Establish clean homelab infrastructure baseline

Reorganize the brownfield repository, remove retired and generated artifacts, harden ignore rules, and record the GitOps/IaC redesign.

platform/openebs/storageclasses.yaml

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+# ZFS-backed StorageClass for openebs zfs-localpv (provisioner zfs.csi.openebs.io).
+# Standalone resource — NOT part of the openebs Helm release. Backs PVCs on ZFS pool
+# `data/ceph`. Apply with: kubectl apply -f storageclasses.yaml
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: localpv-zfs-ceph
+provisioner: zfs.csi.openebs.io
+reclaimPolicy: Delete
+volumeBindingMode: WaitForFirstConsumer
+allowVolumeExpansion: true
+parameters:
+  poolname: data/ceph        # ZFS dataset the volumes are carved from
+  csi.storage.k8s.io/fstype: xfs
+  compression: lz4
+  dedup: "off"
+  atime: "off"
+  relatime: "on"
+  recordsize: 128k
+  volblocksize: 4k
+  thinprovision: "yes"
+  xattr: sa

platform/openebs/values.yaml

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+# openebs umbrella chart (openebs/openebs) values — single-node homelab.
+# Install/upgrade:
+#   helm upgrade --install openebs openebs/openebs --version 4.4.0 -n openebs -f values.yaml
+
+# Local ZFS provisioner ON — backs the cluster's PVCs (StorageClass localpv-zfs-ceph on
+# pool data/ceph, see storageclasses.yaml). LVM + rawfile OFF (unused — no LVM
+# StorageClasses/PVs/volumes). Replicated (Mayastor) OFF. Pinned explicitly so a future
+# chart-default change can't silently flip storage engines.
+engines:
+  local:
+    zfs:
+      enabled: true
+    lvm:
+      enabled: false
+    rawfile:
+      enabled: false
+  replicated:
+    mayastor:
+      enabled: false
+
+# The bundled Loki (logging) defaults to 3 SingleBinary replicas with one-pod-per-node
+# anti-affinity. On this single node, replicas 2 & 3 are permanently Pending. Filesystem-
+# backed SingleBinary Loki should be 1 replica anyway.
+loki:
+  singleBinary:
+    replicas: 1