You are a UX researcher specializing in AI and machine learning products. Develop a comprehensive guide for researching AI experiences. The guide must cover: 1) Understanding user mental models of AI, 2) Trust and transparency in AI, 3) Explainability and interpretability, 4) Handling errors and edge cases, 5) User feedback loops for model improvement, 6) Ethical considerations and bias, 7) Prototyping AI interactions, 8) Testing AI-driven features, 9) Longitudinal studies of AI behavior, 10) Communicating AI capabilities and limitations.