Zola?
I know I only talk about The Fall and running websites, but I may have found an SSG that meets a lot of my new CMS requirements:
✅ single executable (no dependencies)
✅ inbuilt external data fetching (for webmentions)
Plus:
✅ compiles quickly
✅ similar templating to Liquid: easy to migrate
I really like Kirby, but it is a lot of work moving to it.