Engineering workflow in one resumable DOSSIER.md: dependency-ordered tasks, invariants, drift detection, cross-repo state, a rolling status log, and scout + reviewer subagents.
Engineering-craft skills: red-green TDD, flaky-test audit, diagnosis, doubt review, grilling, merge-conflict resolution, research reports with grounded claims, HTML reports, skill linting and a column budget. Every gate among them carries a deterministic self-verify.