added changelog entry for user mute strategies

changelog/3292.added.md

@@ -0,0 +1,29 @@
+- Introducing user mute strategies. User mute strategies indicate when user input should be muted based on the current system state.
+
+  In conversational agents, user mute strategies are used to prevent user input from interrupting bot speech, tool execution, or other critical system operations.
+
+  A list of strategies can be specified; all strategies are evaluated for every frame so that each strategy can maintain its internal state. A user frame is muted if any of the configured strategies indicates it should be muted.
+
+  Available user mute strategies:
+
+  * `FirstSpeechUserMuteStrategy`
+  * `MuteUntilFirstBotCompleteUserMuteStrategy`
+  * `AlwaysUserMuteStrategy`
+  * `FunctionCallUserMuteStrategy`
+
+  User mute strategies replace the legacy `STTMuteFilter` and provide a more flexible and composable approach to muting user input.
+
+  User mute strategies are configured when setting up the `LLMContextAggregatorPair`. For example:
+
+  ```python
+  context_aggregator = LLMContextAggregatorPair(
+      context,
+      user_params=LLMUserAggregatorParams(
+          user_mute_strategies=[
+              FirstSpeechUserMuteStrategy(),
+          ]
+      ),
+  )
+  ```
+
+  In order to use user mute strategies you should update to the new universal `LLMContext` and `LLMContextAggregatorPair`.