Add k8s DaemonSet design for RKE2 nodes (Model A, per-node self-contained)

Design artifact (NOT applied). Per-node pod = host-poller + redis + web sharing
pod localhost; only host-poller privileged with hostPath /dev+/sys. No SAS
poller (no enclosures). MQTT_NODE_ID from spec.nodeName; MQTT creds via VSO
VaultStaticSecret reading secret/home_assistant (mqtt_user/pass -> MQTT_USERNAME/
PASSWORD). nodeSelector jbod-monitor=enabled to pin to pascal/currie/fermi.

k8s/README.md

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+# jbod-monitor on RKE2 (DaemonSet)
+
+Per-node self-contained deployment for Kubernetes worker nodes that can't run
+the docker-compose stack. Each opted-in node runs one pod (`host-poller` +
+`redis` + `web`) and publishes its own Home Assistant device
+(`JBOD Monitor (<node>)`) over MQTT.
+
+This mirrors the docker-compose stack with **no code changes** — each node is
+independent, exactly like the standalone hosts.
+
+## What it collects
+
+- **host-poller** (privileged, hostPath `/dev`+`/sys`): IPMI/iDRAC env, CPU
+  coretemp, on-metal drive SMART → node-local redis.
+- **web**: reads redis, publishes per-node MQTT discovery to the broker.
+- No SAS poller (no SES enclosures on these nodes). Consequence: host-drive
+  entities have no ZFS pool label (no zfs_map producer).
+
+## Prereqs to verify before applying
+
+1. **Registry pull**: confirm the cluster can pull `docker.adamksmith.xyz/*`.
+   If it needs auth, sync a `regcred` into the `jbod-monitor` namespace and
+   uncomment `imagePullSecrets` in `daemonset.yaml`.
+2. **VSO**: `vault-secrets-operator-system/openbao-kubernetes` VaultAuth exists
+   (it does, per infra notes). Confirm the `transformation.templates` syntax
+   matches the installed VSO version.
+3. **MQTT egress**: pods must reach `10.5.30.3:1883` (EMQX).
+
+## Apply order
+
+```bash
+# 1. Label ONLY the intended nodes (do not blanket-label all workers):
+kubectl label node usco-dc-pascal usco-dc-currie usco-dc-fermi jbod-monitor=enabled
+
+# 2. Namespace + DaemonSet:
+kubectl apply -f k8s/daemonset.yaml
+
+# 3. MQTT creds (VSO → Secret jbod-mqtt). Apply, then confirm it synced:
+kubectl apply -f k8s/mqtt-vaultstaticsecret.yaml
+kubectl -n jbod-monitor get vaultstaticsecret jbod-mqtt    # SYNCED=True
+kubectl -n jbod-monitor get secret jbod-mqtt               # has MQTT_USERNAME/PASSWORD
+
+# 4. Roll the web container so it picks up the secret (if it started first):
+kubectl -n jbod-monitor rollout restart daemonset/jbod-monitor
+```
+
+## Verify
+
+```bash
+kubectl -n jbod-monitor get pods -o wide        # one per labeled node
+kubectl -n jbod-monitor logs <pod> -c host-poller | grep sweep
+kubectl -n jbod-monitor logs <pod> -c web | grep -i mqtt   # "MQTT connected"
+```
+
+Then check Home Assistant for `JBOD Monitor (usco-dc-pascal|currie|fermi)`.
+
+## Notes
+
+- pascal (R620) already has an iDRAC "System Board Inlet Temp" in HA via another
+  integration — its env temp will partially duplicate; drives + CPU are net-new.
+- Pin image tags by SHA (already done: host-poller `514502e`, web `1839e9d`).
+- Removal: `kubectl delete -f k8s/daemonset.yaml` and unlabel the nodes.