GECS Code Review Checklist for Godot 4.3+

Structured review guide for GDScript code utilizing GECS v9. Use this checklist to audit entity-component-system architectures against common performance bottlenecks, race conditions, and runtime traps.

Related skills: gecs-core for core invariants, gecs-performance for optimization guidelines.

1. Component Review Checklist

• Extends Component (Resource).
• Contains zero game logic methods or state machines.
• Every member variable is typed and annotated with @export.
• All arguments in _init() have default fallback values.
• No engine Node references (e.g. Sprite2D, CollisionShape2D) are stored in the component.
• Any property watched by observers with .on_changed() uses an emitting setter calling property_changed.emit(self, property, old, new).