fix(playbook): reset SSH connection before post-reboot tasks

The stale SSH ControlMaster socket from the installer session persists
after the VM reboots, causing the post-reboot package install to fail
with "Pseudo-terminal will not be allocated / Connection closed".

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

main.yml

@@ -111,6 +111,11 @@
           }}
       changed_when: false
 
+    - name: Reset SSH connection before post-reboot tasks
+      when:
+        - post_reboot_can_connect | bool
+      ansible.builtin.meta: reset_connection
+
     - name: Set final SSH credentials for post-reboot tasks
       when:
         - post_reboot_can_connect | bool