Add pbakaus/impeccable (v4.1.1, 23 design commands, 59 deterministic anti-slop rules) to the frontend workflow and READMEs. Document the QA harness measurements in both READMEs: before/after workflow scores on the same ruler (total +98.6%), the four green gates, the meta-tests, and what the refinement added. Full snapshot history is in qa/snapshots/.