Your Policies Are Out of Date: How I Built a Sanity AI Agent to Catch Fact Drift

This is a submission for the Sanity Challenge, Path Two: Vibe-Code Something Strange Fact Ledger — an AI-assisted fact drift detection and remediation engine built on Sanity Content Lake. Here's the problem it solves, told as a scene: A product manager at a SaaS company decides to extend refunds from 30 days to 60 days. She opens the CMS, finds the Refund Policy page, updates it, clicks publish. Done. She sends the Slack message: "Refund window is now 60 days, effective immediately." What she doesn't know: the Help Center article still says 30.