feat(agent): 预设本机工具、stdio MCP 传输与多轮上下文

- 预设 12 个本机工具并默认启用，装好即是可操作电脑的 Agent、无需总控配置或安装：
  文件与文件夹的查看/读取/写入/建目录/移动/删除（默认不覆盖、删目录需 recursive、
  拒绝删除系统目录与用户根目录）、用默认程序打开网址或文件、时间与时区换算
  （tzdata 已随包内置）、查看进程、屏幕截图、读写剪贴板。
- 工具下发改为通用：任意 HTTP MCP 服务与 stdio 本机命令（Agent 拉起子进程，
  容忍 stdout 噪声，命令缺失或进程崩溃会明确回报），支持多工具并存、
  定义未变更时复用连接、替换/删除/退出时回收子进程。
- 多轮上下文：task_dispatch.history 作为此前的 user/assistant 文本拼接到本次请求前，
  OpenAI 兼容、Anthropic、Gemini 分别适配；Agent 侧独立校验与限幅。
- 工具级实时进度以 progress 事件回传；使用预设工具的任务标记为 builtin 执行来源。
- Skill 与历史内容上限与总控对齐，多个已批准 Skill 不再被静默截断。
- 修复 build.ps1 缺 UTF-8 BOM 导致 build.bat 在 PowerShell 5.1 下语法报错。

mulit_agent/tests/test_task_executor.py

@@ -216,6 +216,80 @@ def test_executor_does_not_fall_back_to_llm_when_desktop_tool_is_not_applied(tmp
     assert "未部署或尚未应用" in str(events[-1]["error"])
 
 
+def test_executor_streams_tool_progress_while_the_task_runs(tmp_path):
+    database = AgentDatabase(tmp_path / "agent.sqlite3")
+
+    def runner(_instruction, _attachments, toolbox):
+        return f"结果：{toolbox.call('computer_time', {'timezone': 'UTC'})}"
+
+    executor = TaskExecutor(database, runner)
+    completed = Event()
+    events: list[dict[str, object]] = []
+
+    def capture(event: object) -> None:
+        assert isinstance(event, dict)
+        events.append(event)
+        if event.get("status") == "completed":
+            completed.set()
+
+    executor.task_event.connect(capture)
+    executor.submit("progress-task", "看看现在几点")
+
+    assert completed.wait(10)
+    progress = [str(event["message"]) for event in events if event.get("status") == "progress"]
+    assert any(message.startswith("调用 computer_time") for message in progress), progress
+    assert any(message.startswith("computer_time 返回：") for message in progress), progress
+    # Progress must arrive before the terminal event so the UI can stream it live.
+    statuses = [event.get("status") for event in events]
+    assert statuses.index("progress") < statuses.index("completed")
+
+
+def test_executor_ignores_progress_after_the_task_ended(tmp_path):
+    database = AgentDatabase(tmp_path / "agent.sqlite3")
+    executor = TaskExecutor(database, lambda instruction: "完成")
+    completed = Event()
+    events: list[dict[str, object]] = []
+
+    def capture(event: object) -> None:
+        assert isinstance(event, dict)
+        events.append(event)
+        if event.get("status") == "completed":
+            completed.set()
+
+    executor.task_event.connect(capture)
+    executor.submit("finished-task", "总结")
+    assert completed.wait(5)
+    reported = len(events)
+
+    executor._report_progress("finished-task")("迟到的进展")
+
+    assert len(events) == reported, "结束后的任务不应再产生中间步骤"
+
+
+def test_executor_passes_the_conversation_history_to_the_provider(tmp_path):
+    database = AgentDatabase(tmp_path / "agent.sqlite3")
+    received: list[tuple[tuple[str, str], ...]] = []
+
+    def runner(_instruction, _attachments, _toolbox, history):
+        received.append(history)
+        return "已复制到 D:\\target"
+
+    executor = TaskExecutor(database, runner)
+    completed = Event()
+    executor.task_event.connect(
+        lambda event: completed.set() if isinstance(event, dict) and event.get("status") == "completed" else None
+    )
+
+    executor.submit(
+        "follow-up-task",
+        "把它复制到 D:\\target",
+        history=(("user", "下载到 D:\\demo"), ("assistant", "已下载到 D:\\demo\\a.zip")),
+    )
+
+    assert completed.wait(5)
+    assert received == [(("user", "下载到 D:\\demo"), ("assistant", "已下载到 D:\\demo\\a.zip"))]
+
+
 def test_image_task_never_falls_back_to_text_only_model(tmp_path):
     database = AgentDatabase(tmp_path / "agent.sqlite3")
     calls: list[str] = []