Summary

• pin Docs Agent to accepted WP Codebox PR #1890
• preserve the existing v0.12.29 packaged runtime release
• validate the exact reusable-workflow producer revision in CI

This producer exposes bounded failed-command diagnostics and applied patch/change evidence needed to diagnose completion-contract failures from GitHub Actions artifacts.

How to test

1. Check out WP Codebox 0227ca7551d8cd98f14242b31e142b50f78dff13.
2. Run php tests/validate-docs-agent-packages.php.
3. Run php tests/validate-external-native-package-sources.php.
4. Run php tests/validate-docs-agent-completion-contract.php.
5. Run WP_CODEBOX_DIR=/path/to/wp-codebox php tests/validate-wp-codebox-run-agent-task-contract.php.
6. Run php tests/repair-docs-links-smoke.php and actionlint .github/workflows/*.yml.

Compatibility

This changes only the immutable reusable-workflow producer pin. The packaged runtime remains v0.12.29 and no consumer input is removed or renamed.

Depends on Automattic/wp-codebox#1890
Relates to #166

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode with GPT-5.6-sol
• Used for: Updated provenance pins and verification fixtures with Chris reviewing and owning the change.