appcore-update 1.0.0

Application artifact update and rollback lifecycle for AppCore Runtime
Documentation 
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// =============================================================================
//        #######
//     ###       ###     F: integrity.rs
//    ##   ## ##   ##    P: AppCore-Runtime
//         ## ##
//                       C: 2026/07/22 15:41:18 by dnettoRaw
//    ##   ## ##   ##    U: 2026/07/22 15:41:18 by dnettoRaw
//      ###########      S: 1.0.1-rc.8
// =============================================================================

use sha2::{Digest, Sha256};

pub(crate) fn sha256_hex(bytes: &[u8]) -> String {
    let digest = Sha256::digest(bytes);
    let mut output = String::with_capacity(64);
    const HEX: &[u8; 16] = b"0123456789abcdef";
    for byte in digest {
        output.push(HEX[(byte >> 4) as usize] as char);
        output.push(HEX[(byte & 0x0f) as usize] as char);
    }
    output
}