Docs already said any module or app could publish bread.command.<app>.<verb>,
but command is reserved so both unsourced bread-emit and sourced App emit
rejected the whole namespace. Keep command unclaimable as an app id; accept
bread.command.<known-app>.<verb> (and let an app command another known app).
Also ship bread-emit and bread-module-host, and give udev enumerate the same
classification fields as a live add so boot-time devices are not all unknown.
Out-of-process modules timed out with "did not report ready within 45s"
because apply_sandbox never allowed the child to reach breadd's Unix
socket. Path-based AF_UNIX connect is mediated as filesystem access, so
without a rule for the socket (and its parent) UnixStream::connect failed
with EACCES and the hello handshake never completed.
Pass socket_path into apply_sandbox and add baseline ReadDir/ReadFile
rules for the socket directory and path, matching the existing module-
directory grant. Update unit-test call sites accordingly.
