Exclude link-checker config from the packaged gem (STF-557)

[oschwald]

Follow-up to the merged STF-557 PR: the gemspec packages Dir['**/*'] minus an exclusion list that didn't cover the link-checking config added in that PR, so lychee.toml/mise.toml/mise.lock (and .gitignore) were shipping in the published gem. Add them to the exclusion list.

This addresses @horgh's review note; the original STF-557 PR had already merged, so this is a separate PR.

Part of STF-557.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request updates the minfraud.gemspec file to exclude configuration and lock files (.gitignore, lychee.toml, mise.lock, mise.toml) from the packaged gem files. The review feedback points out that excluding .gitignore is redundant because Dir['**/*'] does not match hidden files by default. Additionally, it suggests filtering the file list to ensure only files (and not directories) are included in spec.files.

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[gemini-code-assist]

In Ruby, Dir['**/*'] does not match hidden files (dotfiles) like .gitignore by default because the File::FNM_DOTMATCH flag is not specified. Therefore, .gitignore is already excluded from the file list, making its inclusion in the .difference array redundant.

Additionally, Dir['**/*'] returns both files and directories. It is a good practice to filter out directories using File.file? to ensure only files are assigned to spec.files.

  spec.files = Dir['**/*'].select { |f| File.file?(f) }.difference(
    Dir['lychee.toml', 'mise.lock', 'mise.toml', 'CLAUDE.md', 'CODE_OF_CONDUCT.md',
        'dev-bin/**/*', 'Gemfile*', 'Rakefile', 'README.dev.md', 'spec/**/*', '*.gemspec']
  )