REVIEW.md

Maintainer run-through — da-eda

Date: 2026-09-12
Reviewed with: mechanical verification (this course ships no teaching contract beyond guided mode)
python verify.py starter --expect-failure: reproduces the intended unfinished state — all twelve contract tests fail on NotImplementedError.
python verify.py solution: all twelve tests pass.
python verify.py progress: deterministic claim codes; L03/L04 objective, L01/L02/L05 attested.
Agent solvability run (challenge-model gate): done 2026-09-13. Agent: Devin (SWE-2 Max), CLI session on macOS arm64, repo venv with pandas. Method: implemented starter/eda.py from TASK.md only — drop_duplicates, to_numeric/to_datetime with errors="coerce", groupby sums, merged stats into results.json — did not read or copy solution/. Result: python verify.py starter exits 0 (all twelve tests); verify.py progress printed all five claim codes. Deviations: none — solvable in one pass; cleaning order (dedupe before counting bad parses) matters and the contract pins the expected counts, which disambiguates it. Limitations: single run, single agent; results.json was written into scenario/shop-export/ per the contract (already git-ignored/shipped — verify by git status staying clean). Starter restored to the deliberately-unfinished state after the run.