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Add security disclaimer to README #35

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`replr` provides a robust system for executing R code in isolated worker processes, offering complete separation between the main R session and code execution environments. Useful for applications that need to run untrusted or potentially problematic R code without affecting the parent process.

## ⚠️ Security Disclaimer

**IMPORTANT:** While `replr` provides various isolation mechanisms (process isolation, Docker containers, Firejail sandboxes, macOS sandboxes) to help contain untrusted code execution, **no security solution is 100% foolproof**. These isolation methods can reduce risk but cannot guarantee complete protection against all attack vectors.

**You are solely responsible for any consequences of running malicious or untrusted code.** The maintainers of this package accept no liability for damages, data loss, security breaches, or other issues arising from the execution of code in isolated environments.

Always exercise caution when executing untrusted code, even in isolated environments. Consider additional security measures appropriate for your use case and threat model.

## Installation

You can install the development version of replr like this:
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