I built 3 programmatic SEO sites for $25/month using Claude Haiku — here's the full architecture

Spent the past week running an experiment: can a programmatic SEO directory site survive Google's 2024 Helpful Content Update if every page is AI-generated? Rather than pick one niche and bet the farm, I built three parallel sites with the same stack - different content categories, identical architecture, single content generation pipeline. They share a monorepo, deploy independently to Vercel, and refresh nightly via one GitHub Actions cron. This post is the architecture write-up. I'll publish actual revenue/traffic numbers in a follow-up after 6 months.