ansible: add reboot playbook and short hostname support

- Add reboot.yml playbook with rolling reboot (serial: 1)
  - Uses systemd reboot.target for NixOS compatibility
  - Waits for each host to come back before proceeding
- Update dynamic inventory to use short hostnames
  - ansible_host set to FQDN for connections
  - Allows -l testvm01 instead of -l testvm01.home.2rjus.net
- Update static.yml to match short hostname convention

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/playbooks/reboot.yml

@@ -0,0 +1,48 @@
+---
+# Reboot hosts with rolling strategy to avoid taking down redundant services
+#
+# Usage examples:
+#   # Reboot a single host
+#   ansible-playbook reboot.yml -l testvm01
+#
+#   # Reboot all test hosts (one at a time)
+#   ansible-playbook reboot.yml -l tier_test
+#
+#   # Reboot all DNS servers safely (one at a time)
+#   ansible-playbook reboot.yml -l role_dns
+#
+# Safety features:
+#   - serial: 1 ensures only one host reboots at a time
+#   - Waits for host to come back online before proceeding
+#   - Groups hosts by role to avoid rebooting same-role hosts consecutively
+
+- name: Reboot hosts (rolling)
+  hosts: all
+  serial: 1
+  order: shuffle  # Randomize to spread out same-role hosts
+  gather_facts: false
+
+  vars:
+    reboot_timeout: 300  # 5 minutes to wait for host to come back
+
+  tasks:
+    - name: Display reboot target
+      ansible.builtin.debug:
+        msg: "Rebooting {{ inventory_hostname }} (role: {{ role | default('none') }})"
+
+    - name: Reboot the host
+      ansible.builtin.systemd:
+        name: reboot.target
+        state: started
+      async: 1
+      poll: 0
+      ignore_errors: true
+
+    - name: Wait for host to come back online
+      ansible.builtin.wait_for_connection:
+        delay: 5
+        timeout: "{{ reboot_timeout }}"
+
+    - name: Display reboot result
+      ansible.builtin.debug:
+        msg: "{{ inventory_hostname }} rebooted successfully"