Research consolidation (no κ): T74 claim ledger — 95 stated numbers and 82 release gates re-checked; 11 text errors (#2302/#2374/#2435 wrong targets, self-κ in 3 READMEs), all gates pass - #2485

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/