fix(agents): persist _speech_start_time across intra-turn VAD bursts#5585

AlessandroElyos wants to merge 5 commits intolivekit:mainlivekit/agents:mainfrom

AlessandroElyos:alessandro/speech-start-time-persistenceAlessandroElyos/agents:alessandro/speech-start-time-persistenceCopy head branch name to clipboard