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/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 }}