Fix cmd_probe: instantiate VoiceBackend before probe()

scripts/freestream.py

@@ -259,7 +259,7 @@ def cmd_probe(args) -> int:
         "platform": _platform.system(),
         "machine": _platform.machine(),
         "drivers": sorted(list_drivers()),
-        "voice": VoiceBackend.probe(),
+        "voice": VoiceBackend().probe(),
         "fidelity_rung": select_rung(prefer_gpu=not args.cpu_only).name,
         "gpu": probe_gpu(),
         "exit_code_meanings": {