docs: add Chinese (zh-CN) translations for README, AGENTS, and CLA

[jetsonearth]

Summary

• Add README.zh-CN.md, AGENTS.zh-CN.md, CLA.zh-CN.md with full Simplified Chinese translations
• Add language switcher (English | 中文) to the top of existing English README.md, AGENTS.md, and CLA.md
• Follows the *.zh-CN.md convention used by major open-source projects (Vue, Electron, etc.), making it easy for the community to contribute additional languages (ja, ko, es, de, etc.)

Test plan

• Verify Chinese README renders correctly on GitHub
• Verify language switcher links work in both directions (English ↔ 中文)
• Spot-check translation accuracy for technical terminology

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR adds Simplified Chinese (zh-CN) translations for README.md, AGENTS.md, and CLA.md, along with bidirectional language switchers (English | 中文) at the top of each file. The translations are thorough and technically accurate, faithfully preserving code blocks, badges, HTML tables, and asset references.

Key observations:

• All six bidirectional links (English ↔ 中文) are correctly cross-referenced.
• Code blocks, CLI commands, Python snippets, and file paths are correctly preserved (untranslated) throughout all three new files.
• The README.zh-CN.md language switcher is placed inside the existing <big><big> block, mirroring the English README's placement for visual consistency.
• One code example in AGENTS.zh-CN.md was modified from the English source: agent(system_prompt=G1_SYSTEM_PROMPT) was changed to McpClient.blueprint(system_prompt=G1_SYSTEM_PROMPT) — the English doc and actual codebase usage both use agent(...), so this translation should be corrected to match.

Confidence Score: 4/5

Safe to merge after fixing one code example that diverges from the English source and actual codebase usage.

Five of six changed files are clean. The single P1 finding is a code snippet in AGENTS.zh-CN.md that substitutes McpClient.blueprint(system_prompt=G1_SYSTEM_PROMPT) for the documented and implemented agent(system_prompt=G1_SYSTEM_PROMPT), which would give Chinese-speaking contributors incorrect guidance.

AGENTS.zh-CN.md line 280 — incorrect code example compared to English source.

Important Files Changed

Filename	Overview
AGENTS.zh-CN.md	Full Chinese translation of AGENTS.md; mostly accurate, but one code example was incorrectly changed from agent(system_prompt=...) to McpClient.blueprint(system_prompt=...), diverging from the English source and actual codebase usage.
AGENTS.md	Added a two-way language switcher (`English
CLA.md	Added language switcher at the very top; link target is correct.
CLA.zh-CN.md	Full Chinese translation of CLA.md; legal content faithfully translated; bidirectional link back to CLA.md is correct.
README.md	Added language switcher inside the existing <big><big> block; consistent with README.zh-CN.md placement; link target is correct.
README.zh-CN.md	Full 331-line Chinese translation of README.md; preserves all code blocks, badges, HTML tables, and asset links; language switcher placed symmetrically inside <big><big> block.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.md] <-->|Language Switcher| B[README.zh-CN.md]
    C[AGENTS.md] <-->|Language Switcher| D[AGENTS.zh-CN.md]
    E[CLA.md] <-->|Language Switcher| F[CLA.zh-CN.md]

    D -->|⚠️ Code example diverges| G["McpClient.blueprint(system_prompt=...)
    should be agent(system_prompt=...)"]

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