Stage-3 review sweep C+D: Model B two-root reshape + SEC-010 hardening ...

Phase C (Model B reshape, D-123 operator ruling):
- outer root (opentofu/main.tf): vvr1-dc0 resized to whole-DC containment VM
  (108 vCPU / 425984 MiB / 3221225472000 bytes; expose_nested_virt=true;
  single Office1 transit leg); node/plane/wan/opnsense modules removed from
  vcloud level (MOVED markers), storage-04 added per R-3.
- inner root (opentofu/vr1-dc0-substrate/): NEW second root, provider
  qemu+ssh to vvr1-dc0; reuses ../modules/* verbatim to build 9 nodes +
  6 planes + wan + opnsense inside the containment VM. dmacvicar/libvirt
  0.9.8 pinned (.terraform.lock.hcl committed). Both roots tofu-validate.
- variables.tf: vvr1_dc0_vcpu/memory_mib/disk_bytes with derivation comment.

Phase D (SEC-010, R3-F02): site-headend-install.sh --host-nodes node-host
bootstrap installs qemu-kvm+libvirt, persists+verifies nested=1, writes a
transit FORWARD-drop (nftables inet sec010) enforcing DC-LOCAL under Model B.
Gate hardened (advisor catch): --check now verifies the keyed transit
interface EXISTS, else nftables oifname loads clean but matches nothing
(fail-open). Harness 49/49.

Records: D-103/107/114/121/122/123/124 amendments (append-only);
model-a-fallback-plan synced; ledgers + Phase-C changelog.

KNOWN GAP (OBS-3, operator-confirmed 2026-07-16): under Model B the inner
vr1-dc0-wan NAT is nested inside vvr1-dc0 (single transit NIC), severing the
simulated-ISP egress that Model A had at vcloud level. DC0/DC1 ARE meant to
have ISP connections -- egress path resolution is follow-up design work, not
resolved by this commit.

Present-only; not pushed. Gauntlet ALL GREEN (63); repo-lint 0 fail.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ck6xh3jWQi5b3Su8Dx1LEH

Review sweep A+B + R-3 storage-04: coherent record, whole-host calculator, R-3-compliant Model A fallback ...

Phase A (record amendments) + Phase B (scripts/dc-dc-whole-host-budget.py + harness) of the
Stage-3 adversarial-review sweep, plus the R-3 storage-04 addition (Model A layout now
3+2+4 = 9 nodes/DC). This commit is the R-3-COMPLIANT Model A state and becomes the re-cut
`model-a-fallback` anchor (the prior tag at 87a7a8a was R-3-stale -- 3 storage -- flagged by
the Model B design cross-check). NO cloud mutation; nothing applied.

- design-decisions.md: D-103/D-107/D-114/D-115/D-121/D-122/D-123/D-124 amendments (rulings R-1..R-4).
- scripts/dc-dc-whole-host-budget.py + tests/ (13/13): replaces the lost optc-calc.py (R3-F06).
- opentofu/main.tf: locals.vr1_dc0_nodes += storage-04 (R-3); tofu validate Success.
- security-ledger SEC-011 closed; session-ledger rulings + sweep progress; model-a-fallback plan.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ck6xh3jWQi5b3Su8Dx1LEH