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Maintainer run-through — da-visualization

  • Date: 2026-09-12
  • python verify.py starter --expect-failure: reproduces the intended unfinished state — all five contract tests fail.
  • python verify.py solution: all five tests pass; three valid PNGs and summary.json written to out/.
  • 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 + matplotlib. Method: implemented starter/charts.py from TASK.md only (Agg backend, groupby sums, three fig.savefig + summary.json), did not read or copy solution/. Result: python verify.py starter exits 0; verify.py progress printed all five claim codes (l03/l04 [passed]). Deviations: none — solvable in one pass; the only trap is forgetting matplotlib.use("Agg") before pyplot import, which TASK.md states plainly. Limitations: single run; the suite checks PNG validity and JSON numbers, not chart quality — consistent with the L05 "what verification cannot see" lesson. Starter restored to the deliberately-unfinished state after the run.