New `--rm` flag deletes the VM once the ssh session or `-- cmd`
exits, making `vm run` one-shot. Exit code from command mode still
propagates correctly.
Semantics:
- Create fails → no VM to delete, nothing to do.
- SSH-wait timeout → VM intentionally kept alive so `vm logs <name>`
shows why; the timeout error already pointed users at that. Even
with --rm, this path skips delete — a wedged sshd is exactly when
you want post-mortem access.
- Session/command ends (any exit code, any reason) → VM is deleted
via `vm.delete` RPC. Uses a fresh 10s context so Ctrl-C during the
session doesn't abort the cleanup.
New vmDeleteFunc seam at the top of banger.go alongside the other
RPC seams. Two tests cover the happy path (session ends cleanly →
delete fires with correct ref) and the skip-on-timeout path (ssh
wait errors → delete does NOT fire).
README updated with an ephemeral example and a note about the
timeout-skip behaviour.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Thales Maciel
b33f24865c