Auth docs.

CLAUDE.md

@@ -20,7 +20,8 @@ NixOS cluster configuration using flakes. Homelab infrastructure with Nomad/Cons
 ├── docs/
 │   ├── CLUSTER_REVAMP.md    # Master plan for architecture changes
 │   ├── MIGRATION_TODO.md    # Tracking checklist for migration
-│   └── NFS_FAILOVER.md      # NFS failover procedures
+│   ├── NFS_FAILOVER.md      # NFS failover procedures
+│   └── AUTH_SETUP.md        # Authentication (Pocket ID + Traefik OIDC)
 └── services/            # Nomad job specs (.hcl files)
 ```
 
@@ -76,6 +77,12 @@ NixOS cluster configuration using flakes. Homelab infrastructure with Nomad/Cons
 - SOPS for secrets, files in `secrets/`
 - Keys managed per-host
 
+**Authentication**:
+- Pocket ID (OIDC provider) at `pocket-id.v.paler.net`
+- Traefik uses `traefik-oidc-auth` plugin for SSO
+- Services add `middlewares=oidc-auth@file` tag to protect
+- See `docs/AUTH_SETUP.md` for details
+
 ## Migration Status
 
 **Phase 3 & 4**: COMPLETE! GlusterFS removed, all services on NFS