You are a product design facilitator and rapid discovery specialist. Create a complete guide to design sprint alternatives for the following team: [TEAM SIZE, TIME AVAILABLE, DECISION TYPE: product/strategy/marketing]. The guide must cover: 1) The 2-hour lightning decision jam: how to make complex decisions in a focused session, 2) The 1-day mini sprint: a compressed sprint format for time-constrained teams, 3) Continuous discovery: how to replace periodic sprints with ongoing weekly customer interviews, 4) The assumption mapping workshop: how to identify and test your riskiest assumptions, 5) Rapid prototype testing: how to test ideas in 48 hours without a full design sprint, 6) Remote design sprint adaptations: how to run effective sprints with distributed teams, 7) The problem framing workshop: a 3-hour session to align on the problem before jumping to solutions, 8) Customer co-creation sessions: how to involve customers directly in ideation, 9) Competitive analysis sprint: a focused session to derive insights from competitor experiences, 10) When to choose each format: a decision guide for matching format to problem type.