Agent

POST /api/agent
Content-Type: application/json
Authorization: Bearer plain_pk_xxx (或 cookie session)

{
  "prompt": "为投资人讲清楚 Q3 增长的 8 页 deck",
  "kind": "deck",
  "current": null,
  "workspace": [],
  "history": [],
  "mode": "brief"
}

{"type":"phase","phase":"routing"}
{"type":"intent","intent":{"action":"generate","target":"deck"}}
{"type":"phase","phase":"generating"}
{"type":"reasoning","source":"slide","text":"第 1 页:封面"}
{"type":"reasoning","source":"slide","text":"第 2 页:hero question"}
{"type":"doc","kind":"deck","source":"---\nmarp:true\n...","doc":{...}}
{"type":"phase","phase":"done"}