⚡ Bolt: Optimize time-series array filtering in backtester

[toreleon]

💡 What: Replaced O(n) array .filter() calls with O(log n) binary searches for time-series lookups in backtesting.
🎯 Why: Market data OHLCV bars are chronologically sorted. Iterating over the entire array for every single turn during backtesting using .filter() was an unnecessary O(n) performance bottleneck.
📊 Impact: Exponential reduction in computation complexity for historic time lookups (O(n) -> O(log n)). Significantly improves backtest loop execution speed.
🔬 Measurement: Verify tests still pass using pnpm test. The implementation uses a robust binary search utility findLastBarIndex which handles duplicate timestamps cleanly and falls back safely to empty returns when target time isn't found.

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PR created automatically by Jules for task 16818634885458068228 started by @toreleon

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