Add session displacement generation - #3231

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: tj-actions/changed-files@v46.0.1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to save: Unable to reserve cache with key setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.11-pruned-f15a593234d55fcf27dae810af7e3b967ccc6046fc3840e46279c1c499759f67, another job may be creating this cache.