I maintain trigger-tree, an open source Claude Code plugin that logs which project docs the agent actually opens (all local no tokens). I built it after finding out most of my carefully written docs sometimes seemed to be ignored by AI...
Today I added a CI gate which checks whether your docs are reachable at all listed in their folder index, linked from somewhere, folders have an entry point, et cetera.. Plain Python over the file tree, no AI, same result on every machine, so you can fail a PR on it. Findings export as SARIF, so they land as annotations on the PR diff.
You can find it on the GitHub Actions marketplace (search "trigger-tree") or pip install trigger-tree and also add the plugin from Claude or Codex..