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3b0fd02b0f
Closes #1298 (test coverage for the API additions landed in #1391 plus the deferred view/masked_fill that arrived in the same merge window). Ten focused tests in TestTensorPyTorchCompat verify the methods students are most likely to call when porting PyTorch training loops to TinyTorch: - ndim matches len(shape) for rank 0-3 tensors - numel() equals .size - view() is a reshape alias, including -1 inference - contiguous() returns correct data and guarantees C-order layout - masked_fill basic replacement and the -inf attention-mask pattern - masked_fill does not mutate the original tensor - Tensor([t1, t2]) stacking constructor Each test targets one specific behavioral contract so failures pinpoint exactly which method regressed.