- Auto Layout preserves manually placed entities (manualPosition flag
  threaded through schemaAdapter; locked vs unlocked split in ELK)
- Column rename cascades to FK refs on sibling entities, candidate_keys,
  business_keys, grain, hash_diff_fields, partition_by, cluster_by, and
  single-value keys
- 'C' keyboard shortcut recenters the canvas on the selected entity
- Diagram sticky notes persist to .diagram.yaml via new notes[] schema
  and yamlPatch helpers (add/patch/delete)