fix

modules/home/ssh.nix

@@ -3,22 +3,27 @@
 
   home.packages = [ pkgs.openssh ];
 
+  programs.ssh = {
+    enable = true;
+    startAgent = true;
+    extraConfig = ''
+      Host *
+        AddKeysToAgent yes
+        IdentityFile ~/.ssh/id_ed25519
+    '';
+  };
+
   home.activation.generateSshKey = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
     key="$HOME/.ssh/id_ed25519"
     if [ ! -f "$key" ]; then
       umask 077
       mkdir -p "$HOME/.ssh"
-      ssh-keygen -t ed25519 -N "" -f "$key" -C "moons@$(hostnamectl --static 2>/dev/null || echo host)"
+      ${pkgs.openssh}/bin/ssh-keygen -t ed25519 -N "" -f "$key" \
+        -C "moons@$(hostnamectl --static 2>/dev/null || echo host)"
       echo "Generated SSH key at $key"
     fi
   '';
 
-  home.file.".ssh/config".text = ''
-    Host *
-      AddKeysToAgent yes
-      IdentityFile ~/.ssh/id_ed25519
-  '';
-
   programs.git = {
     enable = true;