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

- Remove unused sudo_lecture.txt.j2 template (never referenced)
- Add vars_proxmox.yml and .sisyphus/ to .gitignore
- Remove redundant inner when conditions in cleanup/vmware.yml
- Standardize bootstrap_var_key usage in alpine, opensuse, void tasks
- Normalize sysctl key=value formatting (remove inconsistent spaces)
- Add vars_baremetal_example.yml to README examples list
- Remove unnecessary changed_when on set_fact in hypervisor.yml

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

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