Implement retroactive module_function singleton copies#800
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Handles cursed
module_function :fooruntime behavior.Ruby doesn’t just mark
fooprivate — it snapshots the current method entry, installs a private instance copy, and exposes a public singleton copy. Also works whenfoocomes from an included module, because of course it does.This wires that up in resolution, tracks the generated copies so incremental reindexing can tear them down/rebuild them when the source method, visibility call, or ancestor chain changes, and covers the
attr_*edge cases too.