chore: correct LICENSE copyright holder to UT-Battelle, LLC

Replace the placeholder copyright holder "ornlneutronimaging" with the
correct ORNL attribution, UT-Battelle, LLC (Oak Ridge National
Laboratory), matching the house style used in NEREIDS, ahead of the
DOE CODE / open-source release.

Assisted-With: Claude Opus 4.8 <noreply@anthropic.com>

Author: KedoKudo

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2025 ornlneutronimaging
+Copyright (c) 2025-2026, UT-Battelle, LLC (Oak Ridge National Laboratory)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal