feat(minion): add atuin

We previously didn't use atuin because it was printing garbage
characters in bash... by switching to zsh we seem to have avoided this
problem :)

packetmix/homes/minion/atuin.nix

···
+# SPDX-FileCopyrightText: 2025 FreshlyBakedCake
+#
+# SPDX-License-Identifier: MIT
+
+{
+  programs.atuin = {
+    enable = true; # We're using z4h so we don't have the problems with garbage...
+    flags = [ "--disable-up-arrow" ];
+    settings = {
+      dialect = "uk";
+      exit_mode = "return-query";
+      inline_height = 0;
+      style = "auto";
+      update_check = false;
+    };
+  };
+
+  clicks.storage.impermanence.persist.directories = [
+    ".local/share/atuin"
+  ];
+}