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Fix incorrect attribution of macOS Seatbelt to Anthropic in CodexSandboxExecutionPolicy docstring
Documentation-only bug in LangChain: the docstring for CodexSandboxExecutionPolicy incorrectly states that Seatbelt (macOS) is provided by Anthropic. In reality, Seatbelt is Apple's macOS sandbox facility and Codex CLI is OpenAI's tool. The proposed fix updates the phrase to accurately reflect the technology and vendor.