riotpiao.com/tasks/5.12-chat-sse-events.md

5.12 — Chat SSE event types (GREEN)

Phase: 5 — Chat + Rate Limiter (Surface D) Stage: GREEN

Depends on: 5.7

• Chat SSE events: {"type":"reasoning"|"content"|"queue"|"done"|"error"} — render reasoning_content in collapsible block (this is the demo)