Drops the --reject-delta-cchalf flag and MergeOnTheFly::DeltaCChalfReject.
The CLI value was parsed but never consumed (the method had no call site), so
the flag was already a no-op. Wiring it up and testing against an external
reference (7O8F) showed it is confirmation bias: on a spurious-crystal flood it
raised internal CC1/2 while CCref (correlation to the true structure) fell, and
it never improved R_meas. The merge weights are already correct; per-crystal
merge-side rejection has no genuine lever here.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
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