feat: planner/worker 态势移出 system 入首轮 user + bench 提示词/调度器优化 + plan 心跳前端对齐 10min

- agent: planner/worker 把易变运行期数据(意图/态势/收尾词)从 system 移到本轮 user 输入,
  system 每轮/每 session 稳定更利于缓存;移除 worker 的 cross-trace 工具引导段
- web: plan 心跳前端默认/下限对齐后端 10min(600s),清理 300 旧注释
- bench: challenge_review 经验抽取结构化(区分 confirmed/inferred/negative、限制"已穷尽"、
  结构化 hint 格式);worker.md 补深度挖掘/目录扫描引导;scheduler 加 FAST_POLL 快轮询
- deps: norma v0.2.8 → v0.2.9

web/src/lib/api.ts

@@ -116,7 +116,7 @@ export const api = {
       llm_profile_id: llmProfileId ?? null,
       timeout_seconds: timeoutSeconds ?? 0,
       seed_first_intent: seedFirstIntent ?? true,
-      plan_heartbeat_seconds: planHeartbeatSeconds ?? 0, // 0 = 后端归一到默认 300(5min)
+      plan_heartbeat_seconds: planHeartbeatSeconds ?? 0, // 0 = 后端归一到默认 600(10min)
     }),
   deleteTask: (id: string) => del<{ deleted: number }>(`/tasks/${id}`),
   controlTask: (id: string, action: "pause" | "resume") => post<{ id: string; paused: boolean }>(`/tasks/${id}/control`, { action }),