[toreleon]

💡 What: Replaced sequential .reduce() passes over arrays like turnRows and equityRows with a single for loop in src/agent/backtestRunner.ts. Also replaced an object-accumulating .reduce() in src/tools/portfolio.ts with a for loop that updates local variables directly.

🎯 Why: Running multiple .reduce() passes traverses the same array multiple times (O(3N)), which adds significant iteration overhead on large arrays (like backtest turns). Similarly, accumulating into an object within a .reduce() causes unnecessary function instantiation and garbage collection overhead compared to a basic for loop with scalar mutations.

📊 Impact: Turns O(3N) multi-pass array iterations into O(N) operations in backtestRunner.ts. Reduces garbage collection pressure in portfolio.ts and backtestRunner.ts by avoiding object allocations and callback creation overhead during reductions.

🔬 Measurement: Run the test suite to ensure no regressions using pnpm test. Run a backtest using the TUI /backtest command to observe successful execution with lower memory allocation overhead.

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PR created automatically by Jules for task 17193101723706905739 started by @toreleon

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