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Refactor: Rename mutual_exclusion to mutually_exclusive and consolidate DSL validators

- Rename MutualExclusionValidator to MutuallyExclusiveValidator
- Rename mutual_exclusion_validator.rb to mutually_exclusive_validator.rb
- Consolidate group validator DSL methods using define_method
- Update validator key from mutual_exclusion: to mutually_exclusive:
- Update method signature to use keyword argument message:
- Update specs to match new naming convention

This change improves consistency between validator class names and DSL
method names, reduces code duplication, and improves maintainability.

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