a2a-Market Order State Machine

Define the canonical order lifecycle and transition guard framework.

Current status: first-release scaffold for early protocol compatibility.

Scope

• Model order states from creation to completion/cancelation.
• Enforce legal transitions with guard checks and side effects.
• Integrate payment and reputation triggers into state changes.

Suggested Project Layout

• app/domain/order/order_state.py
• app/domain/order/order_aggregate.py
• app/application/usecases/transition_order.py
• app/application/services/order_event_publisher.py