Add Google Antigravity CLI

[liorsh69]

Existing Feature Request

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Summary

Add Google Antigravity CLI as an installable feature in the Kloudkit Workspace Feature Store so users can enable it directly in a workspace with automated installation, PATH integration, version pinning, and basic setup guidance.

Suggested Solution

Create a new feature entry for Antigravity CLI in kloudkit/ws-feature-store that:

• Installs the official Antigravity CLI binary/package automatically
• Adds it to PATH so the CLI is available immediately in the workspace terminal
• Supports version pinning for reproducible environments
• Includes basic auth/setup documentation and a minimal usage example

Additional Context

Antigravity CLI is a terminal-first coding assistant optimized for keyboard-driven and remote SSH workflows, with codebase understanding, multi-step reasoning, multi-file editing, command execution, and persistent history - making it well-suited for Kloudkit workspaces. Kloudkit already maintains a workspace CLI and feature store, so this fits the existing extension model.

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[bdsoha]

@liorsh69

Thanks for the suggestion! I looked into this one and I'm hesitant, for a few reasons:

1. agy CLI is great, but it's a closed-source binary.
2. It forces a Google sign-in on first run (so we can't pre-bake it for anyone), and it self-updates in the background, which defeats the version pinning you mentioned wanting.
3. Antigravity is really Google's IDE platform, the CLI is a fairly new, separate piece, so it's not quite the "terminal-first assistant" the framing suggests.

I'm going to leave this open rather than close it, and I'm happy to revisit.