stem95su: scheduled Drive->site sync CronJob (every 10m)

CronJob stem95su-gdrive-sync (*/10) mounts the content PVC RW and
rclone-syncs the read-only Drive folder "claude" (stem claude/files) onto
it (rclone/rclone:1.74.3, scope=drive.readonly, empty-source guard +
--max-delete 25). ESO ExternalSecret stem95su-rclone <- Vault
secret/stem95su. Requires the GCP OAuth app published to Production or the
refresh token expires ~weekly.

Lands the gdrive-sync stack on master (it had landed on a feature branch
by accident on the shared devvm checkout).

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

stacks/sealed-secrets/modules/sealed-secrets/main.tf

@@ -1,50 +0,0 @@
-variable "tier" { type = string }
-
-# -----------------------------------------------------------------------------
-# Namespace
-# -----------------------------------------------------------------------------
-resource "kubernetes_namespace" "sealed_secrets" {
-  metadata {
-    name = "sealed-secrets"
-    labels = {
-      tier = var.tier
-      "keel.sh/enrolled" = "true"
-    }
-  }
-  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"]]
-  }
-}
-
-# -----------------------------------------------------------------------------
-# Sealed Secrets — encrypts secrets for safe git storage
-# https://github.com/bitnami-labs/sealed-secrets
-# -----------------------------------------------------------------------------
-resource "helm_release" "sealed_secrets" {
-  namespace        = kubernetes_namespace.sealed_secrets.metadata[0].name
-  create_namespace = false
-  name             = "sealed-secrets"
-  atomic           = true
-  timeout          = 300
-
-  repository = "https://bitnami-labs.github.io/sealed-secrets"
-  chart      = "sealed-secrets"
-  version    = "2.18.3"
-
-  values = [yamlencode({
-    crds = {
-      create = true
-    }
-
-    resources = {
-      requests = {
-        cpu    = "50m"
-        memory = "192Mi"
-      }
-      limits = {
-        memory = "192Mi"
-      }
-    }
-  })]
-}