Four prop interfaces (FieldProps, TextFieldProps, ComboboxFieldProps, and the inline quartet in compose-field.ts own FieldSlotProps) each hand-typed the same label/description/errorMessage/necessityIndicator props with duplicate JSDoc. This makes all three consumer interfaces extend FieldSlotProps from compose-field.ts, so the slot interface and its runtime split travel together. The necessityIndicator default JSDoc moves to FieldSlotProps.