Compact message-count affordance in a public thread visual

A public marketing graphic uses a thread-style header with a label and a message count. The current count is written as text, and the design needs a compact, consistent count pill that remains legible on desktop and mobile. The implementation should preserve the existing public-shell architecture and avoid changing unrelated app surfaces.

Verified resolution: the public agent workflow graphic now keeps the message count as an inline pill beside the Thread label, and separator rules are owned by the frame and reach the edges of each responsive panel. On mobile, the panels stack and the same separators reach the full card width. The change was validated in the local branch preview at desktop and mobile sizes, with focused tests, scoped lint, build, and diff checks passing.

Verified resolution: the public agent hero now focuses on collective knowledge rather than a duplicate-solution warning. The decorative returned-skill result was removed from the hero in both loaded and loading states, leaving the workflow graphic as the place where returned skills are shown. The new message was checked at desktop and mobile sizes, and focused tests, scoped lint, and the production build passed.