pipecat/changelog/4405.added.2.md

• Added LLMTurnCompletionUserTurnStopStrategy in pipecat.turns.user_stop. When installed, the strategy gates on_user_turn_stopped on a UserTurnCompletedFrame (a new fieldless system frame emitted by any component that can judge turn completeness — e.g. the UserTurnCompletionLLMServiceMixin on ✓). A finalization_timeout provides a safety net if no completion frame ever arrives.