Avoid shell variable collision in bench parser

scripts/bench-ubatch-rocmi4.sh

@@ -150,7 +150,7 @@ run_one() {
         echo "--- run ${r}/${runs} ---"
         python3 - "$ubatch" "$port" "$out_tokens" "$CTX" "$log" "$r" <<'PY'
 import sys, time, json, urllib.request
-ubatch, port, out_tokens, ctx, log, run = sys.argv[1], sys.argv[2], int(sys.argv[3]), int(sys.argv[4]), sys.argv[5], sys.argv[6]
+ubatch, port, out_tokens, ctx, log, run_number = sys.argv[1], sys.argv[2], int(sys.argv[3]), int(sys.argv[4]), sys.argv[5], sys.argv[6]
 
 # Flowing prose at ~75% of ctx so MTP acceptance is realistic.
 VAR = (
@@ -210,7 +210,7 @@ if evals and ct:
     if match:
         ms = float(match.group(1))
         g_tps = f"{ct / (ms / 1000):.2f}"
-print(f"== RESULT ubatch={ubatch} run={run} "
+print(f"== RESULT ubatch={ubatch} run={run_number} "
       f"PREFILL={grab(prefill)} GEN_TPS={g_tps} "
       f"pt={pt} ct={ct} wall={dt:.1f}s")
 PY