feat(dcu-kernel-auto-opt): harness planner, gate policy and DKAO tooling - #36

Cache folder path is retrieved for pip but doesn't exist on disk: /home/runner/.cache/pip. This likely indicates that there are no dependencies to cache. Consider removing the cache step if it is not needed.

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/