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/engine/session/manager.py

@@ -121,7 +121,37 @@ class SessionManager:
         3. 让 `ContextBuilder` 明确消费的是“上游裁剪后的可见片段”
         """
 
-        history = self.get_messages_as_conversation(session_id)
+        records = self.get_event_records(session_id)
+        completed_run_ids = {
+            record.run_id
+            for record in records
+            if record.run_id and record.event_type == "run_completed"
+        }
+        failed_run_ids = {
+            record.run_id
+            for record in records
+            if record.run_id
+            and record.event_type == "run_completed"
+            and (
+                record.finish_reason == "error"
+                or (record.event_payload or {}).get("finish_reason") == "error"
+            )
+        }
+        history = []
+        for record in records:
+            if not record.context_visible or record.role == "system":
+                continue
+            if record.role == "tool":
+                continue
+            if record.role == "assistant" and record.tool_calls:
+                continue
+            if record.run_id and record.run_id not in completed_run_ids:
+                continue
+            if record.run_id and record.run_id in failed_run_ids:
+                continue
+            if record.role == "assistant" and record.finish_reason == "error":
+                continue
+            history.append(record.to_conversation_message())
         sliced = history[-max_messages:]
         for index, message in enumerate(sliced):
             if message.get("role") == "user":