jetpack-mu-wpcom: add AI Launchpad cross-stream contract files

[Copons]

Fixes DOTOBRD-458

Proposed changes

• Add src/features/ai-launchpad/contracts/agent-output-schema.json — the JSON Schema for the AI Launchpad's AI output shape (tasks, inferred, first_post_draft). This is the cross-stream contract: the upcoming tailor.ts validates model responses against it at runtime, the REST endpoint validates PUT /tailored bodies against it server-side, and Jest/PHPUnit suites assert against it.
• Add src/features/ai-launchpad/contracts/eval-fixtures.json — six fixture cases (one per onboarding goal) used by prompt evaluation and manual smoke testing.
• No runtime behavior change: nothing loads these files yet. Committing them first so that all upcoming AI Launchpad branches (and CI) can reference them by path.

Related product discussion/links

• https://linear.app/a8c/project/replace-launchpad-with-ai-tasks-ab1b5ad16d4c

Does this pull request change what data or activity we track or use?

No.

Testing instructions

• Confirm both files parse as valid JSON: node -e "['agent-output-schema.json','eval-fixtures.json'].forEach(f => JSON.parse(require('fs').readFileSync('projects/packages/jetpack-mu-wpcom/src/features/ai-launchpad/contracts/' + f)))"
• Confirm the schema is a valid JSON Schema draft-07 document (fields: $schema, $id, type, required, properties).
• No code references these files yet, so there is nothing else to exercise — CI passing is sufficient.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (WordPress.com Site Helper), and enable the add/ai-launchpad-contracts branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack-mu-wpcom-plugin add/ai-launchpad-contracts

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

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[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report