Harden summary_metrics parsing for None rows

example/summary_metrics.py

@@ -16,14 +16,19 @@ def parse_last_row(history_path: Path):
     rows = history_path.read_text(encoding="utf-8").strip().splitlines()
     if len(rows) < 2:
         return None
-    last = rows[-1].split(",")
-    if len(last) < 4:
-        return None
+    for line in reversed(rows[1:]):
+        parts = line.split(",")
+        if len(parts) < 4:
+            continue
+        try:
             return {
-        "avg_ks": float(last[1]),
-        "avg_jsd": float(last[2]),
-        "avg_lag1_diff": float(last[3]),
+                "avg_ks": float(parts[1]),
+                "avg_jsd": float(parts[2]),
+                "avg_lag1_diff": float(parts[3]),
             }
+        except Exception:
+            continue
+    return None
 
 
 def main():