Add NordsieckBDF and DNordsieckBDF: Newton-based Nordsieck BDF solvers - #4017

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Commits on Jul 25, 2026

Add NordsieckBDF and DNordsieckBDF: Newton-based Nordsieck BDF solvers

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Test NordsieckBDF against the NonlinearSolveAlg corrector

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NordsieckBDF: optional STALD, order reduction on repeated corrector failures

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Commits on Jul 26, 2026

Refactor NordsieckBDF into the package's conventional file layout

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Commits on Aug 2, 2026

Fix CI: declare the Rosenbrock test dep, rename the `indx_acor` typo

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