Advance Docs Agent producer chain

[chubes4]

Summary

• pin the Agents API consumer workflow to merged Docs Agent revision 06a7e92e0f4d265d09bbdb6dae1ec78fd8e7c825
• advance the checked producer schema to WP Codebox v0.12.29 at bc982947ec33c78160125026e16d357b7ece3ea1
• align the executable cross-repository contract and contributor documentation with the complete producer chain

How to test

1. Check out Docs Agent at 06a7e92e0f4d265d09bbdb6dae1ec78fd8e7c825.
2. Check out WP Codebox at v0.12.29.
3. Run DOCS_AGENT_DIR=/path/to/docs-agent WP_CODEBOX_DIR=/path/to/wp-codebox php tests/docs-agent-native-workflow-contract.php.
4. Run composer test.
5. Run php tests/no-product-imports-smoke.php.
6. Run actionlint .github/workflows/*.yml.
7. Run git diff --check origin/main...HEAD.

All checks pass locally. A hosted Docs Agent dispatch from this branch will be linked after completion.

Compatibility

The consumer workflow inputs, output behavior, permissions, writable paths, verification commands, drift checks, secrets, and canonical documentation branch are unchanged. This updates immutable producer versions and their checked contracts only. No Agents API runtime or public PHP behavior changes.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode with OpenAI GPT-5.6 Sol
• Model: openai/gpt-5.6-sol
• Used for: Advanced the pinned producer chain, updated deterministic contract coverage and documentation, and ran the full verification suite. Chris reviewed and owns the change.