Extract validate-skill-tree from the warden workflow into a dedicated
.github/workflows/validate-skill-tree.yml. Keeps concerns separate —
warden handles AI code review, skill tree validation handles structural
integrity. Both trigger on the same PR events but run independently.
Adds a parallel CI job that runs `./scripts/build-skill-tree.sh --check`
on every PR. The job checks out the repo with minimal permissions
(contents: read) and fails if SKILL_TREE.md is stale or any skill
frontmatter/breadcrumb/router-table validation errors are found.
Running it as a separate job (rather than a step in the warden review
job) keeps concerns isolated and lets both jobs run in parallel.
Co-Authored-By: Claude Sonnet 4.5 (Anthropic)
Greg Pstrucha