Module strategy 

Strategy trait and engine context.

A strategy is a deterministic state machine. It receives Event values, reads current engine state through StrategyContext, and emits commands through that same context.

Lifecycle

on_start -> on_event / on_timer ... -> on_stop

Strategies should keep exchange I/O out of their implementation. Direct HTTP calls belong in exchange adapters.

Structs

TimerHandle

Timer registration result.

Traits

Strategy

The Strategy trait - what every strategy must implement.

StrategyContext

Strategy context - what strategies use to interact with the engine.