E1004 / dual-controller panels: pin bb_epaper upstream, replace the fork shim with a runtime-gated bufferless module - #147

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/