Wait for Data Machine bundle results

[chubes4]

Summary

• Request the new Data Machine datamachine/run-agent-bundle final-result mode by setting wait_for_completion: true.
• Forward optional step/time budgets to the Data Machine bundle runner.
• Update the WordPress plugin smoke coverage to lock the canonical request shape.

Dependencies

• Depends on Allow agent bundle runs to return final engine data Extra-Chill/data-machine#2514 for the public final-result contract.

Testing

• npm run build
• npm run wordpress-plugin-smoke
• git diff --check

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (openai/gpt-5.5)
• Used for: Investigated the Data Machine bundle execution boundary, updated WP Codebox to request the canonical final-result contract, and ran targeted verification. Chris remains responsible for review and merge.