feat(template-chart)!: ambientMesh becomes an object, and the CI exception gets a pinned expectation

Gitea #143, maintainer's instruction. Both numbers this switch renders are
ISTIO CONSTANTS rather than standards, and a value with a documented default
is the better home for a vendor constant than a template literal: an operator
can correct it when Istio changes the number, without waiting for a chart
release.

    networkPolicy:
      ingress:
        ambientMesh:
          enabled: false
          port: 15008
          redirectedProbeSources:
            - 169.254.7.127/32

One object under one switch, so the coupling argument survives the change
instead of being undermined by it - two separate values could drift apart,
which is the thing this design exists to prevent. redirectedProbeSources is a
LIST because a dual-stack cluster needs BOTH of Istio's addresses at once, not
one of two; that is a nameable case rather than speculation, so it does not
contradict reason 4 of the issue. Istio's IPv6 counterpart is documented as the
dual-stack addition, with the reason it is absent today unchanged: SingleStack
IPv4, and an ipBlock of the wrong family is accepted and matches nothing.

Named redirectedProbeSources, not probeSources, because the confusion risk with
networkPolicy.probeSources one level up is larger than the ingress/
ingressController one: that value holds YOUR worker node CIDRs, is empty by
default and means OPEN when empty; this one holds ISTIO's rewrite address and
ships filled, because unlike the node IPs it is a constant the chart can know.
The distinction is written where both appear.

PROVENANCE, which the previous round explained the coupling of but never
attributed. 15008 is Istio's HBONE port - not IANA-registered for this, not
prescribed by any protocol, unknown to Kubernetes. 169.254.7.127 is link-local
(169.254.0.0/16, RFC 3927, never routed - the range one picks vendor magic out
of); Istio's IPv6 counterpart fd16:9254:7127:1337:ffff:ffff:ffff:ffff carries
the same digits plus 1337, which is what vendor constants look like; and
Kubernetes knows the address in neither the NetworkPolicy API nor the kubelet -
only Istio's data plane rewrites the probe source onto it. Both read for
ztunnel 1.30.6. If either changes, the failure is SILENT: a pod unreachable in
the mesh, or probes dropped where probeSources is non-empty, which is nowhere
today.

NULL-SAFE, per #99 and because #136 shipped this exact defect one value away
(its NOTES.txt branch dereferenced .networkPolicy.egress directly): every read
goes through a fallback reproducing the chart's own declared defaults, so a
deleted object or one carrying only "enabled: true" renders the defaults rather
than failing. Clearing the probe-source list restores the constant instead of
removing the ipBlock, deliberately - the halves are not separable, and
enabled: false is how you open nothing.

THE CONSEQUENCE, and it is the point of the CI half. With the port
configurable, the exception can no longer be checked against the rendered
value: "whatever the value says" is design A's hole wearing design C's name,
and a mistyped port would pass by sitting in the configurable field. So the
expectation is PINNED IN THE TEST - AMBIENT_PORT and AMBIENT_CIDR - and
assertion 7 now checks two things instead of one: that the render at chart
defaults produces exactly that port and that ipBlock, and that every chart's
values.yaml DECLARES the same defaults, read back through ci/yaml2json rather
than by regex. A chart that drifts is red. Changing an Istio constant means
touching 30 values files AND the pinned lines, and the pinned lines are what
force someone to look.

That block is therefore also the single place saying what we hold Istio's
numbers to be, so it carries the provenance too. The renders set only
enabled=true and never a port override, on purpose: the pin is a statement
about the defaults we ship, not about what a release may choose - an operator
overriding a value is outside this test's reach, as for every value here.

The declared-defaults check is conditional on the chart offering probeSources,
like the inseparability check and assertion 4: the five charts whose probe rule
is never source-restricted render no ipBlock, so for them the key must be
ABSENT - a value reaching no rule reads as a control that does nothing - and
that absence is asserted rather than tolerated. Their schemas drop it too.

