I have been considering blogging platforms long time ago. My criteria was different, but I care, as you do, about underlying tech stack, programming language and autonomy.

I have blogged about my blogging and these days I just use Markdeep with Fossil and Hypothesis for comments and annotations (as I'm doing here). I think this combination is working pretty fine for now and maybe I just automate the process here and there as needed.

By the way, I also like the self contained tech (I call them "pocket infrastructures": simple, self-contained, local first and extensible), but my exploration goes into dynamic languages and environments with Pharo (a Squeak fork) and I'm just putting Nim in my radar recently. I may try LittleStore. soon, as I see really aligned to my interests.