Get data for a specific guide

Retrieves details of a specific guide. While the guide is being created, the endpoint returns 202 (poll again later). If the creation failed permanently (explicit terminal flag, or a failure older than 15 minutes with no retry left, see progressStatus.terminalInferred), it returns 200 with success=false, status=failed, a human-readable French error message, creationFailed=true, refunded (whether the consumed credits were automatically given back) and guide.progressStatus (raw reason, message, terminal, kind, and failureFacts when the figures are known, which is only possible for sources whose web pages we read, that is a search engine or a _CITATIONS source, never a source in answer mode). Stop polling in that case.