新增: 知识图谱Phase1业务层(父②) + update_task parent_id 校验(P1)

父② 业务层(②.3+②.4+②.5):
- IPC: create_task 扩展 queue/parent_id/content_json + create/remove/list_task_links + move_task_queue(一致性约束联动 status) + get_task_tree
- 父聚合(②.4): advance_task 后重算父 status(count_children_by_status,set_status_for_aggregation 专用路径绕 D-260616-04 status 收口,父任务=容器模型唯一非状态机写入)
- AI 工具(②.5): register_task_graph_tools 分组 6 工具 + create_task 扩展,基线测试 32→38
- state.task_links: TaskLinkRepo + lib.rs 注册 5 新 IPC

P1 修复(verify agent 发现,主控修):
- update_task 漏 parent_id 校验(可绕 1 级嵌套创建孙任务/悬空 parent_id/自环)
- 补 parent_id 特判(对标 create_task: 父存在 + 父自身无 parent_id + 自环拒)

df-storage 99 lib + df-ai 331 + 基线测试 38 全过。

src-tauri/src/state.rs

@@ -13,7 +13,7 @@ use df_ai::ai_tools::AiToolRegistry;
 use df_storage::crud::{
     AiConversationRepo, AiMessageRepo, AiProviderRepo, AiToolExecutionRepo, IdeaEvalRepo, IdeaRepo,
     KnowledgeEventsRepo, KnowledgeRepo, NodeExecutionRepo, ProjectRepo, ReleaseRepo,
-    SettingsRepo, TaskRepo, WorkflowRepo,
+    SettingsRepo, TaskLinkRepo, TaskRepo, WorkflowRepo,
 };
 use df_storage::db::Database;
 use df_workflow::eventbus::EventBus;
@@ -337,6 +337,8 @@ pub struct AppState {
     pub projects: ProjectRepo,
     /// 任务表 Repo
     pub tasks: TaskRepo,
+    /// 任务横向关联表 Repo(知识图谱 Phase 1 V29,AI 拓扑排序编排调度的基础)
+    pub task_links: TaskLinkRepo,
     /// 发布表 Repo（预留:ReleaseRepo 持久化已就位·IPC/逻辑未接入·SW-260618-21 b 保留）
     #[allow(dead_code)]
     pub releases: ReleaseRepo,
@@ -662,6 +664,7 @@ impl AppState {
             idea_evaluations: IdeaEvalRepo::new(&db),
             projects: ProjectRepo::new(&db),
             tasks: TaskRepo::new(&db),
+            task_links: TaskLinkRepo::new(&db),
             releases: ReleaseRepo::new(&db),
             workflows: WorkflowRepo::new(&db),
             node_executions: NodeExecutionRepo::new(&db),