fix(semaphore): become_key=None (wed has passwordless sudo)

Semaphore rejected the previous become_key=wed-ssh with 'access key
type not supported for ansible become user' — that field is for a
sudo PASSWORD (login_password type), not a reused SSH key. wed has
passwordless sudo on every host (set up by the VM template), so the
correct value is the built-in 'None' key.

ansible/group_vars/all/semaphore.yml

@@ -90,7 +90,10 @@ semaphore_config:
       # wed is the universal automation account pre-baked in every VM
       # template. Semaphore uses it for fleet-wide jobs.
       ssh_key: wed-ssh
-      become_key: wed-ssh
+      # become_key is Semaphore's sudo PASSWORD slot, not a second SSH
+      # key. wed has passwordless sudo on every host, so reference the
+      # built-in "None" key. (Semaphore rejects an SSH-type key here.)
+      become_key: None
 
   environments:
     - name: default