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/cleanup/tasks/vmware.yml

@@ -5,7 +5,6 @@
   become: false
   block:
     - name: Remove CD-ROM from VM in vCenter
-      when: hypervisor_type == "vmware"
       community.vmware.vmware_guest:
         hostname: "{{ hypervisor_cfg.url }}"
         username: "{{ hypervisor_cfg.username }}"
@@ -29,7 +28,6 @@
       failed_when: false
 
     - name: Start VM in vCenter
-      when: hypervisor_type == "vmware"
       vmware.vmware.vm_powerstate:
         hostname: "{{ hypervisor_cfg.url }}"
         username: "{{ hypervisor_cfg.username }}"