simple_tensor.h

Explicit storage retention

std::move(tensor).RetainStorage() transfers owned buffers into a read-only shared view without copying payloads. Existing borrowed owners are reused and IOArena allocations acquire self-owning leases. Ownerless borrows and unleased execution-arena allocations are rejected. String tensors cannot be persistent and are always rejected, even when empty or already owned.

BorrowView() is a const, nonmutating operation: it copies only metadata and any existing owner token. Without such a token, the source must outlive the view. The pre-existing BorrowStrings and AsStrings APIs remain available for ordinary, nonpersistent execution; a borrowed string vector must outlive its view. These APIs never move storage out of a const tensor.

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