Promote the per-observation merge outlier rejection from the temporary PR_REJECT
env knob to a real setting: ScalingSettings::OutlierRejectNsigma (default 6, <=0
disables), driven into MergeOnTheFly via the constructor, with a --reject-outliers
CLI flag in jfjoch_process. Default-on at 6 sigma matches XDS (MISFITS/REJECT) and
DIALS (normalised-deviation test); it validated on the full-jet R-free (0.2625 ->
0.2585). Applies to both the PixelRefine and classical merge paths.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
6f733d74c2