Act as a senior JavaScript developer with 5+ years of experience in building secure web applications. Create a detailed, step-by-step guide for developing a robust password generator in JavaScript. Include the following features: [LENGTH] (customizable password length between 8-64 characters), [CHARACTER_TYPES] (options to include uppercase, lowercase, numbers, and special characters), and [EXCLUSIONS] (ability to exclude ambiguous characters like 'l', '1', 'O', '0'). Ensure the code is modular, well-commented, and follows best practices for security and performance. Provide examples of how to integrate this into a web form and handle user input validation.