Dual-IOM shelves (e.g. NetApp DS2246 with two IOM6 modules) create
two sysfs enclosure entries. The secondary path reports populated
slots via SES but the kernel only links block devices through the
primary path. Filter these out during discovery to avoid showing
ghost enclosures with no drive data.
Parse sg_ses --page=0x02 output to surface enclosure-level health data
including power supply status, fan RPMs, temperature sensors, and voltage
rails. Failed/critical components are reflected in the overview totals
and shown as status pills in the enclosure card header with an expandable
detail panel.
