Generate a detailed outline for a comprehensive founder succession plan, suitable for a 500-word article.  The outline should cover key aspects of preparing for and executing a smooth transition of ownership and leadership.  Include sections on identifying and developing potential successors, creating a formal succession plan document, establishing clear timelines and milestones, addressing financial implications (valuation, buy-out options, tax considerations), managing legal and regulatory compliance, and communicating the plan to stakeholders (employees, investors, family).  The outline should also consider different succession scenarios (e.g., sale to a third party, internal transfer, phased retirement) and address potential challenges and mitigation strategies.  The generated outline should be structured logically and include subheadings for each major section, ensuring a clear and concise flow of information.  The overall tone should be professional and practical, providing actionable steps and advice for founders.  The final output should be suitable for integration into a well-structured article aimed at business owners preparing for their eventual exit.