Agent Skills: polars-backtest

Backtest trading strategies with the polars-backtest library (Rust-powered Polars extension, Finlab-compatible). Use when the user asks about backtesting, portfolio simulation, trading strategy evaluation, stop loss/take profit simulation, rebalancing, migrating from finlab, or anything involving polars_backtest / df.bt. 使用 polars-backtest 回測交易策略。當使用者提到回測、投資組合模擬、策略績效評估、停損停利、再平衡、finlab 遷移或 polars_backtest 時使用。