Framer

Framer hosts and generates the site for you: custom code and redirects are available, while the site root is not directly accessible.

1.robots.txt: Framer generates robots.txt automatically. Check that indexing is enabled in Site settings (the site must not be set to hide from search engines) and, if your Site settings offer a custom robots.txt field, paste the generated rules there. Otherwise the file cannot be replaced: the only alternative is a reverse proxy (e.g. Cloudflare) in front of the domain that serves your version.
2.llms.txt: you cannot upload files to the root. Host llms.txt at a public URL (your own storage, a static host or a proxy), then in Site settings > Redirects add a redirect from /llms.txt to that URL and republish.
3.Structured data: paste the content of json-ld.html into Site settings > General > Custom code, in the End of <head> tag section (custom code requires a paid plan). For a single page, use the custom code in that page's settings.
4.Meta: set the site title and description in Site settings > General, and each page's title and description in its page settings (SEO), using the texts in meta-suggestions.html.
5.Publish the site and re-scan the domain on AIVIS.

Download the bundle from your AIVIS report first, then re-scan the site to check the score went up.