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_individual_nodes.py

@@ -76,62 +76,7 @@ async def test_regulatory_run_swallows_exception_returns_none(regulatory_instanc
     assert out is None
 
 
-# ─── ControlNode ────────────────────────────────────────────────────────────
-
-
-@pytest.fixture
-def control_instance():
-    from kilostar.core.individual.control_node.control_node import ControlNode
-    cls = ControlNode.__ray_actor_class__
-    obj = cls.__new__(cls)
-    from kilostar.utils.logger import get_logger
-    obj.logger = get_logger("control_node")
-    obj.agent = None
-    obj._model_settings = {}
-    return obj
-
-
-def _make_workflow_step():
-    from kilostar.core.work.workflow.workflow import WorkflowStep
-
-    return WorkflowStep(
-        step=1,
-        name="do something",
-        action="execute the thing",
-        inputs=None,
-        outputs="result",
-    )
-
-
-@pytest.mark.asyncio
-async def test_control_working_returns_for_workflow_output(control_instance):
-    from kilostar.core.individual.control_node.template import (
-        ForWorkflow,
-        ForWorkflowInput,
-    )
-
-    step = _make_workflow_step()
-    expected = ForWorkflow(output="done")
-    agent_run_result = SimpleNamespace(output=expected)
-
-    control_instance.agent = MagicMock()
-    control_instance.agent.run = AsyncMock(return_value=agent_run_result)
-
-    out = await control_instance.working(ForWorkflowInput(workflow_step=step))
-    assert out is expected
-
-
-@pytest.mark.asyncio
-async def test_control_working_swallows_exception_returns_none(control_instance):
-    from kilostar.core.individual.control_node.template import ForWorkflowInput
-
-    step = _make_workflow_step()
-    control_instance.agent = MagicMock()
-    control_instance.agent.run = AsyncMock(side_effect=RuntimeError("boom"))
-
-    out = await control_instance.working(ForWorkflowInput(workflow_step=step))
-    assert out is None
-
+# ─── ControlNode 已废弃，相关 fixture 与测试已删除（保留目录壳子供未来改写） ──
 
 # ─── ConsciousnessNode ──────────────────────────────────────────────────────