Function parse_atomic_changes_trailer

atomic-cli/src/commands/git/parallel.rs:3957–3974

Parse **every** `Atomic-Changes:` trailer in a commit message. A GitHub (or GitLab/Azure) squash-merge concatenates the bodies of all squashed commits, so a single squash commit legitimately carries multiple** `Atomic-Changes:` blocks — one per materialization commit. We accumulate hashes across every block, de-duplicated with first-seen order preserved, so the ReviewGate links back to the *full*

(message: &str)

/// [`split_atomic_changes_value`] splitter but must keep these distinct
/// notions of which trailers are relevant.
fn parse_atomic_changes_trailer(message: &str) -> Option<Vec<String>> {
    let mut all: Vec<String> = Vec::new();
    for line in message.lines() {
        let line = line.trim();
        if let Some(rest) = line.strip_prefix("Atomic-Changes:") {
            for hash in split_atomic_changes_value(rest) {
                if !all.contains(&hash) {
                    all.push(hash);
                }
            }
        }
    }
    if all.is_empty() {
        None
    } else {
        Some(all)
    }
}

/// Parse a PR/MR number from a commit message.
///