feat: load epoch schedule from genesis.bin for warmup-aware epoch math - #51

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02, arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b, mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29, Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/