Profiling showed the joint Ceres solve took ~120 s versus ~3.5 s for the
alternating per-image scaling loop (~35x) for no quality gain (HEWL
anomalous 0.54x vs 0.53x), so it is not worth keeping. Drop
GlobalScale.{h,cpp}, the jfjoch_process --global-scale flag, and
ScalingSettings::GlobalScaling.
While here, in the same scaling/process area: fold scale_fulls into
ScalingSettings (alongside combine_3d) so the CLI and experiment carry it
uniformly, add per-substep [timing] logging to the scaling/merge post-pass
(including the serial MergeAll vs parallel ScaleAllImages split), and carry
structured MergeStatistics + ISa in ProcessResult.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_f
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