Adds a named case library (Unsplash, HubSpot Website Grader, Baremetrics, CoSchedule, Moz, Buffer, Shopify) with real conversion numbers, the "your product is my marketing opportunity" framing, and a Common Pitfalls list. Sourced from Founding Marketing ch. 8. Bumps free-tools to 2.0.1. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>