DOCFIX-153: Stage 1 runbook -- Phase 0 vcloud host preparation ...

Command-level runbook for turning the bare vcloud host into a VR1 substrate:
measure CPU/RAM/disk/nested-KVM/MTU, enable nested KVM, prepare storage pool
paths, install/confirm OpenTofu, write tfvars from measured values, init/
validate/plan/apply the DC1 planes + Office1 pool + mesh links, verify
against the Phase-0 gate. Flags a real open question (unconditional MAAS
provider block possibly demanding credentials before Stage 2 stands up
MAAS) rather than silently working around it. Not yet executed -- this is
the hand-off artifact for tomorrow morning's switch to the vcloud host.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QrcJx8TUar7pYAvpGJw57A