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8ef77c3dfe
After flattening, lib/ holds both RubyGems and Bundler, so any dev binstub that puts the worktree lib/ on $LOAD_PATH now overlays the already-booted system RubyGems with the worktree one. bin/bundle hit this through the Bundler gemspec activation: the partial overlay mixed a worktree Gem with an older system Gem::ConfigFile, breaking native extension installs on Ruby 3.2/3.3 (undefined install_extension_in_lib) and corrupting spec names elsewhere. The same overlay breaks bin/rake, bin/ronn, bin/rubocop and bin/mdl, which unshift the worktree lib/ (or require it through rubygems_ext) but boot on the system RubyGems. On a host whose RubyGems differs from the worktree copy this double-loads files like rubygems/package and raises (undefined method `spec=' for class Gem::Package::Old). Route all of them through switch_rubygems, like bin/rspec and bin/test-unit already do, so they re-exec onto the worktree RubyGems before anything is loaded. Point the shared gem home job at the worktree copy too, since the dev binstub can no longer load a separately installed RubyGems, and the matrix is redundant for now. https://github.com/ruby/rubygems/commit/f50eb4216d