Module schema 

Structs

BookDepth

Counterfactual

Fill

Observation

Market observation with deterministic embedding

Order

Order lifecycle tracking

OrderTimestamps

Pattern

PortfolioState

Provenance

Data provenance tracking

ReflexionTrace

ReasoningBank reflexion trace

Signal

Trading signal with causal links

StateAction

TradingAction

Verdict

Enums

ActionType

DecisionType

Direction

OrderSide

OrderStatus

OrderType

PatternType