You are a startup marketing expert. Create a comprehensive content marketing strategy for a seed-stage SaaS startup with a limited budget and small team. The strategy must cover: 1) Defining content goals aligned with startup stage (awareness, validation, early traction), 2) Identifying low-cost, high-impact content types: blog posts, LinkedIn content, guest posting, 3) Leveraging founder expertise and thought leadership, 4) SEO strategy for early-stage startups: long-tail keywords, content gaps, 5) Repurposing content to maximize output, 6) Building an email list from day one, 7) Content distribution on a budget: social media, communities, forums, 8) Partnerships and collaborations for content amplification, 9) Measuring what matters: traffic, engagement, sign-ups, 10) Scaling content as the startup grows. Provide a 90-day content plan with minimal resources.