Every version, and what it changed for you.

Google Antigravity joins the supported agents, and the skill installs wherever it is read.

• NewGoogle Antigravity is supported on both axes. chi agents on antigravity connects Archis to it, chi run --agent antigravity drives it, and the briefing and the on-demand skill go where Antigravity reads them — which includes Antigravity Desktop and the IDE extension, since those read the same files whether or not you ever installed the command-line tool. The command answers to agy as well, because that is what you type.
• NewThe support table marks Antigravity as not measured, and means it. Its entry is built from the vendor's documented command-line interface rather than from a conformance run against the real binary, so it claims no pass rate on either axis. Run chi agents check antigravity and chi agents check antigravity --driver on a machine that has it and you get the numbers yourself.
• ImprovedThe Archis skill now installs into every agent on your machine that reads one, instead of the first. chi skill install, refresh, uninstall and status all work across them: a copy you wrote yourself is reported at the end rather than stopping the rest, a stale copy is no longer missed because another one was fixed first, and status lists every path instead of one. Where you have no agent skills directory at all, Archis still writes exactly one — it will not create directories for agents your machine has never run.