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>

scripts/image_pull.sh

@@ -1,10 +0,0 @@
-#!/usr/bin/env bash
-
-for n in $(kubectl get nodes -o wide | grep node | awk '{print $1}'); do 
-    echo $n;
-    kubectl drain $n --ignore-daemonsets --delete-emptydir-data && \
-    ssh wizard@$n < image_pull_remote.sh
-    # Check result
-    kubectl get --raw "/api/v1/nodes/$n/proxy/configz" | jq '.kubeletconfig | {serializeImagePulls, maxParallelImagePulls}'
-    kubectl uncordon $n
-done