[solo applicant] customize scoring weights and watch scores recalculate without re-evaluating

Proof set for Score job (user customizes weights mid-flight)

Pin G3 score: the default scoring config produces a valid 0-10 score for any evaluated job; adding a custom column flows through settings.update and gets fed into the weighted score; weight changes recompute the aggregate per the workspace's aggregation mode; a boolean K.O. criterion with penalty 0 hard-zeroes the aggregate score regardless of other dimensions.