updateLocalEntry set the RemoteEntry and dropped the rename marker on the
caller's entry before the RPC. A transient stamp failure retries the same
event in place, which then read as already synced and skipped both the
upload and the stamp. The stub filer now applies a successful update the
way the filer does, since tests had relied on that shared object.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>