Add `description` in custom attributes CRUD API response

Editor assessment

The subject states a concrete API change, a description field added to the custom attributes CRUD response, and the backticked field name is precise. Chore is a doubtful type for expanding an API payload where feat fits better, though the straddle is arguable since the field may be additive plumbing. No scope, no body explaining who consumes the description or how it is set, the contract detail that would make the change useful. The trailing pull-request number is conventional. Hygiene otherwise fine. Understandable, valid, miscast, and thin.