FishAudio TTS hang fixed; Google STT memory leak closed; pipeline deadlock prevented

What's Changed

• fix(fishaudio): prevent TTS generation hang by @davidzhao in https://github.com/livekit/agents/pull/5649
• add comments to agent side and inference side fallback adapters by @tmshapland in https://github.com/livekit/agents/pull/5654
• fix(amd): fix negative zero in amd delay calculation by @chenghao-mou in https://github.com/livekit/agents/pull/5650
• fix(async-toolset): use underscore in synthetic call_id by @longcw in https://github.com/livekit/agents/pull/5656
• fix(console): set mock participant state to active by @longcw in https://github.com/livekit/agents/pull/5645
• Update LemonSlice integration to use wait_playback_start by @jp-lemon in https://github.com/livekit/agents/pull/5655
• Fix the memory leak of Google STT when no audio input. by @jmuk in https://github.com/livekit/agents/pull/5591
• ci(examples): add separate file for workflow by @tinalenguyen in https://github.com/livekit/agents/pull/5651
• fix: wording in missing required argument error by @carschandler in https://github.com/livekit/agents/pull/5659
• chore(amd): add uncertain branch in example by @chenghao-mou in https://github.com/livekit/agents/pull/5658
• docs(agents): document realtime capabilities by @shizhigu in https://github.com/livekit/agents/pull/5598
• fix(elevenlabs): restore chunk_length_schedule in WS init payload by @IanSteno in https://github.com/livekit/agents/pull/5006
• fix(voice): prevent scheduling deadlock when pipeline task crashes by @theomonnom in https://github.com/livekit/agents/pull/5678
• (elevenlabs tts): add apply_language_text_normalization param by @tinalenguyen in https://github.com/livekit/agents/pull/5679
• (gemini llm): add service tier param by @tinalenguyen in https://github.com/livekit/agents/pull/5680
• Emit AgentConfigUpdate in OTLP session logs by @theomonnom in https://github.com/livekit/agents/pull/5601
• fix(core): clean up variables when committing a user turn manually by @chenghao-mou in https://github.com/livekit/agents/pull/5671
• (deepgram stt): add redact param by @tinalenguyen in https://github.com/livekit/agents/pull/5692
• fix(agents): persist _speech_start_time across intra-turn VAD bursts by @AlessandroElyos in https://github.com/livekit/agents/pull/5585
• fix: pass API key via header in Neuphonic and Murf WebSocket TTS by @u9g in https://github.com/livekit/agents/pull/5691
• fix(core): make default user span time explicit by @chenghao-mou in https://github.com/livekit/agents/pull/5699
• require CanManageAgentSession grant for remote session by @theomonnom in https://github.com/livekit/agents/pull/5487
• test(examples/survey): add TaskGroup testing reference (DOCS-1225) by @kath0la in https://github.com/livekit/agents/pull/5557
• fix(anthropic): raise default httpx read timeout for streaming; add configurable timeout param by @SuperMarioYL in https://github.com/livekit/agents/pull/5529
• fix(examples): consistent CSV schema in survey_agent by @u9g in https://github.com/livekit/agents/pull/5689
• Adding fine-grained VAD params to Sarvam saaras:v3 STT plugin by @dhruvladia-sarvam in https://github.com/livekit/agents/pull/5563
• Update codec config, MIME mapping, and interruption handling by @dhruvladia-sarvam in https://github.com/livekit/agents/pull/5561
• (gradium): update endpoint by @tinalenguyen in https://github.com/livekit/agents/pull/5722
• Revert "require CanManageAgentSession grant for remote session (#5487)" by @chenghao-mou in https://github.com/livekit/agents/pull/5714
• feat(gemini llm): add media resolution option to LLM and RealtimeModel by @csanz91 in https://github.com/livekit/agents/pull/5712
• (inworld tts): add language param by @tinalenguyen in https://github.com/livekit/agents/pull/5723
• fix(core): surface real http_context error from STT streams by @longcw in https://github.com/livekit/agents/pull/5709
• docs: clarify function tools executed event pairing by @nightcityblade in https://github.com/livekit/agents/pull/5701
• feat(workflows): expose dtmf and ringing_timeout on WarmTransferTask by @a-gasior in https://github.com/livekit/agents/pull/5721
• fix(agents): await realtime auto tool reply in RunResult by @longcw in https://github.com/livekit/agents/pull/5702
• chore(amd): update default models and default behavior by @chenghao-mou in https://github.com/livekit/agents/pull/5713
• Add Perplexity LLM plugin by @jliounis in https://github.com/livekit/agents/pull/5610
• fix: raise on unexpected ElevenLabs websocket close by @nightcityblade in https://github.com/livekit/agents/pull/5729
• fix(agents): clear pending auto tool reply future on timeout by @u9g in https://github.com/livekit/agents/pull/5725
• (azure + perplexity): bump versions by @tinalenguyen in https://github.com/livekit/agents/pull/5731
• fix: do not republish tracks on reconnect by @davidzhao in https://github.com/livekit/agents/pull/5698
• chore(amd): add default amd prediction log by @chenghao-mou in https://github.com/livekit/agents/pull/5732
• feat(rime): add WebSocket streaming TTS support by @mcullan in https://github.com/livekit/agents/pull/5663
• livekit-agents@1.5.9 by @github-actions[bot] in https://github.com/livekit/agents/pull/5733

New Contributors

• @jmuk made their first contribution in https://github.com/livekit/agents/pull/5591
• @shizhigu made their first contribution in https://github.com/livekit/agents/pull/5598
• @SuperMarioYL made their first contribution in https://github.com/livekit/agents/pull/5529
• @nightcityblade made their first contribution in https://github.com/livekit/agents/pull/5701
• @a-gasior made their first contribution in https://github.com/livekit/agents/pull/5721
• @jliounis made their first contribution in https://github.com/livekit/agents/pull/5610

Full Changelog: https://github.com/livekit/agents/compare/livekit-agents@1.5.8...livekit-agents@1.5.9