Thread 与 Run API

curl -X POST https://agents.example.com/v1/threads \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"metadata":{"external_id":"ticket-42"}}'

GET  /v1/threads/{thread_id}/state?checkpoint_id=...
GET  /v1/threads/{thread_id}/history
POST /v1/threads/{thread_id}/fork

curl -X POST https://agents.example.com/v1/threads/$THREAD_ID/runs \
  -H "Authorization: Bearer $TOKEN" \
  -H "Idempotency-Key: ticket-42-resolution-v1" \
  -H "Content-Type: application/json" \
  -d '{
    "assistant_id": "ASSISTANT_ID",
    "input": {"request":"reset access","result":""},
    "durability": "sync",
    "multitask_strategy": "enqueue",
    "run_timeout": 120,
    "max_model_calls": 8,
    "max_tool_calls": 4,
    "max_tokens": 12000,
    "max_cost": 1.5,
    "metadata": {"requester":"portal"}
  }'

GET /v1/runs/{run_id}
GET /v1/threads/{thread_id}/runs
GET /v1/runs/{run_id}/join?timeout=30

POST /v1/runs/{run_id}/cancel
POST /v1/runs/{run_id}/resume    {"resume": ..., "update": {...}, "goto": "..."}
POST /v1/runs/{run_id}/redrive