Adds a doc comment to parseBridgeAudioRoute clarifying that both
iOS and Android producers (IOSAudioLifecycleController.classifyDevice
and AndroidAudioLifecycleController.classifyDevice) emit exact
PascalCase strings.
Case variants (USB_HEADSET, usb_headset, UsbHeadphone) fall through
to unknown by design. This is a silent failure mode worth documenting
so future changes to either platform classifier are paired with a
parser update.
Per PR #28 review feedback.