Add agy (Google Antigravity CLI) as a supported default agent

[SisuAika]

Google's coding-agent CLI has moved from gemini (npm:@google/gemini-cli) to agy (aqua:google-antigravity/antigravity-cli, "Antigravity"). Omarchy's agent picker (omarchy-default-agent) and launcher (omarchy-agent) only support a fixed list: pi, omp, opencode, claude, codex, grok, gemini, copilot, crush.

Requesting agy be added as a supported agent option (menu entry, omarchy default agent agy, and a launch case in omarchy-agent with the appropriate non-interactive/auto-approve flag), so it can replace gemini as the Google-agent choice going forward.

mise already has the package indexed: agy aqua:google-antigravity/antigravity-cli.

[flipyou]

#4481 (reply in thread)