Add src/rsync.js as a drop-in replacement for rsyncwrapper, using
child_process.spawn directly. Only implements the options this project
uses. Single line change in rsyncCli.js to swap the import.
BREAKING CHANGE: rsyncwrapper dependency removed, rsync command is now
constructed and executed via a local module using child_process.spawn.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
