fix: restore tree dropped by 6d224861; land stem95su gdrive-sync (10m) [ci skip]

6d224861 came from a --no-checkout worktree whose empty index made the
commit drop every file except two. This restores 05b50d2b's full tree and
correctly adds stacks/stem95su/gdrive-sync.tf + the service-catalog stem95su
entry. Forward-only (parent=6d224861, no force-push); [ci skip] since the
live infra was never applied from the broken commit.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/cnpg/modules/cnpg/main.tf

@@ -0,0 +1,67 @@
+variable "tier" { type = string }
+
+# -----------------------------------------------------------------------------
+# Namespace
+# -----------------------------------------------------------------------------
+resource "kubernetes_namespace" "cnpg_system" {
+  metadata {
+    name = "cnpg-system"
+    labels = {
+      tier = var.tier
+    }
+  }
+  lifecycle {
+    # KYVERNO_LIFECYCLE_V1: goldilocks-vpa-auto-mode ClusterPolicy stamps this label on every namespace
+    ignore_changes = [metadata[0].labels["goldilocks.fairwinds.com/vpa-update-mode"]]
+  }
+}
+
+# -----------------------------------------------------------------------------
+# CloudNativePG Operator — manages PostgreSQL clusters via CRDs
+# https://cloudnative-pg.io/
+# -----------------------------------------------------------------------------
+resource "helm_release" "cnpg" {
+  namespace        = kubernetes_namespace.cnpg_system.metadata[0].name
+  create_namespace = false
+  name             = "cnpg"
+  atomic           = true
+  timeout          = 300
+
+  repository = "https://cloudnative-pg.github.io/charts"
+  chart      = "cloudnative-pg"
+  version    = "0.27.1"
+
+  values = [yamlencode({
+    crds = {
+      create = true
+    }
+
+    replicaCount = 1
+
+    resources = {
+      requests = {
+        cpu    = "100m"
+        memory = "256Mi"
+      }
+      limits = {
+        memory = "256Mi"
+      }
+    }
+
+    # Tune webhook-cert renewal threshold. CNPG default is 7 days remaining,
+    # which leaves no buffer when the cluster-health check (#22) flags
+    # certs at <30d. Bump to 30 days so the operator rotates well before
+    # external monitoring notices. Cert lifetime stays at chart default 90d.
+    config = {
+      data = {
+        EXPIRING_CHECK_THRESHOLD = "30"
+      }
+    }
+  })]
+}
+
+# NOTE: local-path-provisioner is already installed in the cluster
+# (via cloud-init template) with StorageClass "local-path" (default).
+# ReclaimPolicy is "Delete" — for CNPG clusters, set
+# .spec.storage.pvcTemplate.storageClassName = "local-path" in the
+# Cluster CR. CNPG handles PVC lifecycle independently.