# EVS STT Worker

This worker subscribes to VAD events from MQTT, transcribes the referenced WAV files, and publishes text back to MQTT.

Flow:
- input topic: `evs/<device_id>/vad_segment`
- reads: `wav_path` from JSON payload
- output topic: `evs/<device_id>/transcript`
- error topic: `evs/<device_id>/stt_error`
- default retain:
  - transcript retained (`STT_TRANSCRIPT_RETAIN=true`)
  - error non-retained (`STT_ERROR_RETAIN=false`)

Default model:
- `STT_MODEL=small`
- `STT_DEVICE=cpu`
- `STT_COMPUTE_TYPE=int8`