cifs: acceptance — live smbclient/mount -t cifs + Trident/SDK + multiprotocol + NFS regression

[hartsock]

Goal

Prove the SMB data plane against real clients and gate it.

Scope

• Live (root) test: enable CIFS via REST → smbclient / mount -t cifs
  create/read/write/delete against a share.
• netapp-ontap SDK / Ansible drive the CIFS service + share lifecycle
  end-to-end.
• Multiprotocol check: a volume reachable over both NFS and CIFS.
• NFS planes (v3 and, if present, v4.1) unaffected. Live/root-only gate in CI.

Dependencies

#64.

Acceptance

• Green live SMB gate; NFS regression green; multiprotocol read/write proven.