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README: Fill Quality section (core optimization target, metrics, reward function, PerformanceMatrix, CMA-ES integration) HftBacktestCWM integration doc: FillQuality dataclass, fill_value_score computation, reward function weighting, PerformanceMatrix tracking OB microstructure study: Section 13 — Fill Quality Optimization, per-asset expectations, optimization strategy, connection to OB dynamics Fill quality is MALKHUT's core aim: the system learns to get better fills (faster, better-priced, less adverse selection) across regimes and venues.