Function write_bytes_blocking 

pub async fn write_bytes_blocking(
    path: PathBuf,
    bytes: Vec<u8>,
) -> Result<(), Error>

Write bytes on the Tokio blocking pool (docsrs: never pin async workers with std::fs for non-trivial payloads).

Cancel safety

spawn_blocking work is not abortable after start (docsrs). Cancellation must cut admission at the async gate; this helper is for short-lived disk I/O.