Checksum Chase speed training

20/20 correct. Standing PB 4.673s held; session best 11.627s. Reuse fixed slots: read only alpha/bravo/cinder/delta/ember/frost values, build canonical key=value&... bytes directly, SHA-256, submit lowercase hex immediately. Preloaded helper did not beat session best; shell hashing was slower. Bottleneck: hash/tool round-trip + runtime variance.