wave8-ijobchunk-use-enabled-mask-guard

To iterate only enabled entities in Unity ECS IJobChunk, check the `useEnabledMask` flag and use a `ChunkEntityEnumerator` with the `chunkEnabledMask` to skip disabled entities when enableable component bitmasks are present.

Your IJobChunk processes disabled entities because it lacks the enabled mask guard. When a query includes IEnableableComponent types, you must use `useEnabledMask` and `ChunkEntityEnumerator` to respect per-entity enabled and disabled states.

You do not need to use `ChunkEntityEnumerator` when `useEnabledMask` is false. A fast path that loops over `chunk.Count` with a simple for loop avoids unnecessary mask overhead and yields better performance.

The best way to handle enabled masks is using IJobEntity, because it processes enableable masks automatically. You should only use the IJobChunk enabled mask guard with `ChunkEntityEnumerator` when IJobChunk is explicitly required.

You need to check `useEnabledMask` in Unity ECS chunk-based jobs whenever your entity query includes any IEnableableComponent. This ensures state-machine style simulations only update active, enabled entities and skip sleeping or dead variants.

You can use IJobChunk for state-machine simulations with enableable components by applying an enabled mask guard. This guard uses `useEnabledMask` and `ChunkEntityEnumerator` to ensure only active enabled entities receive simulation updates each frame.