feat(engine): 添加MCP连接管理和工具集成功能

- 集成MCP连接管理器，支持MCP服务器连接
- 添加多种内置工具：ClarifyTool、CronTool、DelegateTool、ExecuteCodeTool、
  PatchFileTool、ProcessTool、SendMessageTool、SpawnTool、TerminalTool、
  TodoTool、WebFetchTool、WebSearchTool、WriteFileTool等
- 实现工具注册和装配功能
- 添加技能选择上下文参数
- 支持思考模式控制参数thinking_enabled

feat(coordinator): 重构任务执行计划器参数命名

- 将learning_candidate_enabled重命名为allow_candidate_generation
- 更新TeamGraphScheduler中的参数传递
- 修改LocalAgentRunner中的相关参数处理
- 更新README文档中的相应描述

refactor(context): 标准化工具调用参数格式

- 添加_json导入用于参数序列化
- 实现_provider_tool_calls方法标准化OpenAI兼容的工具调用载荷
- 修复工具调用中参数非字符串类型的序列化问题

refactor(session): 优化消息历史记录过滤逻辑

- 修改get_messages_as_conversation为基于运行状态过滤消息
- 排除未完成、失败或错误结束的运行记录
- 改进对话历史的可见性控制机制

fix(store): 修复FTS索引重建逻辑

- 添加异常处理防止FTS索引创建失败
- 实现_rebuild_fts_index方法重新构建全文搜索索引
- 优化索引触发器和表的维护流程

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

@@ -0,0 +1,132 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+from fastapi.testclient import TestClient
+
+from beaver.interfaces.web.app import create_app
+from beaver.services.agent_service import AgentService
+
+
+@dataclass(slots=True)
+class StubRunResult:
+    session_id: str
+    run_id: str = "run-1"
+    output_text: str = "ok"
+    finish_reason: str = "stop"
+    tool_iterations: int = 0
+    provider_name: str | None = "stub"
+    model: str | None = "stub-model"
+    usage: dict[str, Any] = field(default_factory=lambda: {"total_tokens": 3})
+    task_id: str | None = "task-1"
+    task_status: str | None = "awaiting_feedback"
+    validation_result: dict[str, Any] | None = field(default_factory=lambda: {"accepted": True})
+
+
+class StubAgentService(AgentService):
+    def __init__(self, *, fail: bool = False) -> None:
+        super().__init__()
+        self.fail = fail
+        self.calls: list[dict[str, Any]] = []
+
+    async def submit_direct(self, message: str, **kwargs: Any) -> StubRunResult:  # type: ignore[override]
+        self.calls.append({"message": message, **kwargs})
+        if self.fail:
+            raise RuntimeError("boom")
+        return StubRunResult(
+            session_id=kwargs.get("session_id") or "web:default",
+            output_text=f"echo:{message}",
+        )
+
+
+def test_websocket_ping_pong() -> None:
+    app = create_app(service=StubAgentService(), manage_service_lifecycle=False)
+
+    with TestClient(app) as client:
+        with client.websocket_connect("/ws/web:alpha") as websocket:
+            websocket.send_json({"type": "ping"})
+            assert websocket.receive_json() == {"type": "pong"}
+
+
+def test_websocket_message_returns_chat_metadata_and_session_updated() -> None:
+    service = StubAgentService()
+    app = create_app(service=service, manage_service_lifecycle=False)
+
+    with TestClient(app) as client:
+        with client.websocket_connect("/ws/web:alpha") as websocket:
+            websocket.send_json(
+                {
+                    "type": "message",
+                    "content": "hello",
+                    "metadata": {"source": "test"},
+                    "attachments": [{"file_id": "file-1", "name": "a.txt"}],
+                }
+            )
+            assert websocket.receive_json() == {"type": "status", "status": "thinking"}
+            message = websocket.receive_json()
+            session_updated = websocket.receive_json()
+
+    assert service.calls == [
+        {
+            "message": "hello",
+            "session_id": "web:alpha",
+            "source": "websocket",
+            "user_id": None,
+            "title": None,
+            "execution_context": None,
+            "model": None,
+            "provider_name": None,
+            "embedding_model": None,
+        }
+    ]
+    assert message["type"] == "message"
+    assert message["role"] == "assistant"
+    assert message["content"] == "echo:hello"
+    assert message["session_id"] == "web:alpha"
+    assert message["run_id"] == "run-1"
+    assert message["task_id"] == "task-1"
+    assert message["task_status"] == "awaiting_feedback"
+    assert message["validation_result"] == {"accepted": True}
+    assert message["validation_status"] == "passed"
+    assert message["metadata"]["input_metadata"] == {
+        "source": "test",
+        "attachments": [{"file_id": "file-1", "name": "a.txt"}],
+    }
+    assert session_updated == {
+        "type": "session_updated",
+        "session_id": "web:alpha",
+        "source": "websocket",
+    }
+
+
+def test_websocket_empty_content_returns_error_without_runtime_call() -> None:
+    service = StubAgentService()
+    app = create_app(service=service, manage_service_lifecycle=False)
+
+    with TestClient(app) as client:
+        with client.websocket_connect("/ws/web:alpha") as websocket:
+            websocket.send_json({"type": "message", "content": "   "})
+            assert websocket.receive_json() == {"type": "error", "error": "'content' is required"}
+
+    assert service.calls == []
+
+
+def test_websocket_runtime_error_returns_assistant_error_message() -> None:
+    service = StubAgentService(fail=True)
+    app = create_app(service=service, manage_service_lifecycle=False)
+
+    with TestClient(app) as client:
+        with client.websocket_connect("/ws/web:alpha") as websocket:
+            websocket.send_json({"type": "message", "content": "hello"})
+            assert websocket.receive_json() == {"type": "status", "status": "thinking"}
+            message = websocket.receive_json()
+            websocket.send_json({"type": "ping"})
+            pong = websocket.receive_json()
+
+    assert message["type"] == "message"
+    assert message["role"] == "assistant"
+    assert message["session_id"] == "web:alpha"
+    assert message["finish_reason"] == "error"
+    assert "boom" in message["content"]
+    assert pong == {"type": "pong"}