Matt 982d5193c5
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feat: surface juror-balanced scores and AI calibration advisory
Adds a shared juror-balancing utility (z-score normalization per juror,
rescaled back onto the raw 1-10 scale) and wires it into:

- Admin reports page: Top-10 project table now shows "Raw Avg" and
  "Balanced" columns side by side, and the summary stats row shows a
  balanced-average tile. Sort defaults to balanced so harsh and lenient
  graders no longer skew the ranking.
- Ranking dashboard: each project row shows a green/amber balanced-score
  chip next to the raw average when the two differ by ≥0.05, making it
  obvious when juror calibration moved a project's effective ranking.

Also adds AI Juror Calibration Advisory — a mutation that takes
anonymized per-juror stats, calls OpenAI, and produces a plain-language
explanation of the cohort's grading patterns plus per-juror severity
(normal / notable / outlier) with a one-sentence narrative. The advisory
describes the statistical balance that already runs; it does not
introduce a new weighting layer. Rendered as a panel in the Juror
Consistency tab when a specific round is selected.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-24 16:19:00 +02:00
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