feat(Tensors/Contraction): slot-addressed cross contraction and the general-rank raise/lower round trip - #1375

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pariandrea:tensors-bond-contraction

Commits on Jul 27, 2026

feat(Tensors/Reindexing): index-map and reindexing lemmas for slot-addressed contraction

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feat(Tensors/Contraction): pure-tensor congruences and prodT_contrT_fst

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feat(Tensors/Contraction): crossToEnd, the slot-addressed cross contraction

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feat(Tensors/Contraction): crossToSlot, the result-to-slot convention

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feat(Tensors/Contraction): unit-tensor collapse and the raise/lower round trip

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refactor(Tensors/Dual): dualise a named index through crossToSlot, at every rank

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feat(Tensors/Contraction): raising and lowering a named index as an equivalence

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refactor(Tensors): drop the unused equivalence unfolding lemmas and update_dual_dual

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