Avatar provisioning via gateway; streaming TTS with word timestamps

What's Changed

• fix(core): reset user away timer on final STT transcript AGT-3149 by @chenghao-mou in https://github.com/livekit/agents/pull/6478
• Fix stripping of Gemma reasoning markers in streamed output by @C0deRatoR in https://github.com/livekit/agents/pull/6398
• feat: Spatius avatar plugin by @3DRX in https://github.com/livekit/agents/pull/5821
• fix(avatar): skip removal if avatar not found in the room by @longcw in https://github.com/livekit/agents/pull/6486
• fix(endpointing): keep max_delay constant in dynamic endpointing by @chenghao-mou in https://github.com/livekit/agents/pull/6265
• fix(stt): don't clear the primary speaker on an unattributed segment by @chuenchen309 in https://github.com/livekit/agents/pull/6460
• fix(drive-thru): assume quantity of one when unstated to avoid count confirmation by @u9g in https://github.com/livekit/agents/pull/6463
• fix: make AMD settle on endpointing backstop by default by @chenghao-mou in https://github.com/livekit/agents/pull/6496
• fix(voice): include function name in FunctionCallOutput protos by @u9g in https://github.com/livekit/agents/pull/6491
• feat: tag simulation and redaction telemetry by @chenghao-mou in https://github.com/livekit/agents/pull/6497
• Update READMEs to use gemma by @keepingitneil in https://github.com/livekit/agents/pull/6502
• fix(voice): don't drop the realtime turn when the chat-ctx push times out by @ByteMaster-1 in https://github.com/livekit/agents/pull/6445
• feat(voice): expose realtime provider request IDs by @yaodong-shen in https://github.com/livekit/agents/pull/6501
• Add 'zh-HK' to DeepgramLanguages by @devb-enp in https://github.com/livekit/agents/pull/6507
• (gnani): Update authors in pyproject.toml by @tinalenguyen in https://github.com/livekit/agents/pull/6489
• Allow local VAD inference to use a dedicated executor by @basnijholt in https://github.com/livekit/agents/pull/6498
• feat(fishaudio): add normalize_loudness and generation-tuning TTS options by @adrian-cowham in https://github.com/livekit/agents/pull/6520
• fix(voice): don't hold session.run() open on update_agent handoffs with long-lived on_enter by @k-zaher in https://github.com/livekit/agents/pull/6500
• plugins(krisp): add voice isolation telephony mode by @lukasIO in https://github.com/livekit/agents/pull/6510
• Support adaptive interruption for realtime models by @longcw in https://github.com/livekit/agents/pull/6488
• feat(inference): add inference.AvatarSession (avatar provisioning via the gateway) by @shawnfeldman in https://github.com/livekit/agents/pull/6492
• (inference): add fish audio tts by @tinalenguyen in https://github.com/livekit/agents/pull/6529
• slng: rewrite plugin around the Unmute Bridge (v2) by @metehan-slng in https://github.com/livekit/agents/pull/6442
• feat(speechify): streaming TTS with word-level timestamps via official SDK by @luke-speechify in https://github.com/livekit/agents/pull/6327
• fix(openai): recover from stale pooled Responses WebSocket connections by @longcw in https://github.com/livekit/agents/pull/6523
• prewarm LLM to skip connection establishment by @davidzhao in https://github.com/livekit/agents/pull/6484
• fix(otel): skip otel upload error logs if it's disabled by the project setting AGT-3015 by @chenghao-mou in https://github.com/livekit/agents/pull/6167
• chore(spatius): bump spatius to 1.0.4 by @3DRX in https://github.com/livekit/agents/pull/6536
• fix(livekit-agents): require livekit-protocol>=1.1.21 for MetricsRecordingHeader.simulated by @u9g in https://github.com/livekit/agents/pull/6541
• (xai tts): add new voices by @tinalenguyen in https://github.com/livekit/agents/pull/6543
• fix(speechify): restore caller header, close owned httpx client by @luke-speechify in https://github.com/livekit/agents/pull/6542
• fix(plugins-aws): Polly TTS silent on aiobotocore >=3.8.0 (AioStreamingBody has no .content) by @Gooh456 in https://github.com/livekit/agents/pull/6540
• feat(telemetry): include agent_name as an OTLP resource attribute by @jmcclanahan in https://github.com/livekit/agents/pull/6539
• livekit-agents@1.6.7 by @github-actions[bot] in https://github.com/livekit/agents/pull/6532

New Contributors

• @C0deRatoR made their first contribution in https://github.com/livekit/agents/pull/6398
• @3DRX made their first contribution in https://github.com/livekit/agents/pull/5821
• @chuenchen309 made their first contribution in https://github.com/livekit/agents/pull/6460
• @yaodong-shen made their first contribution in https://github.com/livekit/agents/pull/6501
• @basnijholt made their first contribution in https://github.com/livekit/agents/pull/6498
• @k-zaher made their first contribution in https://github.com/livekit/agents/pull/6500
• @shawnfeldman made their first contribution in https://github.com/livekit/agents/pull/6492
• @luke-speechify made their first contribution in https://github.com/livekit/agents/pull/6327
• @Gooh456 made their first contribution in https://github.com/livekit/agents/pull/6540
• @jmcclanahan made their first contribution in https://github.com/livekit/agents/pull/6539

Full Changelog: https://github.com/livekit/agents/compare/livekit-agents@1.6.6...livekit-agents@1.6.7