Research: deferred target basis — V R = I replaces H5 with the H2 target clause; scatter 527 -> 97 on every committed R439 target-basis word (PR1868's PR1188 word 10,489 -> 10,059) (no new kappa) - #2115

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, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/