compressArticle assumed a fixed segment layout [model,cpu,mem,gpu,disk,net,psu,support].
Build() skips empty segments, so without GPU the PSU slot shifted to index 5. Step 2 of
compression called compressNetSegment on the PSU value ("2x1kW") which returned "2xNIC".
Replace positional indexing with namedSeg{group,value} tagged segments; compressArticle
now looks up each segment by group name via findSegGroup(), regardless of array length.
Regression test TestBuild_CompressArticle_NoGPU_PSUNotNIC reproduces the exact config
from OPS-2445 (NF5280M6 + 2xPSU, no GPU) that triggered the bug.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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