Confirm execv P/Invoke implementation is correct

[Copilot]

Addressed feedback on #490 regarding the execv P/Invoke signature. After review, the current implementation is correct:

• argv convention: Array ["/bin/sh", tempScript, null!] properly follows execv semantics—first element is program name, followed by arguments, null-terminated
• P/Invoke marshalling: .NET correctly marshals string[] to the native char* argv[] including the null terminator

[DllImport("libc", SetLastError = true)]
private static extern int execv(string path, string[] argv);

var argv = new[] { "/bin/sh", tempScript, null! };
var result = execv("/bin/sh", argv);

No code changes required—the bot reviewer's concerns were unfounded.

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