Shared helpers used across crates.
- -
```rust
use std::path::Path;
use wrkflw_utils::{is_workflow_file, fd::with_stderr_to_null};
assert!(is_workflow_file(Path::new(".github/workflows/ci.yml")));
let value = with_stderr_to_null(|| {
}).unwrap();
assert_eq!(value, 42);
```