cog

893e6317 - review: replace string tags with FieldKind enum, add Debug derives, remove redundant test assertion (#2874)

review: replace string tags with FieldKind enum, add Debug derives, remove redundant test assertion (#2874) Address code review feedback: - Replace &'static str magic strings with FieldKind enum so the compiler enforces exhaustive matching (removes silent _ => {} arms) - Add #[derive(Debug)] to FieldClassification and FieldKind - Remove duplicate curl assertion in string_input_url_not_coerced.txtar that was a copy-paste leftover (same input shape, wrong comment)