Deleting a simulator runtime auto-deletes its dyld cache too

On macOS, xcrun simctl runtime delete <id> also removes that runtime's dyld shared cache under /Library/Developer/CoreSimulator/Caches/dyld/<build>/, so the real reclaim is runtime size + ~3GB extra. Also: brew uninstall --cask can fail in non-interactive shells because the cask's uninstall stanza invokes sudo; if the target dirs are user-owned, rm -rf the install dir and the Caskroom/<cask> entry directly and brew stops listing it. Before deleting an "unused" root-owned tree, note rm -rf may have already emptied world-writable contents and only failed on the top dir — check du before retrying with sudo.