Build the (b) ruling: prefer-ipv6 emitted for NO application; 9b re-pointed ...

Renderer: the emission condition is DISABLED, not deleted -- when the v6
completion work lands (allocatable ranges on the six v6 plane subnets, rack-side
v6 legs, a v6 default route, v6-reachable services) that one line turns it back
on, and PREFER_IPV6_CHARMS is still the correct set to gate it by.

Both overlays re-rendered: exactly 7 lines removed per DC and nothing else --
all 13 apps keep 6-leg dual-family vips at both DCs.

INVARIANT 9b RE-POINTED, not deleted: it required the option and the v6 legs to
travel together on a declaring charm (the L3-9 defect), which would now fail on
the ruled artifact. The rule is the option must be ABSENT everywhere. L3-9 cannot
recur while it is absent -- there is nothing to keep while legs are dropped. It
returns to the coupling form when v6 is operational.

HARNESS re-pointed rather than deleted, and three stale fixtures fixed:
 - T20 was 'option without v6 legs FAILS'; now 'option on a DECLARING charm FAILS'
 - T21 was the inverse; now the POSITIVE CONTROL -- v6 legs WITHOUT the option
   must PASS, so 9b cannot be satisfied by rejecting everything
 - T22/T23/T30 each set prefer-ipv6 because the OLD coupling required it
   alongside v6 legs. Under the absence rule 9b fires FIRST and short-circuits,
   so their v6-band assertions would never have been reached and they would have
   passed for the wrong reason. The option is removed from those fixtures.

Mutation-proven: disabling the 9b absence check kills T20; re-enabling renderer
emission kills render-drift. Source restored byte-identical after each.

Gauntlet ALL GREEN (93); repo-lint 0 fail; harness 55/55.

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

Build the 2026-07-31 ruling: renderer + invariant 9 replaced, overlays re-rendered ...

Three parts, all mutation-proven.

(i) provider-bundle-check.py gains PREFER_IPV6_CHARMS -- the measured authority,
keyed by CHARM name, carrying the revisions and a re-measure warning -- and
invariant 9 is REPLACED, never deleted:
  9a  prefer-ipv6 on a charm that does NOT declare it FAILS. Asserted on
      PRESENCE, not truthiness: 'prefer-ipv6: false' is the same fatal
      'unknown option' to juju as true.
  9b  on a DECLARING charm it still travels with the v6 legs -- the L3-9
      protection is retained unchanged for those seven.
  9c  arity.
The old text's mechanism claim ("prefer-ipv6 makes HAProxy bind :::port") is
refuted by this session's measurement and is recorded as such in-file.

(ii) render-dc-overlays.py emits the option only for a declaring charm, READING
the set from provider-bundle-check with ast rather than restating it (the same
rule APP_OCTET already uses). render() keeps its purity property: the set is a
PARAMETER and the default REFUSES rather than defaulting to empty, because an
empty set renders a plausible artifact with the option nowhere. Both overlays
re-rendered: exactly SIX lines removed per DC and nothing else -- every vip
string byte-identical, so all v6 legs are retained.

(iii) tests/provider-bundle-check 44 -> 48/48. T43 reproduces the attempt-1
defect; T44 proves presence-not-truthiness; T45 is the positive control; T46
asserts the DIAGNOSIS.

MUTATION PASS -- six mutations, every one killed tests. And one NEW assertion
was found to be DECORATION and was REPLACED rather than kept: T46's first form
could not fail under any mutation, because a non-declaring charm with no option
reaches neither branch. Re-written to catch the fold-9a-into-9b simplification
and re-proven.

Gauntlet ALL GREEN (93); repo-lint 0 fail. The fixed dc0 deploy input now
sweeps CLEAN on option names: 75 assignments, 20 schemas, 0 unknown.

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

Ruling 3 commit 2: dual-stack ADD -- R2 and R11 are now BUILT, L3-9 resolved ...

Both per-DC VIP overlays re-rendered dual-family: every app carries
prefer-ipv6: true and a six-address vip, and vault .61 + designate .62 are
built. Measured both DCs: 13 clustered VIPs (13 dual-family) + 12 hacluster
principals all carrying a VIP -> PASS. With dc-ha-scaleup stacked: 13
principals, PASS -- R6's ruled ordering (VIPs before the HA overlay) is now
satisfied and executable. Two ruled-but-never-built decisions became
artifacts in one pass.

L3-9 RESOLVED. dc-dc-ipv6-family-matrix.yaml is narrowed to ceph-mon only;
its ten duplicate vip + prefer-ipv6 pairs (every value an unrendered token)
are gone, removed TOGETHER -- removing the vips alone would have recreated
the defect deliberately. Both merge orders now PASS, i.e. order-independent,
which is the actual fix. ceph-mon's ULA-only networks survive because they
exist in no other file. The two Launchpad citations arguing octavia lb-mgmt
IPv6 was an open risk are removed: both were read in full and both failed,
and R8 closed that question on 2026-07-27.

