lib-identity.sh: the estate's name and DNS base in ONE place ...

Operator: 'The specific server and region names do not matter as they change
during every deployment and hardening of the deployment workflow.' Then, after
scoping the two options: 'Yes, take option 2.'

WITHDREW MY OWN FIRST RECOMMENDATION. I proposed retiring the vr0-dc0 selector
as removing 'the ambiguity class outright'. Measured, wrong on both halves:
D-119 already closed it by region-qualifying (the hazard was the BARE dc0, which
is rejected loudly today); lib-net.sh:110 documents that arm as a NO-OP over the
file's flat defaults; and the footprint is 43 files, mostly the separate VR0
phase-NN track the VR1 runbooks cite as precedent. Medium cost, near-zero
benefit. Logged, not executed.

NEW scripts/lib-identity.sh -- CLOUD_NAME + CLOUD_DOMAIN, no side effects,
env-overridable. With <dc> and <region> already derived from the site token,
these were the LAST typed identity in the shell surface. A rebuild that renames
the estate now edits one file and the certs, zones, SANs and P7 all follow.

DELIBERATELY NOT lib-net.sh: sourcing that bare populates a full flat plane/VIP
namespace (its own header says so). A certificate checker needs two strings, not
a network namespace, and octavia-pki.sh sources NOTHING today -- pulling in
VR0-shaped defaults it never asked for is the R9 hazard in miniature. Sourced
from SCRIPT_DIR (sibling, survives the harness REPO override) and FAILS CLOSED
with REFUSE 3 if absent: a cert gate that invents the estate's identity is worse
than none.

Consumers: octavia-pki.sh derive_zone(), phase-01 1.0-GEN.c, dc-dc-phase6 Step 0.
The tofu side was ALREADY parameterised (opentofu/variables.tf domain_suffix
passed explicitly into modules/dc-planes), so nothing there changed.

HARNESS 48/48 -> 51/51:
- T45 the centralisation must be REAL, not decorative -- overrides both values
  and requires the zone to follow BOTH (acme.dc0.vr1.example.test). A constant
  nothing can vary is indistinguishable from a literal.
- T46 a missing lib-identity.sh REFUSES rather than guessing.
- T47 SHELL vs OPENTOFU drift. HCL cannot source a shell file, so two copies of
  one fact exist; if they part, the libvirt plane domains and the cert zones
  describe different estates and nothing else would notice. PROVEN able to fail
  by injecting a drifted value, then restored.

Also: repo-lint L6 flagged '. $REPO/scripts/...' as a bare invocation. Its own
docstring blesses a bash|source|python3 prefix and sourcing needs no exec bit,
so the RUNBOOK moved to the documented 'source' form -- the gate was not changed
for style. And ${REPO:?} is now guarded at its FIRST use in GEN.c, not only at
:538 below it.

STILL typed, deliberately: the site allowlists. One that accepts anything is how
a typo'd DC name becomes a wrong-target write.

gauntlet ALL GREEN (89); repo-lint 0 fail; GEN.c bash -n clean.

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