configure_offline_output still routed the -o prefix through FilePrefix (the
CheckPath guard), so 'rugnux -o /abs/path' threw 'Path cannot start with slash'
before processing even though the writer path already supported it. Use the
trusted setter here too. Completes the offline absolute-path support (the writer
and Rugnux::Run already skip the guard); the .mtz/.cif and _process.h5 now land
at an absolute -o. The --scale path shares this function and writes via
WriteReflections (no FileWriter), so it is covered as well.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
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