pipecat/changelog/4072.added.md

• Added WakePhraseUserFrameFilter, a new aggregator-level filter that gates user interaction behind a wake phrase. Unlike the previous WakeCheckFilter (which only filtered transcriptions), this filter runs inside the aggregator before VAD processing, blocking transcriptions, VAD events, and interruptions until the wake phrase is spoken. Configure via the new user_frame_filters parameter on LLMUserAggregatorParams. Also added BaseUserFrameFilter base class for building custom filters.