Molecules are the LEDGER, not a task checklist. Each step closure is a timestamped CV entry. Batch-closing corrupts the timeline. Added explicit warnings to: - molecules.md (first best practice) - polecat-CLAUDE.md (new 🚨 section) The discipline: mark in_progress BEFORE starting, closed IMMEDIATELY after completing. Never batch-close at the end. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>