G12 dc1: item-3 substrate landed + harness reconcile (gauntlet 76 ALL GREEN) ...

Lands the disconnected session's authored tree (vr1_dc1 vars, vvr1-dc1 +
uplink modules, inner root vr1-dc1-substrate/ with 54 pre-pinned MACs,
lib-net dc1 arm + one-selection guard) and delivers changelog item 4:
six harnesses reconciled to the ratified dc1 selector arm, phase-00
PLANES/lib-net parity guard (exit 2, refuses cross-DC planning),
rbd-mirror + radosgw parent-shell selection (dc1 reminder now shows
10.12.84.0/22, not dc0's). Gauntlet ALL GREEN 76
(docs/audit/gauntlet-20260722-g12-reconcile.txt); repo-lint 0-fail.
G12 next gated step unchanged: operator-gated apex --commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VUjEb7onHpdqFHUnio6iVw

D-119: region-qualify the VR1 DC namespace -- C3 / gap #19 CLOSED (Stage 3 unblocked) ...

THE BUG: the token `dc0` meant TWO DIFFERENT CLOUDS depending on the file --
VR0's LIVE testcloud in scripts/lib-net.sh, VR1's FIRST DC in the NetBox
importer. One string, two clouds, one of them in production.

THE RULING (operator): the repo adopts the apex's names verbatim.
  vr0-dc0  VR0's DC0        the LIVE testcloud (a DIFFERENT region)
  vr1-dc0  VR1's FIRST  DC  GUA 2602:f3e2:f02::/48
  vr1-dc1  VR1's SECOND DC  GUA 2602:f3e2:f03::/48
Bare dc0/dc1/dc2 are now REJECTED LOUDLY everywhere.

D-119 COMPLETES D-117, it does not reverse it: it executes D-117's own amendment
across the three surfaces D-117 never touched. ZERO NetBox writes -- the apex was
already correct and self-consistent (MEASURED: f02::/48 -> vr1-dc0, f03::/48 ->
vr1-dc1); the REPO was the only surface out of step. Renaming the apex to match
the repo was considered and REJECTED (production IPAM write; VR1 would become the
only 1-indexed region; and vr1-dc1 would mean VR1's FIRST DC while vr0-dc1 means
VR0's SECOND).

THE PRIZE: the importer's DC->site map is now an IDENTITY -- there is no offset
table left to get wrong, and an assert enforces it. The original defect was
precisely a WRONG LOOKUP TABLE. The bug class is deleted, not defended.

TWO REAL BUGS the naming fix ALONE would NOT have closed (found by review sweep):

- BREAK-1: descriptions were built with f"VR1 {dc.upper()} ..." -- under D-119 that
  renders "VR1 VR1-DC0 provider-public" on all 36 prefixes. Same class as the
  original bug (deriving a label by munging a token), hidden in the description
  field where slug-focused review missed it. Now looked up from SITES[name].

- BREAK-2 (the important one): DC_GUA_PREFIX was NEVER cross-checked against --dc.
  `--dc vr1-dc0 DC_GUA_PREFIX=<f03>` was ACCEPTED: it writes the SECOND DC's GUA,
  carved with the FIRST DC's ULA nibble, scoped to the FIRST DC's site -- a
  silently mis-bound datacenter assembled from two disagreeing sources. Identity-
  mapping the slug leaves the ADDRESSING free-floating. Now guarded by EXPECTED_GUA.

ALSO: vdc1/vdc2 -> vvr1-dc0/vvr1-dc1 (D-114 amendment). D-114's own DR primitive is
`virsh destroy vdc1`, which read as "destroy VR1 DC1" while MEANING "destroy VR1
DC0". A mislabelled destroy command in a DR drill is not cosmetic. Neither VM is
built, so it is free. voffice1/Office1 KEEP their number (operator ruling).
Env var: DC1_/DC2_V4_SUPERNET -> VR1_DC1_V4_SUPERNET (both old names rejected).
rbd-mirror's --site-name aligned: `--dc vr1-dc0 --site-name dc1` was a re-created
two-namespace collision on one command line.

TESTS: dc-selector 21->30, prefixes-import 40->82 (identity invariant; EXPECTED_GUA
in BOTH mismatch directions; mismatched run writes NOTHING; matching pair still
succeeds; no munged description). GAUNTLET ALL GREEN (57). repo-lint 0 fail.
The old harnesses PINNED THE WRONG MAPPING -- they would have gone green while
enforcing the bug.

THE tofu apply IS NOT DONE -- IT IS GATED. Plan: 11 to add, 0 to change, 11 to
destroy (libvirt object names are ForceNew; moved{} makes the plan reviewable but
cannot suppress a replace). MEASURED SAFE: all 11 are EMPTY -- no guests, no
volumes, Stage 3 hasn't run. Office1's live objects are not in the plan.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

DOCFIX-166: $DC parameterization for reenroll-hosts/carve-host-interfaces/phase-00-maas-standup (gap #15, CLI half) ...

Each script gained an opt-in $DC env var, calling lib_net_select_dc/
lib_hosts_select_dc immediately after sourcing (unset $DC is byte-for-byte
unchanged VR0/DC0 behavior -- verified directly, no fixtures needed since
the selector calls sit before any MAAS call). DC=dc1 bash
scripts/phase-00-maas-standup.sh is now a real, correct, gated call
(D-101 makes dc1's target identical to dc0's); DC=dc1/dc2 for the other
two scripts still fails loud at the host selector until real per-DC host
data exists. New/extended test cases across three harnesses. Six of gap
#15's seven sub-findings remain open -- said plainly, not overclaimed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QrcJx8TUar7pYAvpGJw57A

Test patches

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