Executes the operator-approved v4 revert. render/values/vr1-dc0-vips.yaml
family: dual -> v4, so the deploy overlay emits IPv4-only VIPs. The GUA v6 block
(prefixes_v6 / v6_family) is RETAINED per D-141 as the reserved apex allocation
and the future conversion input -- NOT deleted. When the compatibility gate
(docs/charm-ip-family-compatibility.md: juju LP#1723240 + per-charm fixes) clears,
flip back to dual, re-render, and promote the NetBox v6 VIPs reserved -> active.

Re-rendered overlays/vr1-dc0-vips.yaml: 13 v4 legs, 0 v6. Gates: render-drift
4/4 PASS, provider-bundle-check PASS, repo-lint 0 fail.

Live model change (juju config per API charm) is the next, separate step.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HvCyrwvYTTcDYnRErfMsNf