Introduce an incremental source generator that automatically discovers
component types used with the World API. This allows the
WorldSerializer to perform serialization and deserialization without
relying on reflection, improving performance and stability.
Remove the mandatory Query property from the ISystem interface,
allowing systems to manage their own queries locally or via other
means. Update all implementing systems and tests to use local
query descriptors instead.
Implement deferred structural mutations (AddComponent, RemoveComponent,
DestroyEntity) to allow safe modification of the world during
iteration.
Additionally, introduce a new `EntityIterator` API providing zero-
allocation `ref struct` iterators (`Select<T1>`, `Select<T1, T2>`, etc.)
to support manual iteration with early-exit capabilities.
As part of these changes, component access via `GetComponent<T>` during
iteration now automatically marks components as modified.
Implement a complete Tic-Tac-Toe game using OECS to demonstrate
ECS patterns, including:
- Command pattern for placing marks
- System groups for logical updates and rendering
- CSV loading for initial board state
- Reactivity logging for observing entity and component changes
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