Add classical quadrature rule families (Phase 2)#4
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gvonness-apolitical merged 1 commit intomainfrom Feb 26, 2026
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Implement seven quadrature rule types using the Golub-Welsch algorithm (symmetric tridiagonal eigenvalue decomposition) for robust node/weight computation without Newton iteration convergence issues. New rules: Gauss-Jacobi, Gauss-Laguerre, Gauss-Hermite, Gauss-Chebyshev (Types I & II), Gauss-Lobatto, Gauss-Radau, and Clenshaw-Curtis. Shared golub_welsch module provides the QL eigenvalue solver and Radau modification used by four of the rule families. 98 unit tests + 21 doc tests all passing with zero clippy warnings.
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Summary
Test plan
cargo fmt --checkclean