Function build_duplication_codeclimate 

pub fn build_duplication_codeclimate(
    report: &DuplicationReport,
    root: &Path,
) -> Vec<CodeClimateIssue>

Build CodeClimate issues from duplication analysis results.

fallow-output owns the CodeClimate wire DTOs. This API layer combines those DTOs with the engine-owned duplication report so CLI and future embedders can share the same issue construction policy.