drop orphaned external-data sidecar (canonical wespeaker_resnet34_lm.onnx is now the single-file packed form)

promote packed single-file form as canonical wespeaker_resnet34_lm.onnx; drop external-data sidecar (CoreML EP cannot relocate external initializers)

initial bundle: segmentation-3.0 + wespeaker_resnet34_lm (3 forms) + PLDA weights, with attribution

initial commit