v0.7.0

What's Changed

• feat: 接入 BigModel provider by @kuliantnt in #37
• [codex] 修复知识库 frontmatter 检索污染 by @kuliantnt in #38
• [codex] 修复群聊 pending 发起人校验 by @kuliantnt in #39
• fix: 明确待办删除终态语义 by @kuliantnt in #40
• [codex] 更新 README Rust 行数描述 by @kuliantnt in #42
• feat: 长期记忆增加个人/群聊作用域，修复跨用户记忆泄露 by @kuliantnt in #41

Full Changelog: v0.6.2...v0.7.0