envseal 0.3.9

Write-only secret vault with process-level access control — post-agent secret management
Documentation 
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//! Invariant: std::io::Error converts to Error::StorageIo via From.
use envseal::error::Error;

#[test]
fn from_io_error() {
    let io_err = std::io::Error::new(std::io::ErrorKind::PermissionDenied, "permission denied");
    let err: Error = io_err.into();
    assert!(matches!(err, Error::StorageIo(_)));
    let msg = err.to_string();
    assert!(
        msg.contains("permission denied"),
        "Fix: StorageIo display must include the underlying message"
    );
}