Documents why WSL2 hosts fail an Ansible reboot play at privilege
escalation (Timeout waiting for privilege escalation prompt) — WSL2 has
no real reboot semantics + become stalls over the Windows OpenSSH->WSL2
bridge — and the fix: scope reboot.yml to hosts: all:!wsl. Registered
in SUMMARY.md and 05-troubleshooting/index.md.
