Copied from the registry package lsatan/SmartRC-CC1101-Driver-Lib@2.5.7
(upstream unmaintained since 2021) so it can be fixed for Arduino 3.x in
the next commit. This commit is the untouched copy, so that diff shows
every change. Licence: LICENSE.txt ("permission to modify and publish").
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
