Active roadmap items render their goal paragraph in the roll-up

The roadmap tool renders an item body’s first paragraph as the one-line description only for Backlog items (Main.firstNonHeadingParagraph is reached only from Main.appendBacklogLine and Main.appendBacklogAdocLine). Items at Spec and beyond, exactly the ones a reader most wants to evaluate, show only title, status and dates in the Active table of both the README.md roll-up and the published status board. Once item bodies lead with a goal paragraph written to stand alone (the goal-first body convention), rendering that paragraph for active items would let a reader judge every in-flight item from the roll-up without opening its file. The Active render is a five-column table in both formats, so the paragraph needs a column or a row continuation, and the checked-in adoc expectations move with it.