docs: add Tart to Usage section#161
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Tart can use socket_vmnet via a drop-in softnet replacement (the SOCK_DGRAM↔SOCK_STREAM pipe approach discussed in lima-vm#13). With this in place, Tart VMs share L2 with Lima VMs on the same socket_vmnet daemon, unblocking VM↔VM communication on macOS Sequoia/Tahoe where the bridge100 PRIVATE flag prevents it natively. Implementation: https://github.com/tannevaled/socket-vmnet-shim Signed-off-by: tannevaled <tannevaled@users.noreply.github.com>
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Summary
Adds a
### Tartsubsection under## Usage, alongside the existing QEMU and Lima sections, pointing readers to a drop-insoftnetreplacement that lets Tart VMs share asocket_vmnetdaemon with Lima VMs.Context
This implements (out-of-tree, as a sidecar binary) the SOCK_DGRAM↔SOCK_STREAM framing pipe that @balajiv113 proposed in #13 and @AkihiroSuda accepted as a reasonable workaround:
The standalone implementation lives at https://github.com/tannevaled/socket-vmnet-shim — ~200 lines of std-only Rust, two threads, ~300 KB binary stripped. It impersonates cirruslabs/softnet's CLI so `tart run --net-softnet ` picks it up unmodified via PATH override. Verified on macOS Tahoe 26.5 with 3 Tart Debian VMs and 3 Lima Debian VMs on the same socket_vmnet shared daemon — full mesh ping, 0% loss.
This PR is just the documentation entry that makes the path discoverable to socket_vmnet users; it intentionally doesn't pull the shim into this repo (the maintenance footprint stays elsewhere unless you'd prefer otherwise — happy to do that as a follow-up if it's of interest).
Test plan