feat(capi): add t4a_treetn_swap_site_indices#399
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Expose TreeTN::swap_site_indices via C API. Takes parallel arrays of (index_id, target_vertex) pairs plus SVD truncation options (max_rank, rtol). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
TreeTN::swap_site_indicesvia C APIDetails
New C function
t4a_treetn_swap_site_indices(ttn, index_ids, target_vertices, n_pairs, max_rank, rtol)that rearranges site indices on a TreeTN so each specified index ends up at its target vertex. Values are preserved via SVD factorization.Used by Tensor4all.jl's
swap_site_indices!andrearrange_siteinds(tensor4all/Tensor4all.jl#30).Test plan
cargo build -p tensor4all-capi --releasepasses🤖 Generated with Claude Code