- Introduced `VersionDefaultDeprecatedConflict` exception to catch cases where a version is marked as both default and deprecated.
- Added `VersionMultipleDefaults` exception to handle scenarios where multiple versions are declared as default.
- Updated `Factory` and `DSL` classes to enforce these validations during version definition.
- Enhanced controller rescue clauses to handle these new exceptions and provide meaningful error messages.
- Expanded documentation and troubleshooting guides to outline the causes, solutions, and best practices for resolving these errors.

- Removed unnecessary `.to_s` call on `@version.version` during interpolation.
- Ensured cleaner code and improved readability in `VersionDefaultDeprecatedConflict` exception handling.

- Deleted `ConflictsDefaultDeprecatedTreaty` and `ConflictsMultipleDefaultsTreaty` classes, as they are no longer required for validation testing.
- These cases are now covered by enhanced exception handling and validation mechanisms introduced in recent updates.
- Simplified the codebase by removing redundant treaty definitions.