Python validator derived from READ, WRITE, DO, and Entry. Enforces
frontmatter shape, required sections, knowledge-file length and
no-code-blocks rule, sample-sibling naming (<slug>.good.al /
<slug>.bad.al), action-skill section ordering, and unique skill ids
per kind. Runs in GitHub Actions on PRs and pushes to main; emits
GitHub annotations when GITHUB_ACTIONS is set, plain text otherwise.
Warnings do not fail the build.
Passes cleanly against the existing microsoft-layer corpus.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
