Compare two completed audits of one website and get what changed. Defaults to the website's latest completed audit against the one before it; pass base/head run ids to compare any two. Each finding gets one of seven kinds: new, resolved, worsened, improved, unchanged (both audits published it), still_open (still there, but one audit did not list it: the evidence store says it is open although the newer audit did not republish it, or the older audit's capped report sampled it out; sampledOut marks a clipped one, which is never counted as new; a sampled class that fails more often is listed in sampledClassGrowth and still counts as a change), or not_crawled (the page was not visited, so the issue is neither fixed nor still broken). resolutionEvidence says what backed the resolved verdicts; when it is "none" nothing is reported as fixed. Score movement is broken down by category. A website with only one audit returns first_run with an empty finding list; an audit where nothing moved returns changed: false. Unchanged, still-open and not-crawled rows are omitted unless requested.