Declare effects and guard uncertain writes in agent plans - #61

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-node@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/

Unexpected input(s) 'follow-symbolic-links', valid inputs are ['name', 'path', 'if-no-files-found', 'retention-days', 'compression-level', 'overwrite', 'include-hidden-files']