Agent-Based Market Simulator & Strategy Validation Firewall
A from-scratch stock market where the price emerges from thousands of interacting trader-agents — paired with a statistical "firewall" that honestly tests whether a trading strategy has real edge. Across eight strategy families it found none (the correct answer for efficient markets); the one signal that survived is volatility forecasting, competitive with industry-standard models. Pure Python, ~350 tests, tamper-evident result logging.