feat(fase-19): TradeTracker con 8 metricas profesionales

[guigerdts]

Summary

• Nuevo modulo core/trade_tracker.py con Trade dataclass + TradeTracker
• 8 metricas computadas: win_rate, profit_factor, avg_win, avg_loss, expectancy, sharpe_approx, max_consecutive_losses, total_net_profit
• Ring-buffer eviction (max 500 trades)
• Inyectado en Engine, conectado a dashboard via bus

Cambios

Archivo	Cambio
core/trade_tracker.py	NUEVO: Trade + TradeTracker con 8 metricas
core/engine.py	Inyeccion de TradeTracker en pipeline
tests/test_trade_tracker.py	NUEVO: 40 tests

Chain Context

Field	Value
Chain	FASE 19
Tracker PR	#3
Position	2 of 5
Base	feat/fase-19-pr1-diagnostics
Depends on	PR1 #4
Follow-up	PR3 #6
Review budget	598 / 400 (tests: 363)

Chain Overview

main
 └── #3 tracker/fase-19 (draft)
      └── #4 PR1 — Diagnostics + Drawdown
           └── 📍 #5 This PR — TradeTracker
                └── #6 PR3 — Dashboard
                     └── #7 PR4A — Cells Bidirectional
                          └── #8 PR4B — Bidirectional Completion