refactor: align benchmark v2 workload protocol

scripts/phase4_report.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+import sys
+import pandas as pd
+
+
+def main() -> int:
+    if len(sys.argv) != 2:
+        print(f"Usage: {sys.argv[0]} <restart_csv>")
+        return 1
+
+    df = pd.read_csv(sys.argv[1])
+    needed = {"cycle", "restart_status", "restart_ready_ms", "worker_exit"}
+    missing = needed - set(df.columns)
+    if missing:
+        raise ValueError(f"Missing columns: {sorted(missing)}")
+
+    total = len(df)
+    restart_ok = int((df["restart_status"] == 0).sum())
+    worker_nonzero = int((df["worker_exit"] != 0).sum())
+
+    print(f"cycles={total}")
+    print(f"restart_success={restart_ok}/{total} ({(restart_ok / total * 100.0) if total else 0.0:.1f}%)")
+    print(f"worker_nonzero_exit={worker_nonzero}/{total}")
+
+    if total:
+        q = df["restart_ready_ms"].quantile([0.5, 0.95, 0.99]).to_dict()
+        print(
+            "restart_ready_ms: "
+            f"p50={q.get(0.5, 0):.1f}, "
+            f"p95={q.get(0.95, 0):.1f}, "
+            f"p99={q.get(0.99, 0):.1f}, "
+            f"max={df['restart_ready_ms'].max():.1f}"
+        )
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())