Add CHANGELOG entry describing fix for the missing "bot-llm-text" RTVI event when using realtime (speech-to-speech) services

Author: kompfner

changelog/3446.fixed.md

@@ -0,0 +1,8 @@
+- Fixed an issue where the "bot-llm-text" RTVI event would not fire for realtime (speech-to-speech) services:
+
+  - `AWSNovaSonicLLMService`
+  - `GeminiLiveLLMService`
+  - `OpenAIRealtimeLLMService`
+  - `GrokRealtimeLLMService`
+
+  The issue was that these services weren't pushing `LLMTextFrame`s. Now they do.