- [#400](https://github.com/esengine/esengine/pull/400) [`d2af9ca`](https://github.com/esengine/esengine/commit/d2af9caae9d5620c5f690272ab80dc246e9b7e10) Thanks [@esengine](https://github.com/esengine)! - feat(behavior-tree): add pure BehaviorTreePlugin class for Cocos/Laya integration
- Added `BehaviorTreePlugin` class that only depends on `@esengine/ecs-framework`
- Implements `IPlugin` interface with `install()`, `uninstall()`, and `setupScene()` methods
- Removed `esengine/` subdirectory that incorrectly depended on `@esengine/engine-core`
- Updated package documentation with correct usage examples
Usage:
```typescript
import { Core, Scene } from '@esengine/ecs-framework';
import { BehaviorTreePlugin, BehaviorTreeBuilder, BehaviorTreeStarter } from '@esengine/behavior-tree';