C2(migrate-immich-to-ringtail): close sifaka-nfs-from-ringtail

Verified on k3s-ringtail:
- Sifaka NFS export /volume1/photos covers 192.168.1.0/24 +
  100.64.0.0/10. Ringtail at 192.168.1.21 is in scope; no DSM rule
  changes needed.
- nfs-test pod mounted the share, read existing library/ thumbs/
  backups/ encoded-video/ profile/, wrote a temp file, deleted it.
- DNS resolution: sifaka → 192.168.1.203 (LAN). NFS traffic stays
  off tailnet, avoiding the sifaka-tailscale-userspace concern.
- Committed PV + PVC bind on first apply (RWX, 2Ti).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/how-to/immich/sifaka-nfs-from-ringtail.md

@@ -2,7 +2,6 @@
 title: Sifaka NFS Photos from Ringtail
 modified: 2026-05-13
 last-reviewed: 2026-05-13
-status: active
 tags:
   - how-to
   - operations