Optionalextrinsic?: booleanSet when the section is sized by its container (e.g. a user-resized embed) rather than its intrinsic content, so the surface can fit its content to the box instead of sizing to it.
OptionalnodeId?: stringThe graph node this surface renders; see ArticleData.nodeId.
Surface data for section role (from StackSection). Sections always render inside a plank, so
attendableIdis part of the contract.