Description

Add documentation for Google Antigravity IDE integration in the web IDEs documentation. Support for Antigravity was recently added in PRs #20873 (protocol support) and #21068 (icon), but there's no user or admin documentation explaining how to configure it in templates.

Documentation needed:

1. Add Antigravity section to /docs/user-guides/workspace-access/web-ides.md (user guide)
2. Add Antigravity configuration example to /docs/admin/templates/extending-templates/web-ides.md (admin guide)

What to document:

• What is Google Antigravity IDE (brief intro - Google's cloud-based IDE)
• How to configure it as a coder_app in templates
• Required protocol: antigravity://
• Icon reference: /icon/antigravity.svg (built-in icon available)
• Any specific URL patterns or configuration needed
• Example template code

Related IDEs documented: The web-ides.md files already document code-server, VS Code Web, Jupyter, JupyterLab, RStudio, and Airflow - Antigravity should follow a similar format.

Impact

Without documentation:

• Users won't know that Antigravity IDE is supported in Coder
• Template administrators won't know how to configure Antigravity for their workspaces
• The new feature (protocol and icon support) won't be discoverable or usable

This affects users who want to use Google's new Antigravity IDE with their Coder workspaces.

Links

• PR adding protocol support: chore: add support for antigravity external app protocol #20873
• PR adding icon: feat: add google antigravity ide icon to theme #21068
• Related registry module PR: feat: add Antigravity IDE module registry#558
• User guide (needs Antigravity section): https://github.com/coder/coder/blob/main/docs/user-guides/workspace-access/web-ides.md
• Admin guide (needs Antigravity example): https://github.com/coder/coder/blob/main/docs/admin/templates/extending-templates/web-ides.md
• Thread where this request originated: https://codercom.slack.com/archives/D0A1DVC2B8S/p1764966124382669