Method merge

crates/opencode-session/src/summary.rs:543–553

(a: &SessionSummaryData, b: &SessionSummaryData)

    }

    pub fn merge(a: &SessionSummaryData, b: &SessionSummaryData) -> SessionSummaryData {
        let mut diffs = a.diffs.clone();
        diffs.extend(b.diffs.clone());

        SessionSummaryData {
            additions: a.additions + b.additions,
            deletions: a.deletions + b.deletions,
            files: a.files + b.files,
            diffs,
        }
    }
}

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