⚡ Bolt: Use binary search for time-series lookups

[toreleon]

💡 What: Replaced Array.prototype.filter with a custom findLastBarIndex binary search function for time-based lookups on chronologically sorted market data arrays.
🎯 Why: In the backtesting hot loop (backtestRunner.ts), simulating historical data (priceOverride, vnindexAt) was previously scanning the entire time-series array via .filter(b => b.time <= asOf) on every single turn for every ticker. This resulted in O(N) array traversals and unnecessary array allocation in memory for every step of the backtest.
📊 Impact: Reduces simulation loop time complexity for data lookups from O(N) to O(log N) per turn, avoiding large object allocations entirely. This should make backtests spanning many tickers and periods noticeably faster.
🔬 Measurement: Run pnpm test (which executes tests/clock.test.ts to verify the clipping logic). Monitor standard backtest execution times before and after this change.

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PR created automatically by Jules for task 2207404779910620713 started by @toreleon

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