Research note (no κ): #2435's entrance raise is a width exchange paid by 72 partner splits; further raises saturate at ≈ +3e-7 (split-free raises worth up to +4.3e-6) - #2453

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, actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/