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/wireguard/main.tf

@@ -1,15 +0,0 @@
-variable "tls_secret_name" { type = string }
-
-data "vault_kv_secret_v2" "secrets" {
-  mount = "secret"
-  name  = "platform"
-}
-
-module "wireguard" {
-  source          = "./modules/wireguard"
-  tls_secret_name = var.tls_secret_name
-  wg_0_conf       = data.vault_kv_secret_v2.secrets.data["wireguard_wg_0_conf"]
-  wg_0_key        = data.vault_kv_secret_v2.secrets.data["wireguard_wg_0_key"]
-  firewall_sh     = data.vault_kv_secret_v2.secrets.data["wireguard_firewall_sh"]
-  tier            = local.tiers.core
-}