Block B complete: d124-transit-seed tooling + full D-124 NetBox import ...

Operator chose "write the seeder". netbox/d124-transit-seed.py (NEW) + harness
(21/21, incl. a cross-file consistency check so the seeded role/container can't
drift from dc-rack-mgmt-import's required ROLE_SLUG/CONTAINER) -- mirrors
d115-office-carve (NB client, sandbox gate, WAF UA, dry-by-default). Seeds ONLY
the transit role + the 172.31.0.0/24 UNSCOPED container (mirrors edge's /16).

Ran on the apex (gated, dry-run-verified, token server-side, sandbox-only):
seed -> role transit (id=30) + 172.31.0.0/24 (id=137); then dc-rack-mgmt-import
placed 172.31.0.0/30 (transit, vr1-dc0) + 10.12.8.2/22 (rack, dns=vvr1-dc0),
matching the vr1_dc0_rack_* tfvars. Full D-124/edge-WAN IPAM now in the apex.

changelog/ledger/readiness updated (Blocks A+B DONE).

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

DC0 prep COMPLETE (2026-07-17): lock deploy-ready state ...

Final gate re-verified: opentofu-validate clean, the four vr1_dc0_rack_* +
vr1_dc0_ssh_pubkey_path tfvars in place, creds-audit vr1-dc0 CLEAN, gauntlet ALL
GREEN (65), repo-lint 0-fail. netem clarified as deploy-time (Step 11, the module
isn't pre-instantiated -- no prep tfvar). NetBox import clarified as decoupled
hygiene (importer not on the apex host; no netbox provider in the tree).

Remaining is NOT prep: the bookend restart (vcloud + voffice1 + opnsense patched
and rebooted together -- voffice1 is load-bearing like vcloud, so it defers with
it, not mid-prep) as the boundary into the new session; then fresh-session re-verify
of the plan + logged shell + gated outer apply. Readiness doc + ledger marked
PREP COMPLETE.

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

DC0 deploy-readiness handoff: per-env-key ruling implemented + netem ruled + prep checklist ...

Prep for a fresh session to run the Stage-3 Phase-2 DC0 build. Nothing applied;
the outer tofu apply remains the first (operator-gated) mutation.

Per-env-key (D-126, operator ruling 2026-07-16, option a): vvr1-dc0 gets its OWN
access key, not office1's. Minted ~/vr1-dc0-creds/vr1-dc0_svc_ed25519 (creds-audit
CLEAN); added variable vr1_dc0_ssh_pubkey_path; vvr1-dc0 cloud-init now installs the
dc0 pubkey (voffice1 keeps office1's key -- only the vvr1_dc0 block changed). Re-
validated + re-planned: outer plan UNCHANGED at 5 add / 0 change / 6 destroy (the
cloud-init edit is create-only content, no new destroys/replaces of live infra).

netem (D-100 gap #11): RULED = placeholder for the rehearsal; final values deferred.

docs/dc0-deploy-readiness.md (NEW): the full readiness state (outer plan verified
safe -- vvr1-dc0 416GiB/108vcpu, 6 empty-plane relocation, 980GiB RAM headroom),
remaining prep (pre-apply / mid-deploy / non-blocking), fresh-session bootstrap, and
the gated A-E deploy sequence. Ledger points at it.

Gauntlet ALL GREEN (65 harnesses incl. the 2 new access harnesses); repo-lint 0-fail;
opentofu-validate clean (both roots + 12 modules). The dc0 private key + local tfvars
stay gitignored/off-repo.

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