well you'll have to get a DD on board to do the work and zig isn't even in debian so that'd have to get there first and the person wanting the terminal probably doesn't want to maintain the programming language as well. So that probably means 2 DDs. Again, there is a non-normal distance here.
Perhaps if one was inclined, Nix can provide immediate resolution, since it can be installed and used on Debian and ghostty project provides convenient flake.
Granted I'm on NixOS, but took me grand total of 60 seconds to update config and 8 minutes of actually building on a slow machine.
It's uncommon for upstream to provide .deb packages. That's not really how it's supposed to work. The Debian community creates Debian packages. Upstream's job is only to avoid making the Debian community's job more difficult than necessary. Unfortunately due to the decisions made by various popular Linux projects (mainly an obscene obsession with dynamic linking), it's not really feasible for upstreams to provide GUI applications on Linux. I hope someday this can change, but realistically there's not enough effort being put towards this goal.