* feat: add session tracking and multi-leg spread backtesting
Add SessionTracker for trading session management: - Market hours detection (pre-open, trading, squareoff, post-close)
- Session boundary tracking with configurable timezone - Squareoff time support for intraday strategies - Session high/low/open price tracking
Add SpreadBacktest for multi-leg options strategies: - Support for straddles, strangles, vertical spreads, iron condors - Coordinated entry/exit across all legs - Net premium P&L calculation with max loss/target profit exits - Helper functions for common spread configurations
Extend StreamingMetrics for backtest integration: - Add equity and drawdown tracking (update_equity, current_drawdown_pct) - Add trade recording (record_trade, record_fees) - Add finalize() method to produce BacktestMetrics - Add with_initial_capital() constructor
Bump version to 0.2.0.
* chore: bump up version to 0.2.0
* feat: update version to 0.2.1 and add rolling min/max indicators
* fix: formatting
porcelaincode