Add dockhand role to initial_install

Tagged never,dockhand_install so it only runs when explicitly requested.
Installs docker.io + docker-compose-v2, templates a compose file for
fnsys/dockhand:latest at /docker/dockhand, and wires a oneshot systemd
unit that brings the stack up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

initial_install/roles/dockhand/handlers/main.yml

@@ -0,0 +1,9 @@
+---
+- name: Reload systemd
+  ansible.builtin.systemd:
+    daemon_reload: true
+
+- name: Restart dockhand
+  ansible.builtin.systemd:
+    name: dockhand
+    state: restarted