- new emotion package: rule-based sentiment (positive/negative lexicon)
drives mood transitions (开心/平静/难过) with 30min inactivity decay;
affection 0-100 grows with positive interaction, with 初识→熟悉→信赖→
羁绊 tiers
- pipeline records each user message and injects a mood line into the
system prompt so the persona's tone follows her mood
- mood changes broadcast over WS; frontend shows a mood badge with
affection tooltip; also handles the 'reminder' message type from the
reminder scheduler
- tests: sentiment scoring, mood shift, affection bounds, prompt line,
onChange callback
