Add configurable judge rubrics and multi-dimensional scoring with
weighted aggregation. New config fields: judge_criteria (free text)
and judge_dimensions (list of {name, weight, description}). CLI
--judge-criteria flag provides quick overrides. The judge adapter
computes weighted aggregate scores and enriches feedback with
per-dimension breakdowns.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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