Add NapMem and Proactive Memory Agent papers

[RerankerGuo]

Summary

Closes #121

Add two recent Agent Memory papers to the Framework & Methods section:

1. NapMem (2026-07-07)

• Title: From Passive Retrieval to Active Memory Navigation: Learning to Use Memory as a Structured Action Space
• Authors: Yue Xu et al. (Alibaba)
• arXiv: 2607.05794
• Contribution: Treats long-term user memory as a structured action space. Organizes user history into a linked multi-granularity memory pyramid and trains agents via memory-tool RL to actively navigate memory.

2. Remember When It Matters (2026-07-09)

• Title: Remember When It Matters: Proactive Memory Agent for Long-Horizon Agents
• Authors: Yifan Wu et al. (Meta AI)
• arXiv: 2607.08716
• Contribution: Introduces the concept of behavioral state decay and studies memory as an active intervention mechanism rather than passive retrieval. A plug-and-play memory agent runs alongside action agents, improving pass@1 by +8.3 pp on Terminal-Bench 2.0.

Changes

• Add 2 paper entries (English) to README.md under Framework & Methods
• Add 2 paper entries (Chinese) to README_cn.md under 方法类与框架类
• Add news entries to both README files for 2026-07-28

Test plan

• Inserted in Framework & Methods section in reverse chronological order (2026-07-09, 2026-07-07, 2026-07-02)
• Added entries to README.md
• Added entries to README_cn.md
• Added news entries in both files
• HTML table format follows existing convention
• Tag badges follow existing color scheme