- Rename 0004-crdt-based-layout-system.md to 0003-crdt-based-layout-system.md
- Update title from "4. Centralized..." to "3. Centralized..."
- Add ADR 0003 entry to docs/adr/README.md index table
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>