Switch to emacs-wayland on Arch, use package-provided emacs.service

- emacs → emacs-wayland in arch_profile_packages
- Remove custom emacs.service deployment: replace full .config/systemd/user/
  directory copy with individual service files (rclone-pcloud, syncthing)
- Remove emacs.service from desktop_systemd_user_services
- Enable package-provided /usr/lib/systemd/user/emacs.service via symlink
  in profile_desktop_gnome

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ansible/roles/profile_desktop_gnome/tasks/main.yml

@@ -17,6 +17,16 @@
     owner: root
     group: root
 
+- name: Enable package-provided emacs user service
+  tags: [services, dotfiles:desktop, emacs]
+  ansible.builtin.file:
+    src: /usr/lib/systemd/user/emacs.service
+    dest: "{{ user_home }}/.config/systemd/user/default.target.wants/emacs.service"
+    state: link
+    owner: "{{ username }}"
+    group: "{{ user_group }}"
+    force: true
+
 - name: Deploy gpg-agent.conf for GNOME (pinentry-gnome3, no ssh-support)
   tags: [dotfiles, dotfiles:desktop, gnome]
   ansible.builtin.copy: