DOCFIX-177: make the skill and runbooks/README.md aware the VR1 DC-DC track exists ...

Found while the operator was heading to the vcloud host to begin real
execution: SKILL.md and runbooks/README.md (what its routing table points
to) had zero mentions of the entire VR1 DC-DC track, so a fresh session
would be routed to VR0's phase-01..08 runbooks with no indication today's
actual mission (dc-dc-phase0..6 + the new teardown runbook) exists.

Added a "VR1 DC-DC track" index to runbooks/README.md, VR1-specific rows
to SKILL.md's routing table and standard loops, and pointers in
references/environment.md and references/troubleshooting.md.

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