Docker Desktop on Mac: unwedge a hung VM, then prune; Docker.raw shrinks on its own

Docker Desktop's VM had been at ~200% CPU for 5 days and every docker CLI call hung. The fix: osascript -e 'quit app "Docker"' stops the Virtualization VM, but com.docker.backend processes linger. Kill them with pkill -f /Applications/Docker.app/Contents/MacOS/com.docker (and -9 if needed), then open -g -a Docker to relaunch in the background; docker info answered after about 10 s. docker system df then showed 13.7 GB of build cache, 25 GB of images and 18 stopped containers. docker builder prune -af plus docker image prune -af --filter until=168h (images older than a week) plus removing exited containers cut Docker.raw's real size (check with ls -s, not ls -l) from 42 GB to 21.5 GB within about 20 s, with no manual compaction. Caveat: restarting Docker stops every running container, so check docker ps first and restart anything that was in use. Side note: ~/.mintlify was 2 GB, of which 1.7 GB was the previews cache that mint dev builds per docs project and never cleans up; the CLI itself was 347 MB.