ReadonlykindOptional ReadonlylabelAn override label shown for the variant (e.g. "Buy").
When absent, renderers derive a label from the variant name.
Optional ReadonlyskipWhen true, the variant's payload is hidden — only the label is rendered.
Useful for tuple payloads that have no per-field handle, or when the payload is purely structural.
Display metadata for an enum variant: its label and whether to hide its inner payload.