feat(agent): add_hint 触发的规划轮显式播报「本轮由新增 hint 触发」

此前 add_hint 走裸 notify，触发的规划轮 triggers 为空，开场白说"无具体变动"，
hint 只折在 graph_overview 里让 planner 自己发现。仿照 set_goals/NotifyGoal，
让 add_hint 记一条 hint 触发事件并带上提示文本。

- TriggerEvent 增加 Hints 字段；renderTriggers 增加 hint 分支，播报「人新增了
  N 条战略提示：…」
- ToolSet 增加 notifyHint 回调 + SetNotifyHint；add_hint 整批写完统一唤醒一次
  （优先 notifyHint，未接则退回裸 notify），notify 从 addOneHint 上移到 handler
- 主 agent(server.go) 与跨任务编排(orchestration.go) 均接上 Task.NotifyHint

server/manager.go

@@ -1776,6 +1776,21 @@ func (t *Task) NotifyGoal(texts []string) {
 	t.Notify()
 }
 
+// NotifyHint records that one OR MORE hints were added in a single add_hint call —
+// by the human via the main agent, or by cross-task orchestration — then wakes the
+// planner, so the next round is told "人新增了 N 条战略提示：…" and looks at them
+// directly instead of having to spot the new hint folded into the graph overview.
+// One call → one trigger event (a batched add_hint counts as one, not one per hint).
+func (t *Task) NotifyHint(texts []string) {
+	if len(texts) == 0 {
+		return
+	}
+	t.trigMu.Lock()
+	t.pendingTriggers = append(t.pendingTriggers, agent.TriggerEvent{Kind: "hint", Hints: texts})
+	t.trigMu.Unlock()
+	t.Notify()
+}
+
 // NotifyGoalDeleted records that the human deleted a goal (via 总览的目标管理), then
 // wakes the planner so the next round spells out which goal was removed. The event
 // survives an early-returning terminal round (drain happens after the gate).

server/orchestration.go

@@ -166,7 +166,8 @@ func (s *Server) delegateToTask(ctx context.Context, in json.RawMessage, pick fu
 	if s.m.Assets() != nil {
 		tsx.SetAssetStore(s.m.Assets(), s.m.Assets().Companies())
 	}
-	tsx.SetNotify(t.Notify) // hint writes wake this task's planner (no-op for read tools)
+	tsx.SetNotify(t.Notify)         // 通用唤醒（无专用回调的写操作走它；读工具为 no-op）
+	tsx.SetNotifyHint(t.NotifyHint) // add_hint → 记一条「人新增了 N 条战略提示：…」触发并唤醒 planner
 	return pick(tsx).Call(ctx, inner, nil)
 }
 

server/server.go

@@ -3571,7 +3571,7 @@ func (s *Server) chat(w http.ResponseWriter, r *http.Request) {
 			taskDir := filepath.Join(s.m.dir, "tasks", t.ID)
 			agentMsg := composeAgentMessage(req.Message, req.Attachments, taskDir)
 			s.engine.BeginLLMCall(t.ID)
-			_, err := ma.Chat(ctx, maTaskID, mainSeg, s.m.Assets(), t.Store, t.Goal, agentMsg, emit, t.Notify, resume, t.NotifyGoal)
+			_, err := ma.Chat(ctx, maTaskID, mainSeg, s.m.Assets(), t.Store, t.Goal, agentMsg, emit, t.Notify, resume, t.NotifyGoal, t.NotifyHint)
 			s.engine.EndLLMCall(t.ID)
 			if err != nil && ctx.Err() == nil {
 				s.engine.emitActivity(t, db.Activity{Worker: "mainagent", Kind: "text", IsError: true, Summary: "（主 Agent 出错：" + err.Error() + "）", MainSeg: segPtr})