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Issue:
Deepgram transcriber makes the task manager stuck in callee speaking forever, leading to WAIT status for every audio chunk.
Cause:
On SpeechStarted events which are generated indepedently from the normal transcript flow (ref: Deepgram docs), the existing interim transcript would be dropped. This caused an issue as VAD events are highly unreliable and often false positives.
Fix:
Perform turn tracking via yielded transcripts rather than relying on SpeechStarted.
Note: This PR also removes a few unused attributes across transcribers.