Remove legacy aliases, rename max_hours to max_minutes, collapse the four checkpoint save flags into save_every + save_latest, and change defaults to safer values (opponent_policy=self_play_league, device=auto, eval_every=50, max_depth=null). Migrate all archived yaml configs and tests to the new schema. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>