A standalone repo (engine vendored as a submodule at the examples commit) that runs a head-to-head between the builder-adversary and builder-adversary-min example variants: same task, independent headless runs, both on Sonnet, with token counts. Includes the roman-numeral test problem and run-bench.sh. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>