Documentation audit: refresh README, resolve stale PLAN.md items, list open items

README.md

@@ -1,20 +1,43 @@
 # planck — 20-node Raspberry Pi 4 home lab
 
-20× Raspberry Pi 4 Model B (8GB), each booting a 240GB USB SSD. Named
-`planck001`–`planck020`. Network: Ubiquiti UDM Pro, 2 switches, one router.
-Synology NAS on the same LAN for shared storage.
+20× Raspberry Pi 4 (8GB, ARM64), each booting a 240GB NVMe-in-USB stick.
+Fresh Raspberry Pi OS Lite (Debian 13) everywhere, running a k3s Kubernetes
+cluster: servers planck002/003/004 (embedded etcd), workers 001 + 005–020.
 
-## Docs
+**Home page: https://carr.pub** (served by this cluster).
 
-- `docs/INVENTORY.md` — hardware inventory (regenerate: `./scripts/inventory.sh > docs/INVENTORY.md`)
-- `docs/MACS.txt` — eth0 MAC addresses (for DHCP reservations)
-- `docs/PLAN.md` — the rebuild plan and decisions log
+## The map
 
-## Scripts
+| Path | What it is |
+|------|-----------|
+| `docs/PLAN.md` | Full history: what was built, every bug and its fix, postmortems. READ FIRST |
+| `docs/IPS.md` | Node ↔ IP ↔ MAC table (static IPs, pinned on nodes) |
+| `docs/INVENTORY.md` | Hardware inventory per node |
+| `scripts/flash-one.sh` | Reimage a node's NVMe stick (run on laptop via pkexec) |
+| `scripts/k3s-join.sh` | Join servers/agents to the cluster (needs K3S_TOKEN) |
+| `scripts/loadtest.sh` | Spawn a k6 load swarm across N nodes |
+| `scripts/inventory.sh` | Regenerate hardware inventory |
+| `manifests/monitoring/` | Prometheus, node-exporter, Grafana, DDNS CronJob |
+| `manifests/loadtest/` | k6 rig + practice target |
+| `manifests/web/` | The carr.pub site + Ingress |
+| `manifests/cluster-issuer.yaml` | Let's Encrypt issuer |
+| `configs/` | Node password (gitignored), installer internals, retired netboot servers |
 
-- `scripts/inventory.sh` — collects hardware/network inventory from all nodes
+## Daily operations
 
-## Node access
+- kubectl on the laptop: `~/.local/bin/kubectl` (kubeconfig `~/.kube/config`)
+- SSH any node: `ssh adamcarr@planck0NN.local` (passwordless sudo)
+- Grafana: `kubectl -n monitoring port-forward svc/grafana 3000:3000`
+- Load test: `scripts/loadtest.sh <url> [pods] [vus-per-pod] [duration]`
+- New public site: Ingress in `web` namespace on `<name>.carr.pub` with the
+  `cert-manager.io/cluster-issuer: letsencrypt-prod` annotation + DNSimple
+  record
 
-SSH: `ssh adamcarr@planck0NN.local` (key auth set up 2026-09-19). mDNS
-resolves `planck0NN.local` across subnets.
+Agent documentation lives in `~/.agents/skills/planck-cluster/SKILL.md`
+(loaded automatically by opencode sessions).
+
+## Safety rules
+
+- Never reboot more than ONE of planck002/003/004 at once (etcd quorum)
+- Images must be linux/arm64 multi-arch
+- The cluster room switch shares a PSU with nodes 011–015