Integrate EPK into arthel build system

[magent-cryptograss]

Context

We built a standalone EPK at magent-cryptograss/rabbithole/epk/ as a static HTML file. It works but duplicates logic that already exists in arthel.

Current State

• EPK is ~120KB single HTML file with inline CSS/JS
• Show data was manually generated from YAML using a temp script (/tmp/parse_shows.cjs)
• 46 shows imported from src/data/shows/*.yaml
• Globe visualization, contact form, mailing list section
• Not part of any CI/CD pipeline

Goal

Rebuild EPK as a proper arthel template that:

• Uses existing YAML show data infrastructure
• Uses arthel's Nunjucks templating
• Gets built automatically by maybelle
• Lives at justinholmes.com/epk/ or similar

Technical Notes

• Globe uses globe.gl library
• Show data needs: lat/lng coords, title, venue, city, block, poster, ensemble, setlist
• Coordinate mapping exists in temp script, should move to arthel
• Form submission points to api.cryptograss.live (inquiry-notifier service)

Related

• PR Updates to Contribution or whatever #8 in rabbithole repo has current EPK state
• inquiry-notifier service in maybelle-config (not yet deployed)

Files to Reference

• /home/magent/workspace/rabbithole/epk/index.html - current EPK
• /tmp/parse_shows.cjs - YAML parsing script (temp)
• /home/magent/workspace/arthel/src/data/shows/*.yaml - source show data