-01T22:17:55+0900"
 }