Session-scoped (GA-R2). Branch dc-dc-stage5-preconditions. Stage 5 remains OPEN (this is NOT a stage close). Under blanket approval the changelog is the review surface: each item = what / why (evidence) / revert.
Evidence capture (all read-only measurement + the one gated install): docs/audit/stage5-dc0-phase03-coreverify-20260806.txt.
What. sudo apt-get install -y python3-openstackclient on the dc0 rack (vr1-dc0-rack, 172.31.0.2). Landed python3-openstackclient 6.6.0-0ubuntu2
python3-openstacksdk 3.0.0-0ubuntu2 from noble/main. Verified openstack --version -> openstack 6.6.0. Why. Step 7 (phase-03) is the first phase to invoke the openstack CLI, and per D-138 that CLI runs FROM the DC rack (no L3 path from voffice1 to the cloud). The 07-27 install landed only on voffice1. phase-03-admin-openrc.sh failed "openstack not found" on the rack. This is the documented remediation of the 07-30 queued-finding F1 ("Install on the DC client host before Step 7"); pin is the measured 07-27 value, snap refuted, noble-native Caracal so no UCA. Revert. ssh vr1-dc0-rack 'sudo apt-get purge -y python3-openstackclient python3-openstacksdk' (client-only; no service impact).What. scp staged scripts/phase-03-admin-openrc.sh (sha 2aeb20b720d83944) and scripts/extract_admin_password.py (sha 7b9b25a8fafd75cb) into ~/repo-stage/scripts/ on the dc0 rack; both sha256-verified == repo HEAD. Why. D-138 rack-run discipline: Step 7 runs the tested phase-03 admin-openrc builder from the rack's staged copy, sha-verified before trust. Revert. ssh vr1-dc0-rack 'rm ~/repo-stage/scripts/phase-03-admin-openrc.sh ~/repo-stage/scripts/extract_admin_password.py' (redeploy inputs, not live state).
What. MODEL=vr1-dc0 KEYSTONE_VIP=10.12.4.50 phase-03-admin-openrc.sh wrote ~/admin-openrc (0600) + ~/vault-init/vault-ca-root.pem on the rack; scoped token issued. Secret-adjacent files, on-rack only; password never entered context (script prints length only). Why. phase-03 Step 3.2 -- the IP-only admin credential + vault CA for API verification. Two-source keystone VIP confirmed (overlay == live endpoint). Revert. ssh vr1-dc0-rack 'rm ~/admin-openrc' (regenerable from live state).
What. In-row amendment: client now INSTALLED ON THE dc0 RACK; the D-138 correction that phase-03..06 run from the rack, not voffice1; dc1-rack install OWED. Verify command + host cell updated. Why. GA-R1/C1 -- a commit that changes a status CURRENT-STATE carries updates it in the same commit. Real measured status change (client presence on the rack). Revert. git revert this commit's CURRENT-STATE hunk.
What. Added the Step-7 phase-03 core-verify progress block: core-API VERIFIED, exit gate OPEN on F-CV3 (dashboard TLS) + Step 3.4; F-CV1 retraction; F-CV2 resolve. Why. Stage/gate status lives in CURRENT-STATE only (GA-R1). Revert. git revert this commit's CURRENT-STATE hunk.
check-ssl -> backend DOWN. designate-api is UP; the "collateral of the Stage-7 block" reading is RETRACTED.lib_net_select_dc (harmless on dc0, WRONG+silent on dc1). Fix before dc1's Step 7.