Operator ruling 2026-07-25. Question: v4-only vs dual-stack for dc1 phase-4.
Utterance (verbatim): "Dual stack to be used where IPv4 is required, IPv6 where
IPv6 only makes sense." Clarifying: "Dual stack deployment for DC0 and DC1. This
is the deployment when the dual-stack is added".

- docs/design-decisions.md: dated RULING NOTE under ## D-101 with the verbatim
  question + utterance (confirms D-101's matrix; changes nothing).
- docs/CURRENT-STATE.md: resolve-before-deploy bullet (b) RESOLVED -- v4-only
  phasing CLOSED for both DCs; VIP-overlay reconciliation now non-deferrable.
- changelog item 12.

The verbatim is transcribed into durable committed homes (D-101 note + changelog),
NOT left in the delete-after-use _handoff-not-committed/ pack (committee BLOCKER-1).
GA-R5: this ruling lands before the dependent VIP-reconciliation / deploy work.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VUjEb7onHpdqFHUnio6iVw