Disable the Raspberry Pi first-boot user wizard

Removing the SSH banner only hid the symptom. userconfig.service is a
Type=oneshot unit that runs

    whiptail --inputbox "Which user would you like to rename:" 20 60 pi

on tty8 and waits for an answer, which on a headless Pi never comes - it had
been sitting in "activating" for four and a half hours on musicdolphin. It is
WantedBy=multi-user.target, so that target never finished activating either, and
the boot job for it was still queued from boot. Anything ordered
After=multi-user.target then gets a start job that queues behind it and hangs
forever: musicmouse.service never started, and the ansible task that starts it
blocked until killed.

The pi user already exists on these images, so the wizard has nothing to do.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

roles/pi_standard_setup/tasks/main.yml

@@ -32,6 +32,25 @@
     path: /etc/ssh/sshd_config.d/rename_user.conf
     state: absent
   notify: Restart sshd
+- name: Check for the Raspberry Pi first-boot user wizard
+  ansible.builtin.stat:
+    path: /lib/systemd/system/userconfig.service
+  register: pi_standard_setup_userconfig
+
+- name: Disable the Raspberry Pi first-boot user wizard
+  # Removing the SSH banner above only hides the symptom. The wizard itself is a
+  # Type=oneshot unit that runs `whiptail --inputbox "Which user would you like to
+  # rename:"` on tty8 and waits for an answer that never comes on a headless box - it
+  # sits in "activating" forever. Because it is WantedBy=multi-user.target, that target
+  # never finishes activating either, and every unit ordered After=multi-user.target
+  # (musicmouse.service among them) gets a start job that queues behind it and hangs.
+  # The pi user already exists on these images, so there is nothing for it to do.
+  ansible.builtin.systemd:
+    name: userconfig.service
+    state: stopped
+    enabled: false
+    masked: true
+  when: pi_standard_setup_userconfig.stat.exists
 - name: Get hostname
   ansible.builtin.command: "raspi-config nonint get_hostname"
   register: pi_standard_setup_pi_hostname