feat: upgrade to LiveKit Agents SDK v1.5.1, fix Sarvam TTS audio, and tune interruption pipeline#18

elt7613 wants to merge 2 commits intomainblackdwarftech/siphon:mainfrom

feat/sdk-upgrade-sarvam-tts-fix-adaptive-interruptionblackdwarftech/siphon:feat/sdk-upgrade-sarvam-tts-fix-adaptive-interruptionCopy head branch name to clipboard