This site is always under construction.
Things tend to evolve slowly here, without much ceremony.
CATAI could plausibly be an acronym.
Various backronyms have been proposed, none of them authoritative:
Completely Arbitrary Technical Abbreviation Initiative
Cautiously Assembled Things, Almost Integrated
Configuration Attempts That Are Incomplete
In practice, it behaves more like a placeholder for things that are still converging — which, for now, is accurate enough.