ensureSamba joins EnsureBaseStack after filebrowser, gated on SMB.Enabled
(cloudflared conditional precedent); reconcile is idempotent (unchanged config +
running container = ZERO compose calls, asserted via seam). Atomic tmp+fsync+
rename config writes. Password applied via smbpasswd on STDIN (never argv/log/
settings). Disable = compose down, volumes + folders KEPT. samba added to
IsProtectedStack in code (controller.yaml is golden-generated and predates it),
which also makes the app-backup loops correctly skip it.
