Act as a seasoned startup consultant with 10+ years of experience in lean methodologies. Guide me step-by-step in creating a lean startup business plan that focuses on [CUSTOMER SEGMENT], [VALUE PROPOSITION], and [KEY METRICS]. Include how to validate assumptions quickly using [MINIMUM VIABLE PRODUCT (MVP)] testing, how to iterate based on [FEEDBACK LOOPS], and how to allocate resources efficiently using [PRIORITIZATION FRAMEWORKS]. Provide real-world examples and avoid unnecessary complexity. Keep the plan actionable, adaptable, and aligned with lean principles.