Add Antigravity (agy) as a third agent backend for gemini-* models

README.md

@@ -1,6 +1,6 @@
 # byre
 
-A server and macOS app for running many coding agents (Claude Code and Codex) in parallel on your own Mac, each on its own branch, with a lead agent that keeps track of them for you.
+A server and macOS app for running many coding agents (Claude Code, Codex and Antigravity) in parallel on your own Mac, each on its own branch, with a lead agent that keeps track of them for you.
 
 ## Features
 
@@ -20,12 +20,12 @@ A server and macOS app for running many coding agents (Claude Code and Codex) in
 
 ## Requirements
 
-macOS, [Tailscale](https://tailscale.com) on every Mac, and on the Mac that runs the server, `git`, the `claude` and `codex` CLIs, Node.js (agents' Playwright browser tools run through `npx`) and Google Chrome (`brew install git node --cask google-chrome`). Identity comes from Tailscale: byre only serves requests that arrive through `tailscale serve`.
+macOS, [Tailscale](https://tailscale.com) on every Mac, and on the Mac that runs the server, `git`, the `claude` and `codex` CLIs (and for Gemini models the Antigravity CLI, `brew install --cask antigravity-cli`, signed in once by running `agy`), Node.js (agents' Playwright browser tools run through `npx`) and Google Chrome (`brew install git node --cask google-chrome`). Identity comes from Tailscale: byre only serves requests that arrive through `tailscale serve`.
 
 ## Installing
 
 1. Download the latest `byre-<version>.dmg` from [the releases page](https://g.fc.run/ai/byre/releases) and drag `Byre.app` to Applications, on every Mac you'll use byre from.
-2. On the Mac that runs the server, from a terminal whose `PATH` finds `claude`, `codex`, `git` and `npx`:
+2. On the Mac that runs the server, from a terminal whose `PATH` finds `claude`, `codex`, `agy`, `git` and `npx`:
 
    ```
    /Applications/Byre.app/Contents/Helpers/byre install