The platform coverage gate runs only TestAllShortcuts and
TestCrossPlatformCoverage*, so several changed statements had no platform
test exercising them:
- drive_pull.go: the smart-policy re-check that skips publication when the
target is refreshed in place (same inode) while the download is running.
- drive_pull.go: the post-publish verifyParent failure, where the result is
already on disk and must not be rolled back.
- drive_replace_unix.go: rename(2) replacement of an existing target; the
Windows side already had the symmetric test.
- drive_status_windows.go: the filepath.Clean rewrite guard had no input
reaching it, because isSafeRemoteSegment filters separators upstream.
macOS changed-code coverage: 99.8053% -> 100.0000% (1541 statements).
chichuan