Generic sparse arrays: CSC/CSR/COO formats, on-device conversions, SpMM/SpMV#745

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Commits on Jun 23, 2026

Add on-device `to_dense`; rename `sparse_from_dense` → `to_sparse`

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docs: restructure the sparse interface; document `to_sparse`/`to_dense`

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Add on-device sparse format conversions via `convert`

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Adopt generic sparse conversions in JLArrays

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Drop `sparse_coo_type`; test COO via `sparse_types`

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Test sparse matmul and conversions generically

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Allocate empty sparse arrays via spzeros/undef

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Convert sparse formats via coo_type/csr_type/csc_type hooks

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Only run the matmul accumulation test on GPU sparse formats

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