Targets the mutants that survived the first fix run: need arithmetic of cut
and full windows, the reserve for the not-expanded line at the budget edge,
the left-reserve >= 4 threshold with two windows, the exact more-lines
note, the blank line after the table, a non-sha base never echoed in the
header, and a spec without a base refused rather than crashing.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Eureka
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