0.2.0 — vendor cert-manager + traefik; parameterized substrate

bootstrap.sh-equivalent K8s manifests now ship as part of this
chart instead of being installed inline by the customer's
`curl … | sudo bash`. Result: customer terminal time drops from
~5 min to ~1 min once Tower's SubmitConnect (B2) creates the
per-cluster Argo Application that points here.

What's vendored:
  - cert-manager v1.16.1 (helm dep, charts/cert-manager-v1.16.1.tgz)
  - traefik 33.2.1       (helm dep, charts/traefik-33.2.1.tgz)

What's parameterized via .Values.tenant.{domain,wildcardHost}:
  - letsencrypt-prod ClusterIssuer (DNS-01 + tenant's Cloudflare zone)
  - tenants Namespace
  - tenants-wildcard Certificate (commonName + dnsNames from helm.values)

What stays out of Git (Tower kubectl-applies via kubeconfig at
Connect time, sourced from the tenant's Vault paths):
  - cloudflare-api-token Secret (cert-manager ns)
  - s3-backup-creds Secret      (tenants ns)

The chart references both Secrets by name only.

Argo health roll-up: a tenant server is "Ready" when this
Application's Health is `Healthy` and the tenants-wildcard
Certificate's Ready condition is True. Tower's Server card UI
will surface this as "Provisioning…" → "Ready" in B4.

Lint + template clean with a real tenant value set; clean with
empty values too (templates skip themselves so a default-rendered
chart doesn't fail without a tenant).

templates/cluster-issuer.yaml

@@ -0,0 +1,37 @@
+{{- if .Values.tenant.domain }}
+# letsencrypt-prod ClusterIssuer — DNS-01 challenge via Cloudflare.
+# Scoped to the tenant's Cloudflare zone (.Values.tenant.domain) so
+# cert-manager only attempts records in zones the supplied token can
+# touch — wrong-zone tokens fail loudly at issue time rather than
+# silently re-trying forever.
+#
+# The cloudflare-api-token Secret is NOT in this chart. Tower
+# kubectl-applies it into cert-manager ns at Connect time using the
+# tenant's per-tenant Vault credential (v3/tenants/<id>/cloudflare-token).
+# The chart references it by name only.
+#
+# Sync wave: needs to land AFTER cert-manager's CRDs are installed
+# (cert-manager dep installs first); Argo's default ordering by
+# kind handles this.
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: letsencrypt-prod
+  labels:
+    app.kubernetes.io/managed-by: cluster-platform-v3
+spec:
+  acme:
+    email: {{ required "acme.email is required" .Values.acme.email | quote }}
+    server: {{ .Values.acme.server | quote }}
+    privateKeySecretRef:
+      name: letsencrypt-prod-account-key
+    solvers:
+      - dns01:
+          cloudflare:
+            apiTokenSecretRef:
+              name: {{ .Values.secrets.cloudflareTokenSecret.name | quote }}
+              key:  {{ .Values.secrets.cloudflareTokenSecret.key | quote }}
+        selector:
+          dnsZones:
+            - {{ .Values.tenant.domain | quote }}
+{{- end }}

templates/tenants-namespace.yaml

@@ -0,0 +1,10 @@
+# tenants Namespace — every tenant instance lives here. Created
+# explicitly (rather than relied on Argo's CreateNamespace) because
+# the wildcard Certificate below targets this namespace and Argo's
+# sync wave can race namespace-default-creation otherwise.
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: tenants
+  labels:
+    app.kubernetes.io/managed-by: cluster-platform-v3

templates/tenants-wildcard-cert.yaml

@@ -0,0 +1,31 @@
+{{- if .Values.tenant.wildcardHost }}
+# tenants-wildcard Certificate — issued ONCE per cluster, referenced
+# by every tenant instance's IngressRoute. Avoids Let's Encrypt's
+# 50-cert/week per-domain rate limit as the cluster scales to many
+# instances under one tenant.
+#
+# DNS-01 takes 30–90 s in normal Cloudflare conditions; cert-manager
+# retries forever on transient failures. The Argo Application that
+# deploys this chart is "Healthy" only when the Certificate's Ready
+# condition flips to True — Tower's UI uses that as the
+# "Provisioning → Ready" transition for the Server card.
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: tenants-wildcard
+  namespace: tenants
+  labels:
+    app.kubernetes.io/managed-by: cluster-platform-v3
+spec:
+  secretName: tenants-wildcard-tls
+  issuerRef:
+    name: letsencrypt-prod
+    kind: ClusterIssuer
+  commonName: {{ .Values.tenant.wildcardHost | quote }}
+  dnsNames:
+    - {{ .Values.tenant.wildcardHost | quote }}
+  # Renew 30 days before expiry — Let's Encrypt certs are 90-day, so
+  # this gives cert-manager a 30-day window to retry if Cloudflare
+  # has a bad day during renewal.
+  renewBefore: 720h
+{{- end }}