docs: bilingual docs contract, translation skill, and pairing gate

Establish EN->ZH bilingual documentation for the README and docs tree:

- docs/i18n/README.md — the pairing contract: sibling foo.md <-> foo.zh.md,
  English canonical, blob-hash source fingerprints, language switchers,
  scope/exclusions, and a manifest-driven rollout ratchet.
- docs/i18n/translation-rules.md — how to translate: faithfulness, structure
  preservation, terminology discipline over docs/i18n/terminology.md, and
  typography rules grounded in MDN/K8s/Vue/clreq conventions.
- .agents/skills/dsh-translate-docs — the committed agent workflow, following
  the dsh-code-review pattern of deferring to docs as sources of truth.
- scripts/verify-translation-pairing.ts + manifest — a doc-sync gate: required
  pairs exist; every existing .zh.md is fresh (fingerprint = current source
  blob), switcher-linked, structure-matched, and non-orphaned; excluded
  (generated) docs stay unpaired. --list prints the translation work list.
- RFC (implemented/process) recording the decision and the alternatives.
- Dogfood: README.zh.md and the two i18n docs translated under their own rules.

Gates: doc-sync green including the new gate; red/green proven for stale
fingerprint, orphan, and excluded-file violations.

README.zh.md

@@ -0,0 +1,26 @@
+<!-- i18n-source: README.md@33c03fad1450 -->
+
+# DeepSeek Harness
+
+[English](README.md) | 中文
+
+DeepSeek Harness 小组的 monorepo。
+
+## 项目
+
+- **DeepSeek Code** — DeepSeek 的编码 agent（智能体）产品。
+
+## 开发
+
+本 monorepo 基于 [Cordis](https://github.com/cordiverse/cordis) 框架构建（以源码形式收录在 `vendor/` 下），采用微内核风格：一切皆插件。
+
+```sh
+pnpm install
+pnpm run test          # vitest
+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 agent：遵循 [AGENTS.md](AGENTS.md)。