Adds ampere (CUDA compute capability sm_86) to both the build-neuron and package-neuron matrices, so helexa-neuron-ampere RPMs are built and published alongside helexa-neuron-ada and helexa-neuron-blackwell. The prerelease spec already lists ampere in its Conflicts: clause, so no spec change is needed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>