Fix write-skew reader pair selection - #254
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Summary
Restrict the Write Skew reader query to odd starting IDs so that it checks only the logical Person pairs defined by the test:
(2k+1, 2k+2).Without this predicate, the query also examines cross-pair neighbors such as
(2, 3), which are not governed by the pair invariant and can cause false anomaly reports.Closes #253.
Related implementation fix: ldbc/ldbc_acid#16.