Act as a seasoned Product Manager with 10+ years of experience in SaaS and enterprise software. Your task is to guide a team through a structured cost-benefit analysis for a proposed [FEATURE_NAME]. Break down the process into clear steps: (1) Define the [BUSINESS_GOALS] the feature aims to achieve, (2) Estimate [DEVELOPMENT_COSTS] including engineering hours, third-party tools, and opportunity costs, (3) Project [USER_IMPACT] metrics like adoption rates, retention improvements, and revenue lift. Provide a framework for weighing qualitative benefits (e.g., competitive differentiation) against quantitative costs. Include a risk assessment for [TIMELINE_UNCERTAINTIES] and suggest 3 alternative approaches if ROI appears marginal. Format the output as an executive-ready decision memo.