jekyll/jekyll-seo-tag ? reverse-engineered prompt

Build me a Jekyll plugin that adds all the important SEO and social sharing metadata for a site automatically.

I want it to output a page title, description, canonical URL, next and previous links for paginated pages, JSON LD structured data, Open Graph tags, and Twitter card tags. It should work nicely out of the box for most Jekyll sites, with sensible defaults and not a ton of confusing settings. If the site has a title, description, URL, or author info, use that when available, and make sure the tags are clean and machine readable.

Please include a simple way to install and use it in a Jekyll theme, plus basic docs and tests so it is easy to maintain. Keep the implementation focused on best practices for search engines and social networks, and look up current docs online if you need to confirm any tag details.