Game balance and bots

Every game is played thousands of times headless by seeded bots before a person plays it. The sims measure the difficulty curve, whether skill matters, how soon the first win moment comes and whether the twist happens; a bands file says what "balanced" means; every balance number lives in one tuning file. This skill builds the harness once (src/core/game-balance/, test/sims/write-sim-report.ts), each game's bots, sims and bands, and the check that judges the numbers.

Rules that must hold