feat(BACKEND-TENSTORRENT-KEEPQUANT): the 27B fits — packed GDN projections, int8-dot captured decode, per-request logits gather (#3042) - #3183

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. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/