knowledge: consolidate 30 open flush PRs (#47–#110) into one reconciled state — 53 new pages, 51 amended - #112

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