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Brainstorm 2026-06-04: K4 artifact-write narrow exemption; 5 sub-plans (3-A..3-E); router-discipline levers A-G; 3-layer=triage+delegate-to-real-nodes; skill-imitation closure (234/236); criterion-not-verified judge rule (K5, loud block for Machine 4). All 6 review findings closed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>