Add parentRunId to resume runs for AG-UI protocol conformance

[Copilot]

AG-UI protocol requires RUN_STARTED events from resume runs to carry parentRunId referencing the interrupted run, creating a lineage chain. This was missing.

Changes

• AGUIEventEmitter: Accept parent_run_id, propagate to RunStartedEvent
• agent.run_agui(): Accept optional parent_run_id parameter
• agent._pending_interrupt: Store run_id at interrupt time for hot-path resume lookup
• agent_service.resume_agui(): Extract interrupted run ID from memory (hot) or DB round (cold), pass as parent_run_id
• _load_persisted_interrupt(): Return round_id for cold recovery path
• 4 new protocol conformance tests

After resume, the event stream now correctly emits:

{
  "type": "RUN_STARTED",
  "threadId": "thread_001",
  "runId": "run_002",
  "parentRunId": "run_001"
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• openaipublic.blob.core.windows.net
  • Triggering command: /usr/bin/python python -m pytest tests/test_ask_user_tool.py -v (dns block)
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  • Triggering command: /usr/bin/python python -m pytest tests/test_ask_user_tool.py tests/test_agent.py -v (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[RonaldJEN]

@copilot 用中文summary下本次修改

[Copilot]

@copilot 用中文summary下本次修改

本次修改的核心目标是让 ask_user 的中断/恢复流程符合 AG-UI 协议规范中关于 parentRunId 的要求。

问题：AG-UI 协议要求 resume 运行的 RUN_STARTED 事件必须携带 parentRunId，指向被中断的运行 ID，形成类似 git 的血缘链。当前实现缺失了这个关联。

改动点：

1. AGUIEventEmitter：构造函数新增 parent_run_id 参数，传递到 RunStartedEvent
2. agent.run_agui()：新增可选参数 parent_run_id，透传给 emitter
3. agent._pending_interrupt：中断时保存当前 run_id，供恢复时查找父运行 ID
4. agent_service.resume_agui()：从内存（热路径）或数据库 round（冷路径）提取被中断运行的 ID，作为 parent_run_id 传入
5. agent_service._load_persisted_interrupt()：冷恢复路径下返回 round_id
6. 新增 4 个协议一致性测试，验证 parentRunId 在各场景下的正确性

效果：resume 后事件流正确输出：

{
  "type": "RUN_STARTED",
  "runId": "run_002",
  "parentRunId": "run_001"
}