Bumped azos-core, added sudo up-front to build

shells/defaultShell.nix

@@ -5,7 +5,18 @@ pkgs.mkShell {
     nh
     (pkgs.writeShellScriptBin
       "azos-lauretta-update"
-      "nh os switch '.?submodules=1#lauretta'")
+      ''
+        # Authenticate up front and keep the sudo timestamp fresh during the
+        # build, so nh's activation step doesn't prompt (and time out) at the end.
+        sudo -v || exit 1
+        while true; do
+          sleep 60
+          sudo -n -v 2>/dev/null || exit
+        done &
+        keepalive=$!
+        trap 'kill $keepalive 2>/dev/null' EXIT
+        nh os switch '.?submodules=1#lauretta'
+      '')
     (pkgs.writeShellScriptBin
       "azos-update-azos-core"
       "nix flake update --flake '.?submodules=1' azos-core")