[recipes] Add Google Antigravity MCP setup guide

[azarianpayam]

Summary

Adds a tested, beginner-friendly recipe for connecting a remote Open Brain-compatible MCP server to the Google Antigravity desktop app.

The guide explains why Antigravity is used instead of the Gemini app, provides a generic remote MCP configuration example, and walks readers through saving and retrieving a test memory.

What it includes

• Generic configuration using placeholders for the Supabase project reference and Open Brain key
• A security warning not to publish keys, tokens, endpoints, or other credentials
• Steps to restart Antigravity and verify that the open-brain MCP server is enabled
• A test capture workflow followed by a read-only memory search
• Expected outcome and troubleshooting guidance

Requirements

• A working Open Brain setup
• A remotely deployed Open Brain-compatible MCP server
• Google Antigravity
• The server’s endpoint URL, required authentication-header name, and a private Open Brain key

Validation

Tested on my own Open Brain instance:

• Confirmed that Antigravity loaded the remote MCP server
• Confirmed that a test memory could be saved through the MCP server
• Confirmed that the same test memory could be retrieved with a read-only search
• Removed personal endpoint values, credentials, local paths, and identifying screenshots from the contribution

[github-actions]

Hey @azarianpayam — welcome to Open Brain Source! 👋

Thanks for submitting your first PR. The automated review will run shortly and check things like metadata, folder structure, and README completeness. If anything needs fixing, the review comment will tell you exactly what.

Once the automated checks pass, a human admin will review for quality and clarity. Expect a response within a few days.

If you have questions, check out CONTRIBUTING.md or open an issue.