Adds board and memory parser test fixtures based on real dmidecode output
from Dell PowerEdge R740xd, HPE ProLiant DL380 Gen10, and Supermicro
SYS-6028R-WTR sourced from the linuxhw/DMI dataset. Extends cleanDMIValue
with four additional vendor placeholder strings found in the dataset:
"0123456789", "1234567890", "NOT AVAILABLE", and "TO BE FILLED BY O.E.M"
(without trailing dot). Adds memory_test.go covering mixed populated/empty
DIMM slots and both GB and MB size formats.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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