feat: implement core ECS engine with RxJS observability

Initial implementation of an Entity-Component-System (ECS) featuring:
- Sparse set-based component storage for efficient access.
- Entity lifecycle management with generation-based recycling.
- Reactive query system using RxJS for change tracking.
- Batched event flushing to support frame-based updates.
- Type-safe component definitions via TypeScript inference.

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hypercross

2026-05-31 15:45:20 +08:00

commit 4ede2d7f3b

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