Add Ansible playbooks for MeshCore monitoring node deployment

Roles: base (apt, tailscale, motd), meshcore_cli (pipx), meshcore_capture
(agessaman/meshcore-packet-capture + .env.local template), scripts (voltage, bandwidth).

Host vars contain per-device serial ports; group vars hold shared MQTT broker config.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ansible/group_vars/all.yml

@@ -0,0 +1,5 @@
+remote_user: david
+ansible_user: "{{ remote_user }}"
+ansible_become: true
+
+meshcore_description: "meshcore management"