Function build_change_set_report 

pub fn build_change_set_report<R: Repo>(
    db: &FactsDb,
    repo: &R,
    opts: &Options,
    cache_root: &Path,
) -> Result<ChangeSetReport>

Build the full change-set report for the current working tree vs HEAD.

Enumerates the tracked changes itself via crate::Repo::worktree_changes, then runs the health projection, the cycle splice, and the coupling-absence scan, and assembles the advisory findings. The whole report is memoised in a content-keyed JSON sidecar under cache_root: a hit is returned as-is except for merge_in_progress, which is recomputed because it is repo state rather than measured content. Thresholds and calibration are deliberately NOT part of the cache key — the report stores measured data only, and consumers re-evaluate verdicts on every read.

Errors

Propagates repo errors (including the unmerged-paths refusal from worktree_changes), fact-store / SQL errors as CodeLoreError::Analysis, and working-tree read failures.