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

D-126: durable rootless agent access to VR1 site VMs (shell + forward) + DC creds prep ...

Establishes durable, rootless jumphost->site-VM access so the recurring
sudo-route friction stops (and generalizes to the DCs). Operator ruled Option A
(SSH via systemd --user / ssh_config ProxyJump), advisor-conferred.

Shell layer (FOUNDATION, EXERCISED): scripts/site-ssh-config.sh generates
~/.ssh/config.d/vr1-sites ProxyJump aliases (voffice1, office1-netbox,
office1-tailscale, office1-opnsense). All four aliases proven live from the
agent's session after the operator installed with the one-key office1 env key --
key read from IdentityFile, no creds path in any command (clears the guard hook).

Forward layer (convenience, reviewed-but-unexercised): scripts/site-forward.sh
holds a systemd --user SSH local-forward -> http://127.0.0.1:8000 for office1-netbox.

Secrets boundary: the key is operator-supplied via --key (a PATH, never read/baked);
generated fragments name that path and are written locally (not committed).

DC prep: per-env-key isolation (operator ruling) -- each DC gets a DEDICATED key in
its own ~/vr1-dc<N>-creds/ folder, minted at deploy. Folders pre-created (0700);
creds-manifests/vr1-dc{0,1}.manifest declare the keypairs. DC ssh aliases deferred
until their IPs are measured post-apply.

Also: D-124 dc0 rack tfvars written locally (opentofu/d124-rack.auto.tfvars,
gitignored) -- the independent `tofu plan` unblocker. vr1_dc1_rack_* NOT written
(no ruled dc1 addressing; variables absent) -- STOP flagged for an operator ruling.

Tests: site-forward 38/38, site-ssh-config 30/30; repo-lint 0-fail (1 legacy WARN).

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