Function score_commit 

pub fn score_commit(
    root: &Path,
    spec: &str,
    options: &Options,
) -> Result<JitReport, Error>

Available on crate feature vcs-git only.

Score a single commit for just-in-time defect-induction risk (issue #331).

spec is any revision spelling the backend resolves to a commit (HEAD, a SHA, a tag, main~3, …). The commit is scored against its first parent; the touched files’ priors and the author’s experience are measured from the history before it, windowed by options. Returns a JitReport with the feature breakdown, per-group contributions, and the ordinal composite JitReport::risk_score.

Errors

Returns Error::NotARepository when root is not inside a supported VCS working tree, Error::ResolveRef when spec does not resolve to a commit, or a walk/diff variant when the history walk itself fails.