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- #9: standardize the test chain on stdlib unittest (nothing-to-install, which keeps M13's claims true and its planted bug intact). Aligned M5/M14/M16 prose, M14 lab/test_tasks.py, and ci/gitlab starters; ruff stays the only pip install. - #20: add venv / PEP 668 / which-python guidance to M20 (+ M14/M15 local installs); point MCP config at the venv's absolute python. - #21: replace M21 Part D's empty `git diff HEAD~1` with `git log -p` (no .gitignore added — device preserved). - #22: add a dependency-install step before M23's green baseline on a fresh clone. - #23: M24 reviewer/triage now tolerate code-fence-wrapped JSON (stdlib only); feature.patch trap untouched. - #28: fix M27 Part D CI snippet path (working-directory) and require the gate to target a varying candidate; swapped_model regression kept as the fixture. Closes #9 Closes #20 Closes #21 Closes #22 Closes #23 Closes #28 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT