Rewrite README.md in English and add README_CN.md in Chinese with
language switcher links. Updated to cover all recent features:
worktree isolation, skill auto-detection, dynamic agents, per-backend
config, allowed/disallowed tools, stderr noise filtering, cross-platform
support, and modular internal/ project structure.
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Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>