Function parse_push_trailer

atomic-cli/src/commands/git/parallel.rs:4223–4250

Parse `atomic git push` trailers from a commit message. Only matches when the trailers form the message's final paragraph — the shape `atomic git push` itself produces. Trailer lines embedded mid-body (e.g. a GitHub squash-merge message quoting the original commit) do NOT match: those commits may carry conflict resolutions and must be imported.

(message: &str)

/// (e.g. a GitHub squash-merge message quoting the original commit) do NOT
/// match: those commits may carry conflict resolutions and must be imported.
fn parse_push_trailer(message: &str) -> Option<PushTrailer> {
    let last_paragraph = message.trim_end().rsplit("\n\n").next()?;

    let mut view = None;
    let mut state = None;
    for line in last_paragraph.lines() {
        let line = line.trim();
        if let Some(value) = line.strip_prefix("Atomic-View:") {
            view = Some(value.trim().to_string());
        } else if let Some(value) = line.strip_prefix("Atomic-State:") {
            state = Merkle::from_base32(value.trim().as_bytes());
        } else if line.starts_with("Atomic-Changes:") {
            // Optional trailer; not needed for self-push detection (we only
            // care about view + state here). The authoritative collection of
            // these hashes for ReviewGate provenance happens in
            // `parse_atomic_changes_trailer`, which scans the whole message.
        } else {
            // Non-trailer content in the final paragraph — not a commit
            // produced by `atomic git push`.
            return None;
        }
    }

    Some(PushTrailer {
        view: view?,
        state: state?,
    })
}

/// Extract metadata from a git commit.
fn extract_commit_metadata(commit: &git2::Commit) -> CliResult<CommitMetadata> {