Add a row_reduce primitive and migrate sum onto it (lesson 3, M3) - #124

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problem-jacobian-to-csrfrom

Commits on Sep 12, 2026

Add a row_reduce primitive and migrate sum onto it (lesson 3, M3)

dance858
and
claude
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8e1d2f8
row_reduce: review nits (bound_iwork doc, rule width, index names, includes)

dance858
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claude
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29ccaff
Keep the retired CSR row-sum kernels and tile_int under old-code

dance858
and
claude
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975676d
row_reduce: one position array in the sparse alloc instead of marker + col_to_pos

dance858
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claude
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52c90b1