If this shell was served for a share URL (/s/<slug>), this same URL serves HTML to browsers, the manifest for Accept: application/json or ?format=json, and raw content for Accept: text/markdown or ?format=md. Canonical endpoints: https://api.regest.xyz/share/<slug-from-this-URL> and https://api.regest.xyz/share/<slug-from-this-URL>/content. Agent instructions: https://regest.xyz/skill.md.