docs(readme): align the tagline with the repository description

README.md

@@ -44,7 +44,7 @@
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 <p align="center"><strong>Open source · MIT · a single Go binary</strong></p>
-<h3 align="center">A coding agent you can leave running.</h3>
+<h3 align="center">A reliable coding agent for complex software engineering tasks.</h3>
 <p align="center">One local engine, four ways in — terminal, desktop app, browser, or your editor over ACP. Plan mode, permissions, a workspace sandbox and per-turn checkpoints keep a long autonomous run something you can still read and undo.</p>
 <p align="center">Maintained by <strong>Huahui Yu</strong>.</p>
 

README.zh-CN.md

@@ -44,7 +44,7 @@
 <br/>
 
 <p align="center"><strong>开源 · MIT · 单个 Go 二进制</strong></p>
-<h3 align="center">可以一直开着跑的编码 Agent。</h3>
+<h3 align="center">面向复杂软件工程任务的可靠编码 Agent。</h3>
 <p align="center">一套本地引擎,四个入口——终端、桌面端、浏览器,或通过 ACP 接入你的编辑器。计划模式、权限、工作区沙箱与逐轮 checkpoint,让长时间自治运行始终可读、可撤销。</p>
 <p align="center">维护者：<strong>Huahui Yu</strong>。</p>