Seed Personal RAG with Playground docs content

[fellyph]

Summary

• Add a generated WXR seed for the WordPress Playground docs so Personal RAG starts with real content on first run.
• Import the seed from both the bundled blueprint and the app blueprint, and register the app in the gallery index.
• Add a generator script to rebuild the docs WXR from the local Playground docs source.

Testing

• Regenerated the WXR and verified it contains 79 posts and 15 categories.
• Validated the blueprint JSON files and the generated XML.
• Ran the Personal RAG blueprint locally in Playground and confirmed the admin page loads with imported content present.

[github-actions]

Test using WordPress Playground

The changes in this pull request can be previewed and tested using a WordPress Playground instance.

WordPress Playground is an experimental project that creates a full WordPress instance entirely within the browser.

Some things to be aware of

• All changes will be lost when closing a tab with a Playground instance.
• All changes will be lost when refreshing the page.
• A fresh instance is created each time one of the links below is clicked.

For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

Blueprint previews

• Open personal-rag in WordPress Playground

[akirk]

What about putting the plugin in your own Github repo and use it from there with a git:directory directive? That would also allow you to iterate on it.

[fellyph]

Thanks @akirk! I will do this. I was first running to see if this was viable, and I will organize it.