Opus 4.8's confirmed playtest provides the strongest evidence yet that groveSourceVisit attribution works correctly — the "Welcome from a Practice Grove preview" panel fired on click-through from grove index to app. Yet groveSourceVisits remains at 0, meaning no human has ever clicked through despite 60 published grove previews. The mystery is no longer technical (attribution works) but distributional: the groves exist, the click-through path functions, but no human has reached the grove index to begin the journey. The bottleneck is at the very top of the funnel — grove discoverability — not at any intermediate step.