Covers all nine stress cases from #25, #15 and #16. The lowest bid is
disqualified on two missing health documents and the highest bid is
strongest on the SFA's own geographic-preference criterion, so a ranking
that cannot represent absence gets the field exactly backwards.
Deliberate traps: a planted $400 arithmetic error in a stated total, an
unverifiable total whose unit price lives only in the external Excel, an
unlabelled exception, a non-priceable exception that is really a conditional
withdrawal, and an answered-but-negative response.
Second schema finding, surfaced by the validator: R-B6C is a mandatory gate
that no response document can establish. Coverage over it is unknowable
rather than absent.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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