Refactor: Reorganize tests and move ActiveJob to Rails-compliant paths

[mensfeld]

This is a major reorganization that improves code structure and follows Rails conventions. Changes are atomic and must ship together.

Test Infrastructure Changes:

• Move unit tests from spec/shoryuken/ to spec/lib/shoryuken/ (mirrors lib/)
• Move Rails version gemfiles from gemfiles/ to spec/gemfiles/
• Remove Appraisal gem in favor of custom multi-version testing
• Update RSpec, Rake, and Renovate configurations for new structure

ActiveJob Adapter Changes:

• Move adapters to Rails-compliant paths: lib/active_job/queue_adapters/
• Extract JobWrapper to lib/shoryuken/active_job/job_wrapper.rb
• Update all requires and constant references
• Change JobWrapper constant: ActiveJob::QueueAdapters::ShoryukenAdapter::JobWrapper → Shoryuken::ActiveJob::JobWrapper
• Add Rails 8.1 compatibility (stopping? method for Continuations)

Configuration Updates:

• Enhanced SimpleCov configuration with groups and minimum coverage
• Updated zeitwerk ignore pattern for new ActiveJob location
• Add YARD documentation to configuration methods

This reorganization provides:

• Clearer code structure matching Rails conventions
• Better test organization mirroring lib/ structure
• Improved ActiveJob adapter discoverability
• Foundation for future enhancements

Breaking Changes:

• JobWrapper constant path changed (if users reference it directly)
• Test file locations changed (CI/tooling may need updates)
• Gemfile organization changed (Appraisal removed)

Test Results: 512 examples, 0 failures, 90.43% coverage

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/reorganize-tests-and-activejob

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