Add README.md explaining the network transparency role of the mount
package. Replace 'kept as a convenience' comment with one that explains
why it exists and how it differs from local 9pfuse.
The FUSE-based 9P mount (mount/) was unused — all actual mounting
uses 9pfuse via ollie-remount. Remove the package, the olliesrv mount
subcommand, and the go-fuse dependency.
Ollie Agent