feat(coordinator): 添加团队节点默认最大工具迭代次数配置

添加 DEFAULT_TEAM_NODE_MAX_TOOL_ITERATIONS 配置项以控制团队节点的最大工具迭代次数，
并修改 LocalAgentRunner 中的逻辑来使用此默认值当 envelope 中未指定时。

fix(runtime): 修复团队节点运行成功判断逻辑

更新运行成功判断条件，将 finish_reason 为 "max_tool_iterations_finalized" 的情况
视为运行失败，并添加对原始工具调用输出的检测，避免将其误判为成功完成。

feat(mcp): 添加团队工作流MCP工具类别支持

增加新的本地MCP工具类别 "team_workflow" 及其对应的工具创建功能，
为团队工作流提供本地工具支持。

refactor(engine): 调整AgentLoop最大工具迭代次数设置

将 AgentProfile 中的默认 max_tool_iterations 从 30 增加到 100，
同时移除 TaskExecutionPlanner 构造函数中的重复参数传递。

perf(mcp): 优化MCP连接管理避免重复连接

添加 mcp_connected 标志来跟踪MCP连接状态，确保 connect_all 只执行一次，
提高性能并避免不必要的重复连接。

refactor(skills): 移除技能团队模板相关功能

移除与技能团队模板相关的代码，包括解析、存储和处理逻辑，
简化技能记录结构和加载流程。

feat(process): 增强会话过程投影器功能

添加技能激活快照事件处理，改进团队运行完成消息显示，
并增强技能激活事件的时间戳记录功能。

refactor(tasks): 简化任务尝试编排器团队执行逻辑

移除团队执行相关代码，将所有任务统一按单步执行处理，
简化任务编排器的复杂度并提升执行效率。

fix(evidence): 修复节点证据评估中需求验证逻辑

更新节点证据评估逻辑，跳过自然语言证据需求的确定性验证，
只执行机器可读的需求验证，避免因自然语言需求导致的节点失败。

app-instance/backend/tests/unit/test_legacy_team_cleanup.py

@@ -0,0 +1,120 @@
+from __future__ import annotations
+
+import asyncio
+from types import SimpleNamespace
+from typing import Any
+
+from beaver.coordinator import AgentDescriptor, ExecutionGraph, ExecutionNode
+from beaver.engine import AgentRunResult
+from beaver.tasks import TaskExecutionPlan, TaskRecord
+from beaver.tasks.attempt_orchestrator import TaskAttemptOrchestrator
+
+
+class FakeTaskService:
+    def start_run(self, task_id: str, **_: Any) -> None:
+        return None
+
+    def append_run(self, task_id: str, run_id: str, **_: Any) -> TaskRecord:
+        return self.task
+
+
+class FakeSessionManager:
+    def __init__(self) -> None:
+        self.events: list[dict[str, Any]] = []
+
+    def append_message(self, session_id: str, **kwargs: Any) -> None:
+        self.events.append({"session_id": session_id, **kwargs})
+
+    def update_latest_assistant_event_payload(self, *args: Any, **kwargs: Any) -> None:
+        return None
+
+    def get_run_event_records(self, session_id: str, run_id: str) -> list[Any]:
+        return []
+
+
+class LegacyTeamPlanner:
+    async def plan(self, **_: Any) -> TaskExecutionPlan:
+        return TaskExecutionPlan(
+            mode="team",
+            reason="legacy plan should be ignored by orchestrator",
+            graph=ExecutionGraph(
+                strategy="sequence",
+                nodes=[
+                    ExecutionNode("collect", "Collect", AgentDescriptor(name="collect")),
+                ],
+            ),
+        )
+
+
+def _task() -> TaskRecord:
+    return TaskRecord(
+        task_id="task-1",
+        session_id="session-1",
+        description="finance comparison",
+        goal="finance comparison",
+        constraints=[],
+        priority=0,
+        status="open",
+        creator="test",
+        created_at="now",
+        updated_at="now",
+    )
+
+
+def test_builtin_tools_do_not_export_legacy_agent_team_tool() -> None:
+    import beaver.tools.builtins as builtins
+
+    assert "AgentTeamTool" not in builtins.__all__
+    assert not hasattr(builtins, "AgentTeamTool")
+
+
+def test_task_orchestrator_does_not_execute_legacy_planner_team_graph() -> None:
+    task = _task()
+    task_service = FakeTaskService()
+    task_service.task = task
+    session_manager = FakeSessionManager()
+    loaded = SimpleNamespace(
+        task_service=task_service,
+        task_execution_planner=LegacyTeamPlanner(),
+        session_manager=session_manager,
+        run_memory_store=None,
+    )
+    orchestrator = TaskAttemptOrchestrator(
+        loaded=loaded,
+        create_loop=lambda: None,
+        make_provider_bundle_for_task=lambda *_: None,
+    )
+
+    async def fail_if_called(*args: Any, **kwargs: Any) -> Any:
+        raise AssertionError("legacy planner team graph must not start TeamService")
+
+    async def runner(message: str, **kwargs: Any) -> AgentRunResult:
+        return AgentRunResult(
+            session_id="session-1",
+            run_id="main-run",
+            output_text="single path",
+            finish_reason="stop",
+            tool_iterations=0,
+        )
+
+    orchestrator._run_team_for_task = fail_if_called  # type: ignore[method-assign]
+    result = asyncio.run(
+        orchestrator.run(
+            message="compare finance",
+            runner=runner,
+            kwargs={
+                "session_id": "session-1",
+                "provider_bundle": SimpleNamespace(),
+                "include_skill_assembly": False,
+            },
+            task=task,
+        )
+    )
+
+    assert result.output_text == "single path"
+    synthesis_events = [
+        event
+        for event in session_manager.events
+        if event.get("event_type") == "task_synthesis_completed"
+    ]
+    assert synthesis_events[0]["event_payload"]["task_outcome"] == "single"