CragVS Code extension

Only if you ask it to. By default the review appears in the editor and nowhere else, so nothing you are still thinking about is posted where colleagues can read it.

Yes. One licence covers you on every machine and every repository, at work or at home. Your employer does not need a separate one for you.

Only the diff you are reviewing, and only when you ask for a review. Nothing is stored after the review is returned, and nothing is used for training. Repositories you mark private in settings are never sent at all.

TypeScript, JavaScript, Python, Go, Ruby, Swift and Rust properly. Anything else gets a general review that is honest about being general.