feat(vmgui): GUI launcher command, VMX optional

Add top-level `vmgui` to open the VMware Workstation GUI (renamed from the
earlier `vm open`). --vmx is optional: with it the GUI opens that VM, without
it the GUI starts bare. Power-on/fullscreen flags ignored (with a notice) when
no VMX is given. Needs an X display — sudo -u ci-runner strips $DISPLAY, so
--display / xhost; see runbook §4.7. 9 tests; suite green ≥90%.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ci_orchestrator/__main__.py

@@ -23,7 +23,7 @@ from ci_orchestrator.commands.retention import retention
 from ci_orchestrator.commands.smoke import smoke
 from ci_orchestrator.commands.template import template
 from ci_orchestrator.commands.validate import validate
-from ci_orchestrator.commands.vm import vm
+from ci_orchestrator.commands.vm import vm, vmgui
 
 # Re-export so legacy A1 tests that patched ``cli_module.<name>`` keep working.
 from ci_orchestrator.commands.wait import (  # noqa: F401  (intentional re-exports)
@@ -54,6 +54,7 @@ cli.add_command(bench)
 cli.add_command(smoke)
 cli.add_command(validate)
 cli.add_command(creds)
+cli.add_command(vmgui)
 
 
 if __name__ == "__main__":  # pragma: no cover