Let gem build load the gemspec

[skunkworker]

Summary

rake build and rake release fail on master. Both run gem build -V, and Rubygems cannot load the gemspec:

Invalid gemspec in [active_remote-cached.gemspec]: undefined local variable or method 'gem_files' for class Gem::Specification
ERROR:  Error loading gemspec. Aborting.

Rubygems evals the gemspec inside Gem::Specification. So the top-level def gem_files (from c130217) became an instance method on Gem::Specification, and the Gem::Specification.new block could not call it. The HOMEPAGE constant also went onto Gem::Specification.

Bundler evals the gemspec at the top level, so bundle install and rspec did not show the error.

Changes

• gem_files and homepage are now local variables. Locals work with both loaders. The file list logic does not change.
• A comment in the gemspec tells why it uses locals.
• New spec/gemspec_spec.rb. It loads the gemspec with Gem::Specification.load in a new Ruby process without Bundler, and calls validate. It must use a new process, because Bundler already loaded the gemspec in the rspec process.
• No version bump. VERSION stays 1.3.0.

Evidence

• The new spec fails on the old gemspec with the same gem_files error, and passes with this change.
• gem build -V active_remote-cached.gemspec succeeds.
• Gem::Specification.load and Bundler.load_gemspec give the same name, version, and file list.
• Full suite: 190 examples, 0 failures (Ruby 3.4.9, Rubygems 4.0.15). RuboCop: 19 files, no offenses.

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