piz: eldre versjoner og versjonshistorikk

Full Changelog: https://github.com/AriesOxO/piz/compare/v0.3.3...v0.3.4

Full Changelog: https://github.com/AriesOxO/piz/compare/v0.3.2...v0.3.3

Improved / 优化
- Introduced ExecContext and ChatConfig structs to eliminate #[allow(clippy::too_many_arguments)] in handle_command_with_autofix and run_chat
- 引入 ExecContext 和 ChatConfig 结构体，消除 handle_command_with_autofix 和 run_chat 的过多参数警告
- Extracted truncate_history() as a standalone testable function with 7 unit tests for history truncation logic
- 将 truncate_history() 提取为独立可测试函数，新增 7 个历史截断逻辑单元测试
- Added 9 shell script syntax validation tests for shell_init.rs (brace balance, path slashes, eval file cleanup, subcommand passthrough)
- 为 shell_init.rs 新增 9 个脚本语法验证测试（括号平衡、路径斜杠方向、eval 文件清理、子命令透传）
- Replaced silent unwrap_or_default() with logged error for explanation fetch failures
- 将解释获取的静默 unwrap_or_default() 替换为带日志的错误处理
- Added SAFETY comments to both unsafe blocks (Windows VT100 console setup, GBK decoding)
- 为两处 unsafe 块添加 SAFETY 注释（Windows VT100 控制台设置、GBK 解码）
- Replaced panic! with unreachable! in CLI test assertions for better semantics
- 测试中的 panic! 替换为语义更精确的 unreachable!
- Added pre-push checklist to CLAUDE.md enforcing cargo fmt, cargo clippy, cargo test before push
- 在 CLAUDE.md 中添加推送前必须执行的检查规范
- Updated documentation: test counts (190→437), added /detail to chat commands, added missing test files to architecture diagram
- 更新文档：测试数量（190→437）、聊天模式补充 /detail 命令、架构图补充测试文件
- Total tests: 437 (344 unit + 45 integration + 48 windows shell)
- 测试总数：437（344 单元 + 45 集成 + 48 环境）
Full Changelog: https://github.com/AriesOxO/piz/compare/v0.3.1...v0.3.2