Sleeper now exposes the full `/usr/bin/wakeonlan -i <broadcast> <mac>`
invocation as wol-sleeper/waker_command; waker reads that instead of
rebuilding the command line itself. Adds the `-i <subnet-broadcast>`
flag so magic packets reach sleepers on a different L2 segment than
the waker.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>