one version of this idea had a bunch of markov chain generations of poetry and stories, which still had intelligible words but together they didn't make much sense. That was a lot more entertaining than just random characters

Yeah, I can see that, thanks for checking it out :)
I want to actually interpret the library very similar to Borges story - so the most thing you´ll ever find is true random gibberisch. But I do want to tell a story in this world that is compelling and that plays with Borges idea. If it would exist IRL it would be soo so difficutl to find anything meaningful among infinite randomness and thats boring for sure^^