Docs: 0.1.3 version refs, check count, what the 0.1.3 recording verified, event-handler patches in the session guide (PL8, PL7) - #4

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/