Lab: your harness improves itself

Build lab (Module 12, L12.6), interview checkpoint. Baseline 3/5. One cycle adds parse (delta new +2, delta old +0, COMMIT). The next revokes a task (delta new -1, delta old +0, ROLLBACK) and keeps the artifact. Final score stays 5/5. A 3-tool bundle is REFUSED. A 0/0 tie commits under both deltas non-negative. In-memory only; no model.

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