The merged reflections were written in one of mtz/cif/txt selected by
--scaling-output. Write both an MTZ and an mmCIF unconditionally instead - each
has its uses downstream (MTZ for the CCP4/phenix tools, mmCIF for deposition) -
and remove the format selector, the plain-text .hkl writer, and the now-unused
IntensityFormat enum / ScalingSettings::FileFormat plumbing.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>