No version change: nothing of this is published, the switch stays additive with
its default off, and the render at defaults is byte-identical - re-diffed per
chart against origin/main, not assumed.

template-chart/values.schema.json

@@ -51,8 +51,28 @@
           "additionalProperties": false,
           "properties": {
             "ambientMesh": {
-              "description": "Opens the pod for Istio's ambient mesh; off by default and additive, so the render is byte-identical while it is false. Renders 15008/TCP inbound - ztunnel's HBONE tunnel, which ambient explicitly does not let bypass NetworkPolicy enforcement - AND, where probeSources is non-empty, 169.254.7.127/32 as an additional probe source, because inside the mesh the kubelet's probes are redirected away from the worker node's address. The two halves are inseparable on purpose: whoever opens 15008 by hand has not added the probe address, and the first narrowed probeSources then drops every probe, so the pod never becomes Ready and the symptom reads as a broken application rather than as a policy. Unproven in operation: that 15008 alone suffices comes from Istio's documentation, and no namespace of this cluster carries istio.io/dataplane-mode yet.",
-              "type": ["boolean", "null"]
+              "description": "Opens the pod for Istio's ambient mesh; off by default and additive, so the render is byte-identical while enabled is false. Renders the HBONE port inbound AND, where networkPolicy.probeSources is non-empty, the redirected probe source in the same \"from\" list. The two halves live in one object under one switch on purpose: whoever opens the port by hand has not added the probe address, and the first narrowed probeSources then drops every probe, so the pod never becomes Ready and the symptom reads as a broken application rather than as a policy. Both numbers are ISTIO CONSTANTS rather than standards, which is why they are values with documented defaults and not template literals - a vendor constant can change, and an operator should be able to correct it without waiting for a chart release. Deleting the whole object is safe: every read falls back to the defaults the chart declares. Unproven in operation: that the HBONE port alone suffices comes from Istio's documentation, and no namespace of this cluster carries istio.io/dataplane-mode yet.",
+              "type": ["object", "null"],
+              "additionalProperties": false,
+              "properties": {
+                "enabled": {
+                  "description": "The switch. Everything else in this object is inert while it is false.",
+                  "type": ["boolean", "null"]
+                },
+                "port": {
+                  "description": "Istio's HBONE port, default 15008. A constant Istio chose, not a standard: not registered with IANA for this, prescribed by no protocol, and unknown to Kubernetes. Read for ztunnel 1.30.6. It is the one ingress port of these charts that is deliberately no containerPort - ztunnel terminates it, not the application - and the exception ci/run-networkpolicy-test.sh grants it is pinned to the number THAT TEST knows, plus an assertion that this chart declares the same default. Not to whatever this value says: a value-driven exception would let a mistyped port ride in through a configurable field.",
+                  "type": ["integer", "null"],
+                  "minimum": 1,
+                  "maximum": 65535
+                },
+                "redirectedProbeSources": {
+                  "description": "Sources the kubelet's probes arrive from once Istio has redirected them, default [169.254.7.127/32]. NOT the same value as networkPolicy.probeSources one level up: that one holds YOUR worker node CIDRs, is empty by default and means OPEN when empty, and the chart cannot know those addresses; this one holds ISTIO's rewrite address and ships filled, because unlike the node IPs it is a constant the chart can know. Recognisable as vendor magic rather than protocol: it is link-local (169.254.0.0/16, RFC 3927, never routed), Istio's IPv6 counterpart fd16:9254:7127:1337:ffff:ffff:ffff:ffff carries the same digits plus 1337, and Kubernetes itself knows the address in neither the NetworkPolicy API nor the kubelet. A list and not a string because a dual-stack cluster needs BOTH entries at once; this cluster is SingleStack IPv4, so the IPv6 counterpart is left out of the default - an ipBlock of the wrong family is accepted and matches nothing. If Istio changes the address the failure is SILENT: probes dropped, and only where probeSources is non-empty.",
+                  "type": ["array", "null"],
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              }
             }
           }
         },