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* feat: implement Immutable pattern #3448 Add immutable/ module with ImmutableUser (final class, defensive copy, withAge wither method), App demo, JUnit 5 tests, PlantUML diagram, and README following project conventions. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat: add withName and withRoles wither methods to ImmutableUser #3448 Every field now has a corresponding wither for consistency. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix: add junit-jupiter-api dependency to immutable module #3448 Required for @Test annotations and assert methods in test code. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>