bevy-ecs-patternslisted

# Bevy ECS Patterns Advanced patterns and techniques for Bevy's Entity Component System, focusing on performance, maintainability, and complex game architectures. ## When to Use This Skill | Use this skill when... | Use bevy-game-engine instead when... | |------------------------|--------------------------------------| | Optimizing ECS query performance | Setting up a new Bevy project from scratch | | Implementing complex entity relationships or hierarchies | Learning basic ECS concepts (components, systems, resources) | | Designing system scheduling and ordering | Handling input, assets, or game states | | Using change detection (`Changed<T>`, `Added<T>`) | Writing basic game logic or app structure | | Working with `ParamSet`, parallel iteration, or batch operations | Configuring rendering, UI, or audio | | Debugging archetype fragmentation or storage strategies | Adding plugins or common Bevy dependencies | ## Core Expertise **Advanced Queries** - Complex query filters and combinations - Query state and caching - Entity relationships and hierarchies - Parallel iteration strategies **System Scheduling** - System ordering and dependencies - Run conditions and gating - System sets and scheduling - Fixed timestep systems **Change Detection** - `Changed<T>` and `Added<T>` filters - `Ref<T>` for change tracking - Efficient reactive systems ## Advanced Query Patterns **Query Filters** ```rust use bevy::prelude::*; // Multiple filters fn targeting_system( query: Query