Add matmul_all_scatter op to iris.ops#421

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copilot/introduce-gemm-allsscatter-ops

Commits on Mar 4, 2026

Commits on Mar 5, 2026

Rewrite matmul_all_scatter kernel to use direct iris.store scatter pattern from example 07

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Add iris.x.all_scatter primitive and use it in matmul_all_scatter; fix variable naming

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