Sync Python port with detect-agent 1.2.0

[cursor]

Summary

• sync upstream agent-name changes for Claude Code, Codex CLI, Gemini CLI, and OpenCode
• add Kimi Code and Grok Build detection rules and shared upstream test cases
• expose matching Python constants and update supported-agent docs

Verification

• python3 -m pytest (54 passed)
• python3 -m ruff check .
• python3 -m ruff format --check .
• python3 -m mypy detect_agent
• vendored agents.json and testcases.json are byte-identical to upstream 3ab1df1

  

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