Root rm -f in drop_symlink could be redirected by a parent-directory swap to
delete arbitrary files as root. drop_symlink and the logs/ symlink sweep now
unlink AS THE CUSTOMER (can never delete anything the customer couldn't), and
drop_symlink still refuses to start if the path is a symlink afterwards; the
pre-daemon logs/ gate re-checks and fails closed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>