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Ensure your Ruby code meets the highest community standards for readability and maintainability. This skill provides expert guidance on writing idiomatic code, enforcing strict structural constraints like five-line method limits, and implementing a mandatory Test-Driven Development (TDD) workflow. It covers everything from naming conventions and collection handling to advanced patterns like service objects and duck typing, making it an essential companion for building robust Rails applications, gems, and standalone Ruby scripts while optimizing for developer happiness.