Add com.unity.ide.antigravity (Antigravity IDE Unity integration) to Editor

[BadranRaza]

Adds a single entry to the ### Editor section under ## Open Source Repositories:

• com.unity.ide.antigravity - Unity Editor integration for Google Antigravity IDE (the VS Code-based code editor split off from the standalone Antigravity 2.0 agent app at I/O 2026). Detects the IDE vs the agent app via resources/app/package.json manifest verification.

Context

Google split the Antigravity product line at Google I/O 2026 (May 19, 2026) into a standalone agent-orchestration app (now called "Antigravity") and a separate VS Code-fork code editor ("Antigravity IDE"). Most community Unity packages discovering Antigravity match any Antigravity*.exe, so on machines with both products installed Unity often opens the agent app on every script double-click — which has no editor surface and just shows the agent home screen.

This package fixes that by reading resources/app/package.json and only accepting installs whose product name is exactly Antigravity IDE.

• MIT-licensed, Unity 2019.4+
• Latest release: v1.0.8 (May 23, 2026)
• Deep-dive on the bug + fix: https://github.com/BadranRaza/com.unity.ide.antigravity/blob/master/Documentation~/antigravity-2-0-fix.md

Happy to tweak the description / placement if needed. Thanks for maintaining this list!