geneve-over-v6 wrap-gate ROOT-CAUSED (FAIL): OVN encap family split control(v4)/compute(v6) ...

The dc0 "verify-live geneve-over-v6" checkpoint gate FAILS, root-caused this session
via the 1-test-LB smoke test. Measured: OVN geneve encap IPs are split across address
families -- containerized control-node chassis (octavia LXD) have IPv4-only data-plane
addresses (10.12.16.x, D-134 auto-picked) -> IPv4 encap; carved compute metal uses IPv6
(2602:f3e2:f02:30::x). Cross-family geneve tunnels never form (bfd_status empty) -> 100%
cross-node overlay loss -> amphora unreachable from o-hm0 -> LB stuck PENDING_CREATE.

Roosevelt-delta: v6 builds must give containerized OVN chassis a v6 data-tenant address
so encap is family-consistent with metal. Candidate D-143 (PROPOSED, operator ruling owed).
Fix NOT applied (substantial + rebuild-relevant). Full record:
docs/audit/geneve-over-v6-rootcause-20260808.md. CURRENT-STATE progress block updated
(clears repo-lint L10 for the audit file).

Revert: git revert this commit (records only; no live cloud state changed).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fg98z7QyzwYUs8fsWCn728