v2.1.0

Added

• Turn detection language — AgentKit now manages Agora interaction language through TurnDetectionConfig.Language, validates it against the supported BCP-47 language list, and sends the default en-US when no language is provided.
• Provider parameter parity — ASR, LLM, MLLM, TTS, and avatar wrappers expose typed provider parameters plus passthrough fields where the generated core supports additional properties.

Changed

• Generated core refresh — Regenerated core types from the v2.1 API schema.
• Deepgram TTS passthrough — NewDeepgramTTS now uses AdditionalParams for passthrough fields and flattens them into tts.params; the removed nested params.params shape is no longer documented or emitted.
• OpenAI TTS — Docs and tests now reflect the generated core shape, including Instructions and Speed under tts.params.
• TTS provider docs — Updated TTS provider reference tables to match implemented wrapper fields and generated core params.

Fixed

• Managed-provider validation — AgentKit validation now distinguishes preset-backed providers from BYOK providers so required provider fields are only required when credentials are caller-supplied.
• Language placement — Provider-specific STT language values remain under asr.params, while Agora interaction language is emitted separately as turn_detection.language.
• Deepgram TTS explicit fields — AdditionalParams can no longer override explicit APIKey, Model, BaseURL, or SampleRate values.