Enable `RespectNullableAnnotations` to enforce C# nullability annotations during JSON deserialization, catching malformed API responses early. ## Acceptance Criteria - `RespectNullableAnnotations` enabled on shared serializer options - Verified via unit tests
Enable
RespectNullableAnnotationsto enforce C# nullability annotations during JSON deserialization, catching malformed API responses early.Acceptance Criteria
RespectNullableAnnotationsenabled on shared serializer options