docs: changelog for the lattice-search and two-pass symmetry fixes

Both are user-visible: a centred lattice whose reduced beta sits on the Niggli type boundary keeps its centring, and the second rotation pass reuses a group that came from the centred-lattice test instead of re-deciding the symmetry at the refined geometry. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-12 18:38:03 +02:00
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 ### 1.0.0-rc.161
 This is an UNSTABLE release. It includes many experimental features, as well as many AI generated fixes. We recommend using rc.152 for production use.

+* Lattice search: a reduced cell whose β sits on the Niggli type boundary now keeps its centring instead of falling through to triclinic, so a centred lattice is no longer read as primitive according to which way its refined cell happened to reduce.
+* rugnux: The second rotation pass now reuses a space group that came from the intensity-based centred-lattice test, as it already did for every other group, instead of re-deciding the symmetry at the refined geometry.
 * Space-group search: where the search on the well-measured observations (`--search-min-zeta`) and the search on all of them disagree, the answer is now always the one the merge of all the observations supports, instead of whichever of the two found more symmetry.
 * Scaling: rotation merging now also fits a correction surface over **rotation angle × detector position**, which reaches the absorption left behind when the diffracting volume drifts through the beam; like the other surfaces it is cross-validated and applied only where it improves reflections it was not fitted on.
 * Scaling: the rotation correction surfaces (decay, absorption, detector-plane modulation) no longer pull each cell's factor towards zero in proportion to that cell's own noise, which had put a spurious centre-to-edge ramp on runs whose outer resolution shells carry no signal.