Replace Code Climate with Coveralls

[dblock]

Summary

• Replace simplecov gem with coveralls_reborn for code coverage reporting
• Update spec_helper.rb to use Coveralls instead of SimpleCov
• Migrate CI workflow from Code Climate to Coveralls integration
• Simplify coverage workflow by removing Code Climate setup and reporter steps

Test plan

• Add COVERALLS_REPO_TOKEN secret to GitHub repository settings
• Set up repository on https://coveralls.io
• Verify coverage workflow runs successfully and uploads to Coveralls
• Run bundle install locally to ensure coveralls_reborn gem installs correctly
• Run bundle exec rspec locally to verify tests still run with coverage

🤖 Generated with Claude Code

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