feat: add p99 and std dev columns to performance stats (#77)#97
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Extends the stats table with a 99th-percentile and population standard deviation column; both are sortable. High std dev flags inconsistent jobs worth investigating — completes v1.1 Error Intelligence milestone. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
p99andstddev(population standard deviation) tobuild_statsinStatsControllerSORTABLE_COLUMNS— sortable via?sort=p99/?sort=stddevstddevreturns0.0for single-execution jobs (no meaningful variance)Test plan
/stats— p99 and Std Dev columns appear in the tablebundle exec rakepassesCloses #77
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