DOCFIX-208: the dc0 deploy command was missing a load-bearing overlay ...

The phase-4 runbook told the operator to deploy vr1-dc0 WITHOUT
overlays/vr1-dc0-machines.yaml, on the stated grounds that the file does
not exist. It has existed since 2026-07-29. preflight.sh P2 folds it into
the merged input it validates, so P2 was grading an input the deploy would
not have passed.

Re-measured by deep-merging bundle.yaml against the overlay: SIXTEEN
applications carry a delta, not the one this repo recorded on 2026-07-31.
ovn-chassis.bridge-interface-mappings (whose ONLY source is this overlay --
bundle.yaml:494 forbids re-adding it there) plus 15 mirror repoints from
the 2026-07-31 UCA ruling. Deploying as written would have taken two
injuries, neither surfacing as a deploy error: no br-ex mapping (dead
provider egress) and 15 charms pointed at a UCA measured unreachable from
a node under the D-107 airgap.

Corrected at 6 sites (4.1 table + prose, 4.2 dry-run, 4.3 deploy, Step 7
dry-run + its rules sentence, 4.2 VERIFY-LIVE pointer). Step 4.2's gate
could not have caught any of it -- its four items read the machines block,
machine count and VIPs, while the overlay's whole payload is under
applications: -- so gate items 5 and 6 were added to assert the merged
ovn-chassis options map and the reachability of every origin/source.

preflight.sh needed no change: it was already right.

CURRENT-STATE corrects its own narrower 2026-07-31 finding in place
(GA-R1 C2). repo-lint 0 fail / 1 legacy warn.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HvCyrwvYTTcDYnRErfMsNf