Variable ATTRIBUTE_TRANSCRIPTION_EXPRESSIONConst

ATTRIBUTE_TRANSCRIPTION_EXPRESSION: "lk.expression" = 'lk.expression'

The expression (delivery/emotion) the agent used for a transcription segment, surfaced so the frontend can react to it, when expressive markup is stripped from the transcript. The value is a JSON object {"expression": ..., "mood": ...} carrying the segment's leading expression — the <expression> tag for Inworld/xAI or the <emotion> tag for Cartesia — plus the mood it normalizes to, e.g. {"expression":"speak happy","mood":"happy"}. A JSON object (rather than a bare string) so the shape can gain fields later without breaking parsers.