Noether v2026.4.0 opens AB-UPT to any number of named domains and adds heat-sink and wing recipes

Emmi AI releases Noether v2026.4.0, the first version under calendar-based numbering. AB-UPT no longer has a fixed surface and volume split: a `ModelDataSpecs` dictionary lets it take any number of named domains (gas, liquid, solid, multi-phase), and new untied physics blocks give each branch its own weights. New recipes cover DrivAerML end to end with query-based inference, the SIMSHIFT Heatsink benchmark (819 simulations; velocity, temperature and pressure on 3D volume fields, with AB-UPT or Transolver++) and a subset of the Emmi-Wing dataset on Hugging Face. Emmi says RoPE scaling and the Muon optimiser improve its AB-UPT baseline on DrivAerML; the release notes link a Weights & Biases report and give no figure. Muon support splits the attention weights, so earlier AB-UPT checkpoints do not load.

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