refactor(standardize): remove dead code, fix inconsistencies, update docs

roles/global_defaults/tasks/hypervisor.yml

@@ -2,7 +2,6 @@
 - name: Ensure hypervisor input is a dictionary
   ansible.builtin.set_fact:
     hypervisor: "{{ hypervisor | default({}) }}"
-  changed_when: false
 
 - name: Validate hypervisor input
   ansible.builtin.assert:
@@ -19,4 +18,3 @@
   ansible.builtin.set_fact:
     hypervisor_cfg: "{{ merged }}"
     hypervisor_type: "{{ merged.type | string | lower }}"
-  changed_when: false