LLM Core: agents.md & llms.txt

LLM Core is a Shopify App that helps ecommerce merchants prepare their store for AI search engines by generating agents.md files. The app allows merchants to configure brand safety, AI licensing, and custom rules directly from the app and sync to their theme in one click. Legacy llms.txt and llms-full.txt are retained for compatibility, while robots.txt controls 17 known bots. Everything stays as Liquid templates with no proxy or speed impact.