MCMC proposal bug-fixes and small refactor#448

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orad/audit-fix-1

Commits on Jul 21, 2026

proposals for individual MCMC methods, shared asymmetric transition logic
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MCMC now creates the markov kernel, not the individual proposal and transition density
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Commits on Jul 23, 2026

scale Barker kernel by step-sizecorrectly for robustness
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