feat: 主 agent set_goals 加目标时给 planner 记「人新增了目标」触发(批量感知)

- 新增 TriggerEvent{Kind:"goal", Goals:[]string} + Task.NotifyGoal([]string):
  一次 set_goals(不论单条/数组)合并成一条触发,planner 下轮开头据 len 渲染
  「人新增了一个目标：X」或「人新增了 N 个目标：A;B;C」,不再靠翻 goals 列表发现。
- set_goals 工具:addOneGoal 退化为纯落库;唤醒/触发/复活挪到整批写完后统一做
  (notifyGoal(addedTexts) 一次 + resumeTask 一次)。仅 mainagent 接 notifyGoal;
  拆解器/worker 退回纯 notify,round-0 不受影响。
- 复活场景顺序仍成立:goal 触发先入队(终态门在 drain 之前不会吞),resumeTask
  置 running 后那一轮才 drain 渲染。mainagent.Chat 加 notifyGoal 入参。

agent/mainagent.go

@@ -64,14 +64,15 @@ func mainAgentSystem(goal, dataDir, workDir string) string {
 // non-nil, receives each execution step (thinking / tool_use / tool_result /
 // text / result) so the main-agent session shows its work — exactly like the
 // worker/planner sessions — not just the final answer.
-func (m *MainAgent) Chat(ctx context.Context, taskID int64, as *db.AssetStore, ts *db.ExplorationStore, goal, message string, emit func(db.Activity), notify, resume func()) (string, error) {
+func (m *MainAgent) Chat(ctx context.Context, taskID int64, as *db.AssetStore, ts *db.ExplorationStore, goal, message string, emit func(db.Activity), notify, resume func(), notifyGoal func([]string)) (string, error) {
 	tsx := NewToolSet(ts, "human")
 	if as != nil {
 		tsx.SetAssetStore(as, as.Companies())
 	}
 	tsx.SetTaskID(taskID)
-	tsx.SetNotify(notify)      // add_hint wakes this task's planner (debounced)
-	tsx.SetResumeTask(resume)  // set_goals 新增目标 → 把已完成/暂停的任务拉回 running
+	tsx.SetNotify(notify)          // add_hint wakes this task's planner (debounced)
+	tsx.SetResumeTask(resume)      // set_goals 新增目标 → 把已完成/暂停的任务拉回 running
+	tsx.SetNotifyGoal(notifyGoal)  // set_goals 新增目标 → 给 planner 记一条「人新增了目标：…」触发
 	// 领域工具 + 基础默认工具集（Read/Write/Edit/MultiEdit/LS/Glob/Grep/Bash）
 	base := append(tsx.MainAgentTools(), actool.DefaultTools()...)
 	tools, def, cleanup := AugmentTools(ctx, "mainagent", base)