Positron, and Cursor.AI are VS Code-based, so I assume VSCode Julia extension already works there, and all the other VS Code forks.
Other options are Zed and Pulsar editor I just discovered, both I believe based on Atom (the Zed people made Atom). Julia’s Atom-based Juno IDE is barely on life-support, merged into VS Code Julia extension. I think the extension is written in JavaScript, and Atom, and presumably Zed, use it too, and might have similar (but different) extension mechanism? Before spending a lot of money on the extension, I would want to know if needs or can support other IDE/editors, like Zed, and what would be the ideal to support if you has a choice?
This seems most up-to-date for Emacs: GitHub - gdkrmr/lsp-julia
Julia support for the =lsp-mode= package using the LanguageServer.jl package. For information on the features
lsp-mode
provides see their git repository.