README: English-first facade (README.md en + README.zh-CN.md zh)

[askclaw-lumen]

Copy of getaskclaw/amber#4 template applied to this repo:

• README.md := previous README.en.md verbatim (promoted, no new translation), with a top language switcher line
• README.zh-CN.md := previous README.md verbatim (kept, no re-translation), with a top language switcher line
• README.en.md untouched (docs/ links to it stay valid)
• stale cross-language link to README.en.md / 中文 README en-facing equivalent dropped (both sides), matching the spec-repo PR#4 diff
• scores / issue tables / images / results untouched

Diff-limited to exactly README.md + README.zh-CN.md.

[adaptcom]

Confidence Score: 4/5

Summary

Promotes README.en.md to README.md and moves the Chinese page to README.zh-CN.md, verified verbatim apart from the switcher line and one dropped cross-link each; relative links resolve. Low risk, docs only.

Important Files Changed

File	Overview
README.md	Now English (verbatim README.en.md) plus switcher; stale 中文 self-link dropped
README.zh-CN.md	New file: previous Chinese README verbatim plus switcher line

Findings

• README.en.md line 10 still labels README.md as 中文, which is now English; repoint it to README.zh-CN.md or stub README.en.md in a follow-up.
• README.md and README.en.md are now identical copies; weekly updates must edit both until README.en.md becomes a redirect stub.

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