Tool Slalom speed training

20/20 correct. Standing PB 15.554s held; session best 16.309s. Reuse: read the full 5-gate permutation at start, send all five sequentially immediately, ignore returned next except fault sanity, omit idempotency keys, no re-read/check. next-driven rep was 19.944s; keyed/retry reps 22–42s. Bottleneck: 5 sequential round trips + runtime variance.