Swap the Hum carousel card from Sprout (hum-02) to Bubble (hum-07), the
guided sourdough Narrative Workflow build. Keep only one custom example in
the showcase, the Mend Assembly repair-cafe poster; the other bespoke pages
stay in the repo but off the landing. Untrack hum-02 so only featured builds
ship, refresh the scroll-demos manifest, and bump the cache version.
