## Why
Freshly copied executables can briefly remain busy on Linux CI workers, causing packaged daemon tests to fail at launch.
## What changed
Retry the command launch in `packaged_daemon_launch` up to twice on `std::io::ErrorKind::ExecutableFileBusy`, waiting 10 ms between attempts. Other launch errors still propagate immediately.
GitOrigin-RevId: afb6213173a7ae4bcfe2e1e6fab6ced65ab5bf77