Interface SessionServiceGrpc.AsyncService (0.1.0)

Session service provides APIs for interacting with CES agents.

Establishes a bidirectional streaming connection with the CES agent. The agent processes continuous multimodal inputs (e.g., text, audio) and generates real-time multimodal output streams. --- Client Request Stream --- The client streams requests in the following order:

1. Initialization: The first message must contain SessionConfig. For audio sessions, this should also include InputAudioConfig and OutputAudioConfig to define audio processing and synthesis parameters.
2. Interaction: Subsequent messages stream SessionInput containing real-time user input data.
3. Termination: The client should half-close the stream when there is no more user input. It should also half-close upon receiving EndSession or GoAway from the agent. --- Server Response Stream --- For each interaction turn, the agent streams messages in the following sequence:
4. Speech Recognition (First N messages): Contains RecognitionResult representing the concatenated user speech segments captured so far. This is only populated for audio sessions.
5. Response (Next M messages): Contains SessionOutput delivering the agent's response in various modalities (e.g., text, audio).
6. Turn Completion (Final message of the turn): Contains SessionOutput with turn_completed set to true. This signals the end of the current turn and includes DiagnosticInfo with execution details. --- Audio Best Practices ---
7. Streaming: Stream audio data CONTINUOUSLY, even during silence. Recommended chunk size: 40-120ms (balances latency vs. efficiency).
8. Playback & Interruption: Play audio responses upon receipt. Stop playback immediately if an InterruptionSignal is received (e.g., user barge-in or new agent response).

Initiates a single turn interaction with the CES agent within a session.