New skill covering psychological principles and mental models: - Foundational Thinking (15 models) - Understanding Buyers (23 models) - Influencing Behavior (13 models) - Pricing Psychology (5 models) - Design and Delivery (10 models) - Growth and Scaling (8 models) Includes quick reference table matching challenges to models. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>