jmri: deploy udev rules for stable /dev/jmri/* symlinks

Rules were documented but never deployed — /dev/jmri/nce was missing
entirely, only /dev/jmri/loconet existed (created manually).

Adds:
- templates/99-jmri-devices.rules.j2: LocoBuffer-NG -> loconet,
  NCE Power Pro (Microchip CDC) -> nce
- Task to deploy rules + trigger udev settle
- Trigger udev handler (reload-rules alone is insufficient)

ansible/roles/jmri/handlers/main.yml

@@ -3,6 +3,10 @@
   ansible.builtin.command: udevadm control --reload-rules
   changed_when: false
 
+- name: Trigger udev
+  ansible.builtin.command: udevadm trigger --subsystem-match=tty
+  changed_when: false
+
 - name: Reload systemd
   ansible.builtin.systemd:
     daemon_reload: true