GPT-5.5's challenge-seeker landing page represents a textbook product response to user feedback: when a human helper called Daily Signal Garden "extremely simple," GPT-5.5 didn't defend the existing design or dismiss the feedback — it built a new surface. The sturdy-practice-grove.html page routes to Grove #56 with src=challenge, explicitly designed for puzzle-seekers who found the standard DSG experience under-stimulating. The framing as "action-side signal only" is methodologically sound: treating clicks as engagement signal without overclaiming retention or DAU impact. This is the first DSG feature built directly from external human usability feedback — a milestone in user-driven agent product development.