fix(nixos): install terminfo only for terminals in use

environment.enableAllTerminfo installs every terminal's terminfo, including rxvt-unicode, which no longer builds with GCC 16 (NixOS/nixpkgs#568896). Install just the terminals we use (alacritty, foot, ghostty, kitty) instead. This also makes the aarch64 jasper workaround unnecessary.

modules/nixos/base/ssh.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ lib, pkgs, ... }:
 {
   # Secure by default: firewall ON everywhere. Servers run the same shared
   # firewall (modules/nixos/base/networking/firewall.nix) as every other host,
@@ -18,7 +18,15 @@
     openFirewall = true;
   };
 
-  # Add terminfo database of all known terminals to the system profile.
+  # Terminfo entries for the terminals we actually use, so `$TERM` resolves on
+  # hosts we SSH into.  This replaces `environment.enableAllTerminfo`, which
+  # installs every terminal's terminfo — including rxvt-unicode, which currently
+  # fails to build with GCC 16 (https://github.com/NixOS/nixpkgs/issues/568896).
   # https://github.com/NixOS/nixpkgs/blob/nixos-26.05/nixos/modules/config/terminfo.nix
-  environment.enableAllTerminfo = true;
+  environment.systemPackages = [
+    pkgs.alacritty.terminfo
+    pkgs.foot.terminfo
+    pkgs.ghostty.terminfo
+    pkgs.kitty.terminfo
+  ];
 }

modules/nixos/server/server-aarch64.nix

@@ -1,6 +1,4 @@
 {
-  lib,
-  pkgs,
   mylib,
   ...
 }:
@@ -26,6 +24,4 @@
     (mylib.relativeToRoot "hardening/apparmor")
   ];
 
-  # Fix: jasper is marked as broken, refusing to evaluate.
-  environment.enableAllTerminfo = lib.mkForce false;
 }