updated changelog

Author: digitallysavvy

changelog.md

@@ -4,6 +4,25 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
+## [v1.4.0] — 2026-05-13
+
+### Added
+
+- **`DeepgramTTS`** — New TTS vendor wrapper for Deepgram (Beta). Accepts `api_key`, `model`, `base_url`, `sample_rate`, `params`, and `skip_patterns`.
+- **`Agent.with_tools(enabled=True)`** — Dedicated builder method to enable MCP tool invocation (`advanced_features.enable_tools`). Replaces the raw `with_advanced_features(AdvancedFeatures(enable_tools=True))` call.
+- **LLM vendors: `headers` field** — All four LLM vendors (`OpenAI`, `AzureOpenAI`, `Anthropic`, `Gemini`) now accept an optional `headers: Dict[str, str]` parameter. Use this to pass custom HTTP headers to the LLM provider (e.g., tenant identifiers, routing headers).
+- **`AgentSession.think()` / `AsyncAgentSession.think()`** — Send a custom instruction to a running agent through the `agent_management` API.
+- **`Agent.with_interruption()`** — Configure the new top-level `interruption` object for unified interruption control.
+- **MLLM turn detection** — `OpenAIRealtime`, `GeminiLive`, and `VertexAI` now accept `turn_detection`, which maps to `mllm.turn_detection` and overrides top-level turn detection for MLLM sessions.
+- **MLLM vendor parity** — `GeminiLive` is documented and exposed as the direct Google Gemini Live API wrapper.
+
+### Fixed
+
+- **MiniMax TTS preset stripping** — When a MiniMax reseller preset is inferred (`minimax_speech_2_6_turbo` or `minimax_speech_2_8_turbo`), the `group_id` and `url` fields are now correctly stripped from `tts.params` alongside `key` and `model`. Previously they were forwarded to the API, causing request failures.
+- **MLLM enable flag** — `Agent.with_mllm()` now sets `mllm.enable = True` and removes the deprecated `advanced_features.enable_mllm` flag from generated requests.
+- **MLLM wrapper shape** — MLLM vendors no longer emit removed fields such as `style`; docs and tests now reflect the v2.6 MLLM contract.
+- **AgentKit parity coverage** — Added regression coverage for interruption, MLLM turn detection, Deepgram TTS, LLM headers, and deprecated MLLM flag cleanup.
+
 ## [v1.3.0] — 2026-04-02
 
 ### Added