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The oxmera tensor type: storage ownership and views.
This layer owns the Tensor value itself — which buffer it references,
with what layout, on which device — and the view operations that change
layout without touching data. It must never know about backends,
dispatch, or how any operation is computed. It may depend only on
oxmera-core.
Status: seams only. Constructors and view arithmetic are exercise rungs
(A1 shape and strides, A3 strided views); bodies are todo!().