chat.yakka.getSession

Who the caller is signed in as. The session cookie carries an opaque id and nothing else (ADR 0034 §2), so this is how a client learns its own DID — it cannot read one out of the cookie, by design. Answers 200 with `signedIn: false` rather than 401 for an anonymous caller: not being signed in is an ordinary state of the application, not an error in the request.