Add shell configuration for endurance

home/by-host/endurance/config/shell.nix

@@ -0,0 +1,14 @@
+{pkgs, ...}: {
+  programs.fish = {
+    enable = true;
+
+    interactiveShellInit = ''
+      # Kitty shell integration - enables command markers and sticky command display
+      if set -q KITTY_INSTALLATION_DIR
+        set --global KITTY_SHELL_INTEGRATION enabled
+        source "$KITTY_INSTALLATION_DIR/shell-integration/fish/vendor_conf.d/kitty-shell-integration.fish"
+        set --prepend fish_complete_path "$KITTY_INSTALLATION_DIR/shell-integration/fish/vendor_completions.d"
+      end
+    '';
+  };
+}