Also corrected at source: CURRENT-STATE described L3-9 as "the dangerous
merge order is the one that PASSES". Measured -- that stopped being true
when invariant 9 shipped on 2026-07-28. The merge semantics it describes
remain accurate; only the green-over-loss conclusion is retired.

Gate repairs the agents caught BEFORE the edit:
- phase-01's deploy guard would have ABORTED THE DEPLOY AGAIN -- its HI regex
  (5[0-9]|60) excludes .61/.62, so it would have read 13/11/0 against a
  required 11/11/0. Widened, counts moved to 13, verified 13/13/0 -> DEPLOY.
  Second near-miss on this one guard across two commits.
- pre-flight-checks CHECK 1 hardcoded if(n!=3) and would have failed all 13.
  Now takes a triple OR a sextet and asserts a sextet's last three legs are
  really v6. Proven able to fail on both new paths.

Harnesses re-pointed, never deleted. T16/T17 asserted R11's gaps were OPEN;
inverted to the surviving invariant and PAIRED with new T16b/T17b that remove
a VIP and demand the check still fires. T20/T21 had become no-ops that would
have gone GREEN testing nothing -- inverted. A v4-only twin fixture keeps the
pre-dual-stack cases testing their own invariants. The renderer harness now
proves reproduction on both shapes, including new T3b against the live
dual-family overlay.

provider-bundle-check 33/33; render-dc-overlays 18/18; render-baseline 10/10;
preflight 16/16; gauntlet ALL GREEN (85) on vcloud; repo-lint 0 fail / 611.

PREFLIGHT: BOTH STANDING REDS CLEARED, 3 fatal -> 2 fatal. The remaining two
are the deliberately-absent octavia-pki overlay and MAAS unreachable from
vcloud, which R10 measured clears on voffice1.

FLAGGED, not hidden: octavia's dual-family API VIP is an inference from R2
applied evenly, not a quoted ruling. Worth one operator confirmation.

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

Ruling 3 commit 1: bundle.yaml is VIP-free; dc0's VIPs are now a RENDERED overlay ...

The 11 inline vip: lines are gone from bundle.yaml and live in
overlays/vr1-dc0-vips.yaml, GENERATED by scripts/render-dc-overlays.py from
render/values/vr1-dc0-vips.yaml -- the renderer's first real output.
placement's then-empty options: block was dropped rather than left parsing
as null. Ruling 3's dual-stack ADD is commit 2 and is NOT in here.

PROVEN NEUTRAL by the ruling's own named check: provider-bundle-check on the
pre-extraction bundle and on the merged pair produce line-for-line identical
output, same known designate failure included. A structural diff separately
confirmed only vip moved -- applications 56 -> 56, relations 108 -> 108,
every other key byte-identical.

The 11 inline comments were carried, not dropped: extracted verbatim by
parser rather than retyped, via new optional per-app comment support in the
renderer. An app with no comment emits none, so dc1 still reproduces
byte-for-byte at 1634 bytes. The B1/B5 tokens stay DEFINED in bundle.yaml's
header and the overlay header names that, so the references do not dangle.

The blast-radius repair is the bulk of this, and every item was found BEFORE
the edit by the read-only agent sweep:

- preflight.sh P2 validated the bare base (11 phantom failures post-move) ->
  merged input.
- pre-flight-checks.sh CHECK 1 read the base as raw text and would have seen
  ZERO VIPs. This is BLOCKER-1, fixed the ruled way and not by bumping the
  count. Measured trap: the file sets IFS=$'\n\t', so a space-joined string
  reached grep as ONE filename, grep exited 2, pipefail propagated and the
  gate died silently mid-check. Fixed with a bash array.
- phase-01's RUN block gates juju deploy on 11/11/0 and would have read
  0/0/0 and ABORTED THE DEPLOY. Both guards now span base + overlay, and a
  second latent bug was fixed in the same edit: grep -c over two files prints
  one count PER FILE, so the bare $( ) captured a two-line string and every
  numeric test would have failed anyway. Now awk-summed; verified 11/11/0.
- phase-01's Octavia SAN derivation raised KeyError, swallowed by || true
  into an empty VIP. Now reads the overlay, deriving 10.12.4.57.
- phase-00 teardown, dc-dc-phase4's "NO VIP edits" guidance, appendix-A L3,
  and render-baseline's now-unverifiable bundle hash all repaired.

Harness 30 -> 31. The fixture base is now bundle + dc0 overlay, since that
pair is the deploy input; T16 renamed to match. NEW T31 asserts the bare base
fails for every clustered principal, so "deployed without its overlay" is a
tested state rather than an assumption.

Gauntlet ALL GREEN (85) on vcloud; repo-lint 0 fail / 610 files scanned.
Still red and expected: CHECK 1 at OK=11 want 13, and designate -- R11's
.61/.62 remain ruled-but-not-built, which is commit 2's job.

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