Add an `LLMMarkerFrame(DataFrame)` for sideband LLM markers that need to be persisted to context but should not flow through the standard text path (TTS, transcript). The frame carries an `append_to_context_immediately` flag so the assistant aggregator can either commit the marker as a stand-alone message (○ / ◐) or merge it with the upcoming aggregation as a prefix on the response (✓). `UserTurnCompletionLLMServiceMixin` now emits `LLMMarkerFrame` instead of pushing the marker as `LLMTextFrame(skip_tts=True)`, which fixes the case where an incomplete-turn marker (○ / ◐) was aggregated by the assistant aggregator but never committed to the context because the assistant turn lifecycle didn't run to completion (no spoken response, no `LLMFullResponseEndFrame`-driven `push_aggregation`). The frame is intentionally generic so other components — STT services with built-in turn signals, end-of-turn classifiers, custom annotations — can use the same mechanism to inject sideband signals into the assistant context.
12 KiB
12 KiB