Extends the ranking router's roundEvaluationScores response with
per-juror grading stats (mean, stddev, count) plus the round's overall
mean/stddev. The side-sheet juror rows render 'typical X.XX →
contributes Y.YY' next to each Score badge whenever balanced is on,
making the z-rescaling visible per individual rather than only as a
project-level number.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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