readInside opens O_NONBLOCK|O_NOFOLLOW and checks the open descriptor before reading, so a FIFO is refused at once and holds no filesystem thread. work/ is a slot in the recipe; a daemon that holds the state root creates it and removes stale export-XXXXXX directories from it, nothing else, before it serves.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>