doc: Changelog entry

Author: effigies

changelog.d/20251124_080614_markiewicz_bad_qform.md

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+### Fixed
+
+- NIfTI files with bad qform matrices, resulting from non-normalized quaternions,
+  would previously raise a NIFTI_HEADER_UNREADABLE error. Now only the axis codes
+  are disabled, preventing orientation checks, but not raising errors.