Add Phase 2 foundation: regime classifier, strategy framework, WebSocket streamer
Phase 1 completion:
- Add DataStreamer for real-time Binance Futures WebSocket data (klines, mark price)
- Add DataValidator for candle validation and gap detection
- Add timeframes module with interval mappings
Phase 2 foundation:
- Add RegimeClassifier with ADX/ATR/Bollinger Band analysis
- Add Regime enum (TRENDING_UP/DOWN, RANGING, HIGH_VOLATILITY, UNCERTAIN)
- Add Strategy ABC defining generate_signal, get_stop_loss, parameters, suitable_regimes
- Add Signal dataclass and SignalType enum for strategy outputs
Testing:
- Add comprehensive test suites for all new modules
- 159 tests passing, 24 skipped (async WebSocket timing)
- 82% code coverage
Dependencies:
- Add pandas-stubs to dev dependencies for mypy compatibility
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