Linux: I very much want to do this, but unfortunately it's lower priority than getting things rock-solid on windows/mac. It's not a gigantic amount of work, but it's not trivial. Hopefully I can do it once things calm down with the Beta.
CLAP: I'm using the JUCE framework for plugin integrations, which doesn't currently support CLAP. But their roadmap says that the next major version will support CLAP, and I will definitely implement that in Anukari. Not sure when JUCE 9 comes out though, it could be a while.