speccoder-openspec 0.4.0

OpenSpec adapter for speccoder: change discovery, tasks.md and spec delta parsing, preflight.
Documentation 
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//! Content hashes for the tick and append guards.

use sha2::{Digest, Sha256};

/// Lowercase hex SHA-256 of `bytes`.
#[must_use]
pub fn sha256_hex(bytes: &[u8]) -> String {
    Sha256::digest(bytes)
        .iter()
        .map(|b| format!("{b:02x}"))
        .collect()
}