remove one Vec from Tensor - #31

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

trend baseline is stale: file=benchmarks/trend-baseline-runtime.tsv latest_timestamp=2026-06-05T22:14:06Z age_days=71 max_age_days=14