Update from code changes: custom llms.txt on authenticated sites

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Summary

Custom llms.txt and llms-full.txt files on authentication-enabled sites are now served to anonymous visitors when every page they link to or embed is public. If a custom file references any protected or group-restricted page, it stays behind authentication and anonymous visitors receive the automatically generated file. Deleting a custom file restores the generated file for all visitors. See the triggering change: https://github.com/mintlify/server/pull/7754

Changes

• Added a "Custom files on authenticated sites" section to the llms.txt page explaining the visibility rules (en, es, fr, zh)
• Updated the llms.txt row in the authentication feature availability table (en, es, fr, zh)
• Added a help center article for troubleshooting a custom llms.txt that anonymous visitors cannot see, with es/fr/zh translations and navigation entries in all languages
• Tightened the help center article's SEO description and aligned phrasing with existing docs style

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Note

Low Risk
Documentation-only updates with no application or auth logic changes.

Overview
Documents how custom llms.txt / llms-full.txt behave on sites with authentication: on each deploy, Mintlify scans linked or embedded pages; if every reference is public (public: true, no groups), anonymous visitors and AI tools get the custom file—otherwise they get the auto-generated index while signed-in users still get the custom file.

Adds Custom files on authenticated sites to the llms.txt guide (en, es, fr, zh), extends the partially authenticated row in the authentication feature table (including a fix for es/fr rows that previously misstated partial-auth behavior), and ships a new help center article with visibility rules and troubleshooting steps, registered in docs.json and locale nav configs.

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