Build a web app where SaaS teams define their product features and user roles. When a new customer signs up, AI analyzes their signup data (role, company size, stated goals) and generates a personalized onboarding checklist with prioritized steps, estimated completion times, and links to relevant docs/videos. Include a progress tracker, celebratory milestones, in-app guidance tooltips, and analytics on where users get stuck. Allow dynamic checklist updates based on user behavior.