feat: 清理 control_node + 引入 task 一等公民

- control_node 标注 DEPRECATED：保留目录壳子供未来远程探针节点复用，删除调用路径与相关测试
- 新增 task 表：极简元数据持久化 regulatory_node 完成的短任务（出报告/写文件/查询整理）
- regulatory_node 自标注：MessageResponse 扩展 task_action/title/summary，_run 末尾非阻塞落库
- query_task_list 改查 task 表，符合用户对"任务列表"的直觉，与 workflow 体系解耦
- 新增 /api/v1/task/list|/{id} 只读 API（task 由 regulatory 内部触发，不开放对外创建）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/unit/test_task_database.py

@@ -0,0 +1,97 @@
+"""``TaskDatabase`` 单元测试：覆盖 create / get / list / update_status 路径。"""
+
+from __future__ import annotations
+
+import pytest
+from unittest.mock import AsyncMock, MagicMock
+
+from kilostar.core.postgres_database.module.task import TaskDatabase
+
+
+def _make_db():
+    session = AsyncMock()
+    session.__aenter__ = AsyncMock(return_value=session)
+    session.__aexit__ = AsyncMock(return_value=False)
+    session_maker = MagicMock(return_value=session)
+    return TaskDatabase(session_maker), session
+
+
+@pytest.mark.anyio
+async def test_create_task_persists_row():
+    db, session = _make_db()
+    session.add = MagicMock()
+    session.commit = AsyncMock()
+
+    await db.create_task(
+        task_id="t1",
+        user_id="alice",
+        command="写一份周报",
+        title="Q2 周报",
+        chat_id="chat-1",
+        status="completed",
+        result_summary="已生成报告",
+    )
+    session.add.assert_called_once()
+    added = session.add.call_args[0][0]
+    assert added.task_id == "t1"
+    assert added.user_id == "alice"
+    assert added.title == "Q2 周报"
+    assert added.status == "completed"
+    session.commit.assert_awaited_once()
+
+
+@pytest.mark.anyio
+async def test_get_task_returns_none_when_missing():
+    db, session = _make_db()
+    execute_result = MagicMock()
+    execute_result.scalar_one_or_none.return_value = None
+    session.execute = AsyncMock(return_value=execute_result)
+
+    result = await db.get_task("missing")
+    assert result is None
+
+
+@pytest.mark.anyio
+async def test_list_tasks_by_user_filters_status():
+    """传 status 时 SQL 应进入 status 过滤分支（execute 被调用一次即视为路径已走通）。"""
+    db, session = _make_db()
+    execute_result = MagicMock()
+    execute_result.scalars.return_value.all.return_value = []
+    session.execute = AsyncMock(return_value=execute_result)
+
+    result = await db.list_tasks_by_user(user_id="alice", status="completed", limit=10)
+    assert result == []
+    session.execute.assert_awaited_once()
+
+
+@pytest.mark.anyio
+async def test_list_tasks_by_user_no_status():
+    db, session = _make_db()
+    execute_result = MagicMock()
+    execute_result.scalars.return_value.all.return_value = []
+    session.execute = AsyncMock(return_value=execute_result)
+
+    await db.list_tasks_by_user(user_id="alice")
+    session.execute.assert_awaited_once()
+
+
+@pytest.mark.anyio
+async def test_update_status_with_summary():
+    db, session = _make_db()
+    session.execute = AsyncMock()
+    session.commit = AsyncMock()
+
+    await db.update_status("t1", status="failed", result_summary="出错")
+    session.execute.assert_awaited_once()
+    session.commit.assert_awaited_once()
+
+
+@pytest.mark.anyio
+async def test_update_status_without_summary():
+    db, session = _make_db()
+    session.execute = AsyncMock()
+    session.commit = AsyncMock()
+
+    await db.update_status("t1", status="running")
+    session.execute.assert_awaited_once()
+    session.commit.assert_awaited_once()