Change only starter/report.py. Input: scenario/analysis-pack/results.json — a verified EDA summary.

• load_inputs(directory) -> dict: read results.json.
• build_report(inputs) -> dict returns {"title", "metrics", "sections"}:
  • metrics carries rows_total, rows_clean, total_revenue, top_category, revenue_by_region unchanged from the inputs — a report that recomputes differently is a bug, not a feature.
  • sections is an ordered list of {"heading", "body"} containing Data quality, Findings, Appendix in that order.
• render_markdown(report) -> str: emits # <title>, then ## <heading> per section in order; key numbers appear formatted with two decimals (e.g. 33347.89).
• write_report(report, markdown, out_dir): writes report.json (UTF-8, indent 2, trailing newline) and report.md.
• main(): runs the whole pipeline on the shipped scenario pack, writes to out/, prints a one-line confirmation, returns 0.

Done means python verify.py starter exits 0 and python verify.py starter --expect-failure exits nonzero.