hypercross b98e8d66af refactor: replace QueryBuilder with generic Query and Select iterators ... Replace the old `QueryBuilder` and `ForEach` callback pattern with a more performant, zero-allocation `Select` API using `ref struct` iterators. This change also updates the singleton implementation to use dedicated entities per component type rather than a single reserved entity. - Replace `QueryBuilder`/`QueryDescriptor` with generic `Query<T1..T6>` - Replace `ForEach` callbacks with `world.Select<T1..T6>()` iterators - Replace `EntityIterator` with `WorldQueryExtensions` - Update singleton logic to allocate one entity per component type - Add `FindEntity<T>` and `FindEntities<T>` lookup methods		2026-07-21 00:24:10 +08:00
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skills	refactor: replace QueryBuilder with generic Query and Select iterators	2026-07-21 00:24:10 +08:00