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/store.py

@@ -128,19 +128,46 @@ class SessionStore:
             self._conn.executescript(SCHEMA_SQL)
             try:
                 self._conn.execute("SELECT * FROM messages_fts LIMIT 0")
-            except sqlite3.OperationalError:
-                self._conn.executescript(FTS_TABLE_SQL)
-            self._conn.executescript(FTS_TRIGGER_SQL)
+                self._conn.executescript(FTS_TRIGGER_SQL)
+            except sqlite3.Error:
+                self._rebuild_fts_index()
+                return
             # 旧版本可能把 hidden 事件也写进了 FTS；初始化时顺手清掉这些噪声项。
-            self._conn.execute(
-                """
-                INSERT INTO messages_fts(messages_fts, rowid, content)
-                SELECT 'delete', id, content
-                FROM messages
-                WHERE context_visible = 0 AND content IS NOT NULL
-                """
-            )
-            self._conn.commit()
+            try:
+                self._conn.execute(
+                    """
+                    INSERT INTO messages_fts(messages_fts, rowid, content)
+                    SELECT 'delete', id, content
+                    FROM messages
+                    WHERE context_visible = 0 AND content IS NOT NULL
+                    """
+                )
+                self._conn.commit()
+            except sqlite3.Error:
+                self._rebuild_fts_index()
+
+    def _rebuild_fts_index(self) -> None:
+        """Recreate the derived FTS index without touching canonical session rows."""
+
+        self._conn.executescript(
+            """
+            DROP TRIGGER IF EXISTS messages_fts_insert;
+            DROP TRIGGER IF EXISTS messages_fts_delete;
+            DROP TRIGGER IF EXISTS messages_fts_update;
+            DROP TABLE IF EXISTS messages_fts;
+            """
+        )
+        self._conn.executescript(FTS_TABLE_SQL)
+        self._conn.executescript(FTS_TRIGGER_SQL)
+        self._conn.execute(
+            """
+            INSERT INTO messages_fts(rowid, content)
+            SELECT id, content
+            FROM messages
+            WHERE context_visible = 1 AND content IS NOT NULL
+            """
+        )
+        self._conn.commit()
 
     def close(self) -> None:
         with self._lock: