[mananaysiempre]

Dtach[1] does session persistence and nothing else—it leaves refreshing the screen to the program running inside it (it can send a ^L or a SIGWINCH upon reattaching but that’s it).

[1] https://dtach.sourceforge.net/

[simonmic]

+1 for dtach. That plus mosh and emacs works extremely well with no fuss.