infra: join ludo-mini to hubris as Homelab cluster node "strong"

Reformatted the ludo-mini workstation to Proxmox VE 9.2.3 and joined it
to hubris's existing single-node "Homelab" cluster (2 nodes, no QDevice
yet). Added a second NVMe as its own LVM-thin pool (ludo-lvm). Renamed
the wiki/inventory identity from ludo-mini to strong to match the OS/
cluster hostname, since bootstrap's client-enrollment lookup depends on
that match. Also regenerated hosts/grimmory.yaml, which was missing from
git despite being referenced by inventory.yaml.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.sops.yaml

@@ -41,7 +41,7 @@ creation_rules:
   - path_regex: ^secrets/gitea-tokens\.yaml$
     # Workstations only.
     age: >-
-      # placeholder — fill with age_pubkey of: republic-laptop, mac-mini, ludo-mini, hubris
+      # placeholder — fill with age_pubkey of: republic-laptop, mac-mini, strong, hubris
 
   - path_regex: ^secrets/webhook-hmacs\.yaml$
     # LXCs that run a webhook receiver.