ISubsystem

ISubsystem defines a lifecycle interface for engine components that require explicit startup and shutdown phases.

class ISubsystem {
public:
  virtual ~ISubsystem() = default;

  virtual void start() = 0;
  virtual void stop() = 0;
};

Purpose

• Provide deterministic initialization and teardown hooks for stateful modules in the system.

Responsibilities

Method	Description
start	Called during engine bootstrapping.
stop	Called during shutdown or reset.

Notes

• Used by core modules like CandleAggregator, Strategy, ExecutionTracker, etc.
• Lifecycle is typically orchestrated by the engine or test harness.
• No assumptions about threading — start/stop are always externally coordinated.