sequence takes a modifier source, and plot loses its postTransform
RuneConfig.sequence takes a literal ('numbered' | 'connected' | 'plain'), while sequenceDirection beside it takes { fromModifier, default } (packages/transform/src/types.ts). plot needs its sequence style keyed on its structure modifier, so it uses a postTransform (plugins/storytelling/src/config.ts), one of four left in the codebase. Giving sequence the same form deletes it (SPEC-147 Finding 1, implementation note 1).