feat: add home-assistant-dashboard-conventions skill + update multiple skills

- New: smart-home/home-assistant-dashboard-conventions (Mushroom cards, view tabs, no Bubble Cards)
- Updated: rke2, ceph, galera, proxmox, brainstorming, compound-learning, 1password-cli, smart-home-automation skills
- New references: ceph-cluster-administration, docker-volume-forensics, ceph-crush-weight, ceph-ec-mixed-size

devops/proxmox-ve-administration/references/ct-deletion-stale-rbd-2026-07.md

@@ -0,0 +1,45 @@
+# CT Deletion with Stale RBD Config — 2026-07-14
+
+## Problem
+
+`pct destroy <CTID> --purge` fails with exit 255 when the RBD disk image
+was already deleted by a prior operation:
+
+```
+rbd error: rbd: error opening image vm-112-disk-0: (2) No such file or directory
+```
+
+The CT config file remains in pmxcfs (`/etc/pve/lxc/NNN.conf`), so
+`pct list` still shows the CT as `stopped`.
+
+## Fix
+
+```bash
+# On the PVE node hosting the CT:
+rm -f /etc/pve/lxc/NNN.conf
+# Verify:
+pct list | grep NNN  # Should return nothing
+```
+
+## Reliable CT Deletion Sequence
+
+1. `pct stop NNN` (ensure stopped)
+2. `pct destroy NNN --purge --destroy-unreferenced-disks`
+3. If it fails with RBD error but config remains:
+   `rm -f /etc/pve/lxc/NNN.conf`
+4. Verify: `pct list | grep NNN` → empty
+
+## Pitfall
+
+`--destroy-unreferenced-disks` helps clean up orphaned RBD images not
+referenced in the CT config, but if the RBD image is already gone, the
+flag doesn't suppress the error — it just tries and fails on the missing
+image. The config file is the leftover that needs manual cleanup.
+
+## Session Context
+
+CT112 (Authelia) was stopped and then deleted with `pct destroy 112
+--purge`. The RBD image was apparently already removed (possibly during
+a prior storage migration or manual cleanup), so the destroy command
+failed on the missing image. The config was manually removed with
+`rm -f /etc/pve/lxc/112.conf`.