TtsVoicesCollector
Passive collector for SignalCategory.InstalledVoices.
Reports the installed TTS engine count and labels, the default engine and the set of installed voice locales via PackageManager.queryIntentServices, Settings.Secure and a short-lived TextToSpeech probe.
Privacy: the installed-voice/engine inventory expands the speech fingerprint surface; individual voice names are not enumerated. No runtime permission required.