hypercross 737136e2ef refactor: replace ForEach with Select iterators
Replace the delegate-based ForEach pattern with zero-allocation ref
struct Select iterators. This change moves iteration logic from
QueryExecutor to WorldQueryExtensions and introduces a new fluent
Query<T> API.

Other changes:
- Update singleton handling to use a dictionary instead of a reserved
  ID.
- Add IsSingleton flag to ComponentDescriptor.
- Replace QueryDescriptor with type-safe Query<T> structs.
- Update tests to use the new Select API.
2026-07-21 00:21:01 +08:00
2026-07-20 18:01:46 +08:00
2026-07-20 22:52:28 +08:00
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