//! Entity-component-system foundations.
//!//! The ECS is introduced incrementally. Entity handles, the component type
//! contract, and entity lifetime tracking are defined before component storage.
modaccess;modcomponent;modentity;modstorage;modworld;pubuseaccess::{AccessMode, SystemAccess, SystemPlan};pubusecomponent::Component;pubuseentity::Entity;pubuseworld::{World, WorldError};