The circuit breaker (>20% drawdown) carried forward across epochs, permanently locking out all trades once triggered. With compounding portfolios, early drawdown in one epoch could produce zero rewards for all subsequent epochs (constant rewards bug). Fix: reset peak_value (high-water mark) at each epoch start. Capital still compounds (Bug #15 preserved), but drawdown is measured fresh per epoch. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>