docs: update README recent highlights and group image (#59)

docs: update README recent highlights and group image

README.md

@@ -55,6 +55,7 @@ After a few weeks, your agent instance will have a skill tree no one else in the
 
 ## 📅 Latest News
 
+- **2026-04-11:** Introduced **L4 session archive memory** and scheduler cron integration
 - **2026-03-23:** Support personal WeChat as a bot frontend
 - **2026-03-10:** [Released million-scale Skill Library](https://mp.weixin.qq.com/s/q2gQ7YvWoiAcwxzaiwpuiQ?scene=1&click_id=7)
 - **2026-03-08:** [Released "Dintal Claw" — a GenericAgent-powered government affairs bot](https://mp.weixin.qq.com/s/eiEhwo-j6S-WpLxgBnNxBg)
@@ -131,8 +132,10 @@ GenericAgent accomplishes complex tasks through **Layered Memory × Minimal Tool
 > _Memory crystallizes throughout task execution, letting the agent build stable, efficient working patterns over time._
 
 - **L0 — Meta Rules**: Core behavioral rules and system constraints of the agent
+- **L1 — Insight Index**: Minimal memory index for fast routing and recall
 - **L2 — Global Facts**: Stable knowledge accumulated over long-term operation
-- **L3 — Task Skillss**: Workflows for completing specific task types
+- **L3 — Task Skills / SOPs**: Reusable workflows for completing specific task types
+- **L4 — Session Archive**: Archived task records distilled from finished sessions for long-horizon recall
 
 2️⃣ **Autonomous Execution Loop**
 
@@ -233,6 +236,7 @@ MIT License — see [LICENSE](LICENSE)
 
 ## 📅 最新动态
 
+- **2026-04-11:** 引入 **L4 会话归档记忆**，并接入 scheduler cron 调度
 - **2026-03-23:** 支持个人微信接入作为 Bot 前端
 - **2026-03-10:** [发布百万级 Skill 库](https://mp.weixin.qq.com/s/q2gQ7YvWoiAcwxzaiwpuiQ?scene=1&click_id=7)
 - **2026-03-08:** [发布以 GenericAgent 为核心的"政务龙虾" Dintal Claw](https://mp.weixin.qq.com/s/eiEhwo-j6S-WpLxgBnNxBg)
@@ -378,8 +382,10 @@ GenericAgent 通过**分层记忆 × 最小工具集 × 自主执行循环**完
 
 
 - **L0 — 元规则（Meta Rules）**：Agent 的基础行为规则和系统约束
+- **L1 — 记忆索引（Insight Index）**：极简索引层，用于快速路由与召回
 - **L2 — 全局事实（Global Facts）**：在长期运行过程中积累的稳定知识
-- **L3 — 任务 Skills（Standard Operating Procedure）**：完成特定任务的操作流程
+- **L3 — 任务 Skills / SOPs**：完成特定任务类型的可复用流程
+- **L4 — 会话归档（Session Archive）**：从已完成任务中提炼出的归档记录，用于长程召回
 
 2️⃣ **自主执行循环**