fixes for S4 generics and classes defined across packages#663

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x-package-s4-fixes

Commits on May 28, 2026

pass along the S4 registration environment to ensure discovery of old classes in the package context
lawremi
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get actual package for S4 generics, since generic@package when making existing functions generic, generic@package is the package of the original function
lawremi
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add test
lawremi
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