andrey.bychkov 14e62a41bd Add Index access methods and validation functions to PIVector2D ...

- Add operator[], element(), and at() overloads for Index struct
- Add isValid() and isNotValid() methods to Index
- Add default initialization to -1 (invalid state)
- Add parameterized constructor Index(row, col)
- Add tests for new functionality

2026-02-27 00:41:51 +03:00

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