NVIDIA NeMo Evaluator 0.1.84

feat(exporter): stream logs via tar+ssh (#730)

## Summary

- **fix(exporter):** Replace `scp -r` with `tar+ssh` for log downloads —
streams compressed logs directly, avoiding downloading unwanted
subdirectories entirely
- **docs(skills/nel-assistant):** Add `--no-cache-dir` guidance for pip
in `pre_cmd` to avoid cross-device link errors when pip cache and temp
dirs are on different filesystems inside Docker containers

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Signed-off-by: Piotr Januszewski <pjanuszewski@nvidia.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>