Sprint 1 — Lorenz Mood Engine

Implements the chaotic mood drift system that gives EMIYA non-deterministic emotional state across sessions.

Changes

• mood module — LorenzAttractor with RK4 integration, MoodEngine async ticker with ring buffer, mood-to-prompt fragment mapping
• L0 / L1 prompts — <mood> XML block injection at prompt build time
• server — WebSocket broadcast of mood state at 10Hz for live UI visualization

Sprint 1 status

• [x] Lorenz attractor implementation
• [x] Mood engine ticker
• [x] Mood → prompt mapping
• [x] WebSocket broadcast
• [ ] Frontend MoodCanvas (next)
• [ ] ASCII mode toggle (next)
• [ ] Mood Tuner UI (next)

Refs: SPRINT_ROADMAP.md