Reuse fighter animation scratch and output buffers across rollback frames.
Select air-collision hits in one pass without candidate allocations or sorting.
Index contiguous replay input frames directly and binary-search checksums.
Add regression tests for buffer reuse and replay lookup/validation.
## Summary
Fixes #20.
- Reuse fighter animation scratch and output buffers across rollback frames.
- Select air-collision hits in one pass without candidate allocations or sorting.
- Index contiguous replay input frames directly and binary-search checksums.
- Add regression tests for buffer reuse and replay lookup/validation.
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Summary
Fixes #20.