It's not an IDE, it's a way to run agents. In particular, the Antigravity CLI positioned as Gemini CLI's successor is a shell with superpowers, not something you would use for code development.
You proved the point. Gemini has been marketed better, such that even folks in the know confuse Antigravity (the IDE) with anything else attempting to be pushed.
Antigravity CLI was only announced yesterday, so pretty much no one realizes it's different from Antigravity IDE yet, but I agree with your overall point. This kind of branding is toxic for individual product awareness. I'm not sure what drives the thinking behind it; Microsoft does it too (Copilot, etc.).
I don't think so? Gemini CLI (RIP) was more of a direct competitor to Claude Code - a CLI based coding agent. Antigravity was more IDE-like, based around a VS Code fork (so more like Cursor). Antigravity CLI, per the name, seems to be positioning it as a replacement for Gemini CLI, so certainly(?) a Claude Code CLI-based coding agent, but now one with multi-agent support and some sort of server-side harness as well apparently, doing who knows what.
Any CLI-based coding agent can equally well be described as "a shell with superpowers", and people were using Claude Code for non-coding tasks (e.g. sysadmin) before OpenClaw appeared and made that it's main purpose.