feat(WordRAM): framed backends - frames, products over one memory, allocation - #2283

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/

Not declared at the PR head: `A.alloc`, `A.Pre`, `A.init`, `Realizes.product_exec`, `Realizes.sum`, `realizes_allocPair`. Advisory only; see the job summary.