Add StiffInitDt: component-wise initial step size algorithm for all implicit solvers#3085

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ChrisRackauckas-Claude:cr/sundials-initdt

Commits on Mar 17, 2026

Replace Hairer-Wanner initdt with CVODE CVHin for deterministic solvers
ChrisRackauckas
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Fix backward integration, GPU compatibility, and Runic formatting in CVHin
ChrisRackauckas
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Always use order-dependent formula in CVHin, clamp to hub
ChrisRackauckas
committed