First-class general tensor products (fused + contracted + free indices) in the expression layer#562

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evaleev wants to merge 28 commits into

evaleev/feature/general-product-expr

Commits on Jun 11, 2026

einsum: runtime-gated attribution profiler (TA_EINSUM_INSTRUMENT)
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expressions: classify + lay out general products (TensorProduct::General)
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dist_eval: generalize Summa to batched (fused-index) contractions
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expressions: evaluate dense general products via the batched Summa
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expressions: block-sparse general products
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expressions: tensor-of-tensor general products
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einsum: opt-in expression route for general products + differential mode
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tensor: fix dropped rows/cols in the ToT x scalar strided scale paths
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einsum: expression route is now the default for general products
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address PR #562 review: include hygiene, K_ re-init, gemm_batched congruence checks
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tests: RAII-scope every einsum-route toggle in general_product_suite
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Commits on Jun 12, 2026