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/beaver/interfaces/channels/memory.py

@@ -55,3 +55,37 @@ class MemoryChannelAdapter:
         await self.bus.publish_inbound(message)
         return message
 
+    async def publish_external_text(
+        self,
+        content: str,
+        *,
+        chat_id: str,
+        message_id: str | None = None,
+        thread_id: str | None = None,
+        raw_payload: dict[str, Any] | None = None,
+        user_id: str | None = None,
+        title: str | None = None,
+    ) -> InboundMessage:
+        """Publish an old-style channel payload through the new adapter contract.
+
+        Real platform adapters should keep platform-specific fields here, build
+        a stable Beaver session_id, and pass the normalized InboundMessage to
+        the shared gateway bus.
+        """
+
+        session_parts = [self.name, chat_id]
+        if thread_id:
+            session_parts.append(thread_id)
+        metadata = {
+            "chat_id": chat_id,
+            "message_id": message_id,
+            "thread_id": thread_id,
+            "raw_channel_payload": raw_payload or {},
+        }
+        return await self.publish_text(
+            content,
+            session_id=":".join(str(part) for part in session_parts if str(part)),
+            user_id=user_id,
+            title=title,
+            metadata=metadata,
+        )