docs: apply translation-review findings across the four zh files

A four-way parallel review of every EN<->ZH pair (one reviewer per pair,
findings verified before applying) surfaced:

- terminology: stale-sense 过期 -> 陈旧 in development.zh.md (the table
  reserves 过期 for expired); GitHub workflow -> GitHub 工作流 per the
  table; dropped the invented 质量 in 'CI gates' -> CI 门禁; taxonomy ->
  分类体系 in translation-rules.zh.md; skill first-occurrence annotation
  added in the i18n README
- verbatim spans: <current-blob> restored inside an inline code span the
  translation had localized
- typography: full-width dashes normalized to no surrounding spaces
  across all four files (the rules' own MUST); one 顿号 between clauses
  -> comma; 顿号 before 以及 dropped
- fidelity/wording: must-not rendered 不得 (not 不应); local setup ->
  本地环境搭建; enforce -> 强制执行; verified surface -> 受验证的范围;
  batch-lands-before-neighbors nuance restored; 更新粘贴内容

README.zh.md

@@ -21,6 +21,6 @@ pnpm run demo:echo     # runnable echo-agent example (no API key needed)
 pnpm run demo:coding   # the real DeepSeek coding agent (needs DEEPSEEK_API_KEY)
 ```
 
-面向人类读者：先读[开发指南](docs/development.md)了解本地环境、钩子、环境变量与质量门禁，动手改 package 之前再读[架构设计](docs/architecture.md)。局部上下文见 [packages/](packages/) 与 [vendor/](vendor/)。
+面向人类读者：先读[开发指南](docs/development.md)了解本地环境搭建、钩子、环境变量与质量门禁，动手改 package 之前再读[架构设计](docs/architecture.md)。局部上下文见 [packages/](packages/) 与 [vendor/](vendor/)。
 
 面向 agent：遵循 [AGENTS.md](AGENTS.md)。