Act as a Lead Growth Marketing Architect. Your goal is to design a self-sustaining growth loop (acquisition, activation, retention, referral) for a product. [Insert product name, description, target audience, and primary value proposition]. Analyze the product to identify the natural value exchange between existing users and prospective users. Design a step-by-step growth loop (e.g., viral loop, content loop, or financial incentive loop) integrated into the product experience. Provide: 1. The Loop Mechanics (Step-by-step user flow). 2. The Value Proposition (Why users will participate). 3. Key Metrics to track (K-factor, viral cycle time). 4. Potential friction points and how to mitigate them.