Function parse_version_output

src/upgrade.rs:764–767

Extracts the version from `tracedecay --version` output (e.g. `tracedecay 5.0.1` → `5.0.1`).

(output: &str)

/// Extracts the version from `tracedecay --version` output
/// (e.g. `tracedecay 5.0.1` → `5.0.1`).
fn parse_version_output(output: &str) -> Option<String> {
    let version = output.split_whitespace().last()?;
    Some(version.trim_start_matches('v').to_string())
}

/// Asks the binary at `path` for its version, killing it after a short
/// deadline so a wedged binary cannot hang the upgrade. `None` when it