[WIP] docs: create .mcpb bundles for the MCP servers

[reidbarber]

Creates MCPB bundles for the React Spectrum (S2) and React Aria MCP servers. This allows them to be more easily installed in apps such as Claude Desktop: https://www.anthropic.com/engineering/desktop-extensions

Marking as WIP because I'm still figuring out if this is the best solution. One downside of installing via this method is that you there's no way to guarantee you're using the latest server unless you re-install.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Download the bundles and install in Claude Desktop to test them.

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[snowystinger]

more? also, we're on node 24, will that be an issue?

[reidbarber]

I guess @anthropic-ai/mcpb isn't strictly required for this, but I opted to use it for the packing and validating steps in the script. We can technically do this ourselves but I wanted to cut down on the script contents.

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs