Qwen3.5/3.8 on CUDA: decode 37-73% faster on #836's engine, bits unchanged (on #836) - #978

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, mlugg/setup-zig@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/