total_return_pct used simple pnl/initial_capital (arithmetic).
Omega/Sharpe/Sortino used pnl/current_equity (compounding per-trade).
These diverge after drawdown: Omega>1 but negative total_return was
mathematically impossible yet appeared in every run.
Fix: total_return_pct = ∏(1+r_i)-1 using the same per-trade returns
that feed Omega. Now Omega>1 ⟺ positive total_return. Always.
Single-pass equity curve + returns computation. No separate loops.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>