flowchart LR
    subgraph OnDevice["On-device"]
        ESP32[ESP32-S3<br/>wake word · mic · LED]
    end

    subgraph Lab["Home lab (.13 · .30 · .35)"]
        MQTT[(MQTT<br/>mosquitto :1883)]
        WHISPER[Whisper STT<br/>faster-whisper]
        AGENT[Jervis Agent<br/>FastAPI :8501]
        HA[Home Assistant<br/>.30 :8123]
        OMNI[OmniRoute<br/>LLM gateway :20129]
        MOPIDY[Mopidy · Spotify<br/>music :6600]
        APPRISE[Apprise<br/>notifications .35]
        SNAP[Snapcast<br/>multi-room :1780]
        PIPER[Piper TTS<br/>:10200]
        SPEAKERS[House Speakers<br/>whole home]
    end

    ESP32 -->|audio stream| MQTT
    MQTT -.->|speech frames| WHISPER
    WHISPER -->|transcript| AGENT
    AGENT -->|control · todo · timers| HA
    AGENT -->|intent / Q&A| OMNI
    AGENT -.->|play · pause · volume| MOPIDY
    AGENT -.->|family messages| APPRISE
    AGENT -->|reply text| SNAP
    SNAP -.->|synthesize speech| PIPER
    PIPER -->|speech wav| SNAP
    SNAP -->|audio out| SPEAKERS